\u4e00\u3001\u7d22\u5f15\u7684\u7c7b\u578b\uff1a<\/p>\n
PostgreSQL\u63d0\u4f9b\u4e86\u591a\u3000\u3000\u79cd\u7d22\u5f15\u7c7b\u578b\uff1aB-Tree\u3001Hash\u3001GiST\u548cGIN\uff0c\u7531\u4e8e\u5b83\u4eec\u4f7f\u7528\u4e86\u4e0d\u540c\u7684\u7b97\u6cd5\uff0c\u56e0\u6b64\u6bcf\u79cd\u7d22\u5f15\u7c7b\u578b\u90fd\u6709\u5176\u9002\u5408\u7684\u67e5\u8be2\u7c7b\u578b\uff0c\u7f3a\u7701\u65f6\uff0cCREATE INDEX\u547d\u4ee4\u5c06\u521b\u5efaB-Tree\u7d22\u5f15\u3002\n\n1. B-Tree:\nCREATE TABLE test1 (\n id integer,\n content varchar\n);\nCREATE INDEX test1_id_index ON test1 (id); \nB-Tree\u7d22\u5f15\u4e3b\u8981\u7528\u4e8e\u7b49\u4e8e\u548c\u8303\u56f4\u67e5\u8be2\uff0c\u7279\u522b\u662f\u5f53\u7d22\u5f15\u5217\u5305\u542b\u64cd\u4f5c\u7b26\" <\u3001<=\u3001=\u3001>=\u548c>\"\u4f5c\u4e3a\u67e5\u8be2\u6761\u4ef6\u65f6\uff0cPostgreSQL\u7684\u67e5\u8be2\u89c4\u5212\u5668\u90fd\u4f1a\u8003\u8651\u4f7f\u7528B-Tree\u7d22\u5f15\u3002\u5728\u4f7f\u7528BETWEEN\u3001IN\u3001IS NULL\u548cIS NOT NULL\u7684\u67e5\u8be2\u4e2d\uff0cPostgreSQL\u4e5f\u53ef\u4ee5\u4f7f\u7528B-Tree\u7d22\u5f15\u3002\u7136\u800c\u5bf9\u4e8e\u57fa\u4e8e\u6a21\u5f0f\u5339\u914d\u64cd\u4f5c\u7b26\u7684\u67e5\u8be2\uff0c\u5982LIKE\u3001ILIKE\u3001~\u548c ~*\uff0c\u4ec5\u5f53\u6a21\u5f0f\u5b58\u5728\u4e00\u4e2a\u5e38\u91cf\uff0c\u4e14\u8be5\u5e38\u91cf\u4f4d\u4e8e\u6a21\u5f0f\u5b57\u7b26\u4e32\u7684\u5f00\u5934\u65f6\uff0c\u5982col LIKE 'foo%'\u6216col ~ '^foo'\uff0c\u7d22\u5f15\u624d\u4f1a\u751f\u6548\uff0c\u5426\u5219\u5c06\u4f1a\u6267\u884c\u5168\u8868\u626b\u63cf\uff0c\u5982\uff1acol LIKE '%bar'\u3002 \n\n2. Hash\uff1a\nCREATE INDEX name ON table USING hash (column);\n\u6563\u5217(Hash)\u7d22\u5f15\u53ea\u80fd\u5904\u7406\u7b80\u5355\u7684\u7b49\u4e8e\u6bd4\u8f83\u3002\u5f53\u7d22\u5f15\u5217\u4f7f\u7528\u7b49\u4e8e\u64cd\u4f5c\u7b26\u8fdb\u884c\u6bd4\u8f83\u65f6\uff0c\u67e5\u8be2\u89c4\u5212\u5668\u4f1a\u8003\u8651\u4f7f\u7528\u6563\u5217\u7d22\u5f15\u3002\n\u8fd9\u91cc\u9700\u8981\u989d\u5916\u8bf4\u660e\u7684\u662f\uff0cPostgreSQL\u6563\u5217\u7d22\u5f15\u7684\u6027\u80fd\u4e0d\u6bd4B-Tree\u7d22\u5f15\u5f3a\uff0c\u4f46\u662f\u6563\u5217\u7d22\u5f15\u7684\u5c3a\u5bf8\u548c\u6784\u9020\u65f6\u95f4\u5219\u66f4\u5dee\u3002\u53e6\u5916\uff0c\u7531\u4e8e\u6563\u5217\u7d22\u5f15\u64cd\u4f5c\u76ee\u524d\u6ca1\u6709\u8bb0\u5f55WAL\u65e5\u5fd7\uff0c\u56e0\u6b64\u4e00\u65e6\u53d1\u751f\u4e86\u6570\u636e\u5e93\u5d29\u6e83\uff0c\u6211\u4eec\u5c06\u4e0d\u5f97\u4e0d\u7528REINDEX\u91cd\u5efa\u6563\u5217\u7d22\u5f15\u3002\n\n3. GiST\uff1a\nGiST\u7d22\u5f15\u4e0d\u662f\u4e00\u79cd\u5355\u72ec\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u800c\u662f\u4e00\u79cd\u67b6\u6784\uff0c\u53ef\u4ee5\u5728\u8be5\u67b6\u6784\u4e0a\u5b9e\u73b0\u5f88\u591a\u4e0d\u540c\u7684\u7d22\u5f15\u7b56\u7565\u3002\u4ece\u800c\u53ef\u4ee5\u4f7fGiST\u7d22\u5f15\u6839\u636e\u4e0d\u540c\u7684\u7d22\u5f15\u7b56\u7565\uff0c\u800c\u4f7f\u7528\u7279\u5b9a\u7684\u64cd\u4f5c\u7b26\u7c7b\u578b\u3002 \n\n4. GIN\uff1a\nGIN\u7d22\u5f15\u662f\u53cd\u8f6c\u7d22\u5f15\uff0c\u5b83\u53ef\u4ee5\u5904\u7406\u5305\u542b\u591a\u4e2a\u952e\u7684\u503c(\u6bd4\u5982\u6570\u7ec4)\u3002\u4e0eGiST\u7c7b\u4f3c\uff0cGIN\u540c\u6837\u652f\u6301\u7528\u6237\u5b9a\u4e49\u7684\u7d22\u5f15\u7b56\u7565\uff0c\u4ece\u800c\u53ef\u4ee5\u4f7fGIN\u7d22\u5f15\u6839\u636e\u4e0d\u540c\u7684\u7d22\u5f15\u7b56\u7565\uff0c\u800c\u4f7f\u7528\u7279\u5b9a\u7684\u64cd\u4f5c\u7b26\u7c7b\u578b\u3002\u4f5c\u4e3a\u793a\u4f8b\uff0cPostgreSQL\u7684\u6807\u51c6\u53d1\u5e03\u4e2d\u5305\u542b\u4e86\u7528\u4e8e\u4e00\u7ef4\u6570\u7ec4\u7684GIN\u64cd\u4f5c\u7b26\u7c7b\u578b\uff0c\u5982\uff1a<@\u3001@>\u3001=\u3001&&\u7b49\u3002<\/code><\/pre>\n\u4e8c\u3001\u590d\u5408\u7d22\u5f15\uff1a<\/p>\n
PostgreSQL\u4e2d\u7684\u7d22\u5f15\u53ef\u4ee5\u5b9a\u4e49\u5728\u6570\u636e\u8868\u7684\u591a\u4e2a\u5b57\u6bb5\u4e0a\uff0c\u5982\uff1a\nCREATE TABLE test2 (\n major int,\n minor int,\n name varchar\n}\nCREATE INDEX test2_mm_idx ON test2 (major, minor);\n\u5728\u5f53\u524d\u7684\u7248\u672c\u4e2d\uff0c\u53ea\u6709B-tree\u3001GiST\u548cGIN\u652f\u6301\u590d\u5408\u7d22\u5f15\uff0c\u5176\u4e2d\u6700\u591a\u53ef\u4ee5\u58f0\u660e32\u4e2a\u5b57\u6bb5\u3002\n1. B-Tree\u7c7b\u578b\u7684\u590d\u5408\u7d22\u5f15\uff1a\n\u5728B-Tree\u7c7b\u578b\u7684\u590d\u5408\u7d22\u5f15\u4e2d\uff0c\u8be5\u7d22\u5f15\u5b57\u6bb5\u7684\u4efb\u610f\u5b50\u96c6\u5747\u53ef\u7528\u4e8e\u67e5\u8be2\u6761\u4ef6\uff0c\u4e0d\u8fc7\uff0c\u53ea\u6709\u5f53\u590d\u5408\u7d22\u5f15\u4e2d\u7684\u7b2c\u4e00\u4e2a\u7d22\u5f15\u5b57\u6bb5(\u6700\u5de6\u8fb9)\u88ab\u5305\u542b\u5176\u4e2d\u65f6\uff0c\u624d\u53ef\u4ee5\u83b7\u5f97\u6700\u9ad8\u6548\u7387\u3002\n\n2. GiST\u7c7b\u578b\u7684\u590d\u5408\u7d22\u5f15\uff1a\n\u5728GiST\u7c7b\u578b\u7684\u590d\u5408\u7d22\u5f15\u4e2d\uff0c\u53ea\u6709\u5f53\u7b2c\u4e00\u4e2a\u7d22\u5f15\u5b57\u6bb5\u88ab\u5305\u542b\u5728\u67e5\u8be2\u6761\u4ef6\u4e2d\u65f6\uff0c\u624d\u80fd\u51b3\u5b9a\u8be5\u67e5\u8be2\u4f1a\u626b\u63cf\u591a\u5c11\u7d22\u5f15\u6570\u636e\uff0c\u800c\u5176\u4ed6\u7d22\u5f15\u5b57\u6bb5\u4e0a\u7684\u6761\u4ef6\u53ea\u662f\u4f1a\u9650\u5236\u7d22\u5f15\u8fd4\u56de\u7684\u6761\u76ee\u3002\u5047\u5982\u7b2c\u4e00\u4e2a\u7d22\u5f15\u5b57\u6bb5\u4e0a\u7684\u5927\u591a\u6570\u6570\u636e\u90fd\u6709\u76f8\u540c\u7684\u952e\u503c\uff0c\u90a3\u4e48\u6b64\u65f6\u5e94\u7528GiST\u7d22\u5f15\u5c31\u4f1a\u6bd4\u8f83\u4f4e\u6548\u3002 \n\n3. GIN\u7c7b\u578b\u7684\u590d\u5408\u7d22\u5f15\uff1a\n\u4e0eB-Tree\u548cGiST\u7d22\u5f15\u4e0d\u540c\u7684\u662f\uff0cGIN\u590d\u5408\u7d22\u5f15\u4e0d\u4f1a\u53d7\u5230\u67e5\u8be2\u6761\u4ef6\u4e2d\u4f7f\u7528\u4e86\u54ea\u4e9b\u7d22\u5f15\u5b57\u6bb5\u5b50\u96c6\u7684\u5f71\u54cd\uff0c\u65e0\u8bba\u662f\u54ea\u79cd\u7ec4\u5408\uff0c\u90fd\u4f1a\u5f97\u5230\u76f8\u540c\u7684\u6548\u7387\u3002\n\n\u4f7f\u7528\u590d\u5408\u7d22\u5f15\u5e94\u8be5\u8c28\u614e\u3002\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u5355\u4e00\u5b57\u6bb5\u4e0a\u7684\u7d22\u5f15\u5c31\u5df2\u7ecf\u8db3\u591f\u4e86\uff0c\u5e76\u4e14\u8fd8\u8282\u7ea6\u65f6\u95f4\u548c\u7a7a\u95f4\u3002\u9664\u975e\u8868\u7684\u4f7f\u7528\u6a21\u5f0f\u975e\u5e38\u56fa\u5b9a\uff0c\u5426\u5219\u8d85\u8fc7\u4e09\u4e2a\u5b57\u6bb5\u7684\u7d22\u5f15\u51e0\u4e4e\u6ca1\u4ec0\u4e48\u7528\u5904\u3002 <\/code><\/pre>\n\u4e09\u3001\u7ec4\u5408\u591a\u4e2a\u7d22\u5f15\uff1a<\/p>\n
PostgreSQL\u53ef\u4ee5\u5728\u67e5\u8be2\u65f6\u7ec4\u5408\u591a\u4e2a\u7d22\u5f15(\u5305\u62ec\u540c\u4e00\u7d22\u5f15\u7684\u591a\u6b21\u4f7f\u7528)\uff0c\u6765\u5904\u7406\u5355\u4e2a\u7d22\u5f15\u626b\u63cf\u4e0d\u80fd\u5b9e\u73b0\u7684\u573a\u5408\u3002\u4e0e\u6b64\u540c\u65f6\uff0c\u7cfb\u7edf\u8fd8\u53ef\u4ee5\u5728\u591a\u4e2a\u7d22\u5f15\u626b\u63cf\u4e4b\u95f4\u7ec4\u6210AND\u548cOR\u7684\u6761\u4ef6\u3002\u6bd4\u5982\uff0c\u4e00\u4e2a\u7c7b\u4f3cWHERE x = 42 OR x = 47 OR x = 53 OR x = 99\u7684\u67e5\u8be2\uff0c\u53ef\u4ee5\u88ab\u5206\u89e3\u6210\u56db\u4e2a\u72ec\u7acb\u7684\u57fa\u4e8ex\u5b57\u6bb5\u7d22\u5f15\u7684\u626b\u63cf\uff0c\u6bcf\u4e2a\u626b\u63cf\u4f7f\u7528\u4e00\u4e2a\u67e5\u8be2\u5b50\u53e5\uff0c\u4e4b\u540e\u518d\u5c06\u8fd9\u4e9b\u626b\u63cf\u7ed3\u679cOR\u5728\u4e00\u8d77\u5e76\u751f\u6210\u6700\u7ec8\u7684\u7ed3\u679c\u3002\u53e6\u5916\u4e00\u4e2a\u4f8b\u5b50\u662f\uff0c\u5982\u679c\u6211\u4eec\u5728x\u548cy\u4e0a\u5206\u522b\u5b58\u5728\u72ec\u7acb\u7684\u7d22\u5f15\uff0c\u90a3\u4e48\u4e00\u4e2a\u7c7b\u4f3cWHERE x = 5 AND y = 6\u7684\u67e5\u8be2\uff0c\u5c31\u4f1a\u5206\u522b\u57fa\u4e8e\u8fd9\u4e24\u4e2a\u5b57\u6bb5\u7684\u7d22\u5f15\u8fdb\u884c\u626b\u63cf\uff0c\u4e4b\u540e\u518d\u5c06\u5404\u81ea\u626b\u63cf\u7684\u7ed3\u679c\u8fdb\u884cAND\u64cd\u4f5c\u5e76\u751f\u6210\u6700\u7ec8\u7684\u7ed3\u679c\u884c\u3002\n\u4e3a\u4e86\u7ec4\u5408\u591a\u4e2a\u7d22\u5f15\uff0c\u7cfb\u7edf\u626b\u63cf\u6bcf\u4e2a\u9700\u8981\u7684\u7d22\u5f15\uff0c\u7136\u540e\u5728\u5185\u5b58\u91cc\u7ec4\u7ec7\u4e00\u4e2aBITMAP\uff0c\u5b83\u5c06\u7ed9\u51fa\u7d22\u5f15\u626b\u63cf\u51fa\u7684\u6570\u636e\u5728\u6570\u636e\u8868\u4e2d\u7684\u7269\u7406\u4f4d\u7f6e\u3002\u7136\u540e\uff0c\u518d\u6839\u636e\u67e5\u8be2\u7684\u9700\u8981\uff0c\u628a\u8fd9\u4e9b\u4f4d\u56fe\u8fdb\u884cAND\u6216\u8005OR\u7684\u64cd\u4f5c\u5e76\u5f97\u51fa\u6700\u7ec8\u7684BITMAP\u3002\u6700\u540e\uff0c\u68c0\u7d22\u6570\u636e\u8868\u5e76\u8fd4\u56de\u6570\u636e\u884c\u3002\u8868\u7684\u6570\u636e\u884c\u662f\u6309\u7167\u7269\u7406\u987a\u5e8f\u8fdb\u884c\u8bbf\u95ee\u7684\uff0c\u56e0\u4e3a\u8fd9\u662f\u4f4d\u56fe\u7684\u5e03\u5c40\uff0c\u8fd9\u5c31\u610f\u5473\u7740\u4efb\u4f55\u539f\u6765\u7684\u7d22\u5f15\u7684\u6392\u5e8f\u90fd\u5c06\u6d88\u5931\u3002\u5982\u679c\u67e5\u8be2\u4e2d\u6709ORDER BY\u5b50\u53e5\uff0c\u90a3\u4e48\u8fd8\u5c06\u4f1a\u6709\u4e00\u4e2a\u989d\u5916\u7684\u6392\u5e8f\u6b65\u9aa4\u3002\u56e0\u4e3a\u8fd9\u4e2a\u539f\u56e0\uff0c\u4ee5\u53ca\u6bcf\u4e2a\u989d\u5916\u7684\u7d22\u5f15\u626b\u63cf\u90fd\u4f1a\u589e\u52a0\u989d\u5916\u7684\u65f6\u95f4\uff0c\u8fd9\u6837\u89c4\u5212\u5668\u6709\u65f6\u5019\u5c31\u4f1a\u9009\u62e9\u4f7f\u7528\u7b80\u5355\u7684\u7d22\u5f15\u626b\u63cf\uff0c\u5373\u4f7f\u6709\u591a\u4e2a\u7d22\u5f15\u53ef\u7528\u4e5f\u4f1a\u5982\u6b64\u3002 <\/code><\/pre>\n\u56db\u3001\u552f\u4e00\u7d22\u5f15\uff1a<\/p>\n
\u76ee\u524d\uff0c\u53ea\u6709B-Tree\u7d22\u5f15\u53ef\u4ee5\u88ab\u58f0\u660e\u4e3a\u552f\u4e00\u7d22\u5f15\u3002\nCREATE UNIQUE INDEX name ON table (column [, ...]);\n\u5982\u679c\u7d22\u5f15\u58f0\u660e\u4e3a\u552f\u4e00\u7d22\u5f15\uff0c\u90a3\u4e48\u5c31\u4e0d\u5141\u8bb8\u51fa\u73b0\u591a\u4e2a\u7d22\u5f15\u503c\u76f8\u540c\u7684\u884c\u3002\u6211\u4eec\u8ba4\u4e3aNULL\u503c\u76f8\u4e92\u95f4\u4e0d\u76f8\u7b49\u3002<\/code><\/pre>\n\u4e94\u3001\u8868\u8fbe\u5f0f\u7d22\u5f15\uff1a<\/p>\n
\u8868\u8fbe\u5f0f\u7d22\u5f15\u4e3b\u8981\u7528\u4e8e\u5728\u67e5\u8be2\u6761\u4ef6\u4e2d\u5b58\u5728\u57fa\u4e8e\u67d0\u4e2a\u5b57\u6bb5\u7684\u51fd\u6570\u6216\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u4e0e\u5176\u4ed6\u503c\u8fdb\u884c\u6bd4\u8f83\u7684\u60c5\u51b5\uff0c\u5982\uff1a\nSELECT * FROM test1 WHERE lower(col1) = 'value';\n\u6b64\u65f6\uff0c\u5982\u679c\u6211\u4eec\u4ec5\u4ec5\u662f\u5728col1\u5b57\u6bb5\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0c\u90a3\u4e48\u8be5\u67e5\u8be2\u5728\u6267\u884c\u65f6\u4e00\u5b9a\u4e0d\u4f1a\u4f7f\u7528\u8be5\u7d22\u5f15\uff0c\u800c\u662f\u76f4\u63a5\u8fdb\u884c\u5168\u8868\u626b\u63cf\u3002\u5982\u679c\u8be5\u8868\u7684\u6570\u636e\u91cf\u8f83\u5927\uff0c\u90a3\u4e48\u6267\u884c\u8be5\u67e5\u8be2\u4e5f\u5c06\u4f1a\u9700\u8981\u5f88\u957f\u65f6\u95f4\u3002\u89e3\u51b3\u8be5\u95ee\u9898\u7684\u529e\u6cd5\u975e\u5e38\u7b80\u5355\uff0c\u5728test1\u8868\u4e0a\u5efa\u7acb\u57fa\u4e8ecol1\u5b57\u6bb5\u7684\u8868\u8fbe\u5f0f\u7d22\u5f15\uff0c\u5982\uff1a\nCREATE INDEX test1_lower_col1_idx ON test1 (lower(col1));\n\u5982\u679c\u6211\u4eec\u628a\u8be5\u7d22\u5f15\u58f0\u660e\u4e3aUNIQUE\uff0c\u90a3\u4e48\u5b83\u4f1a\u7981\u6b62\u521b\u5efa\u90a3\u79cdcol1\u6570\u503c\u53ea\u662f\u5927\u5c0f\u5199\u6709\u533a\u522b\u7684\u6570\u636e\u884c\uff0c\u4ee5\u53cacol1\u6570\u503c\u5b8c\u5168\u76f8\u540c\u7684\u6570\u636e\u884c\u3002\u56e0\u6b64\uff0c\u5728\u8868\u8fbe\u5f0f\u4e0a\u7684\u7d22\u5f15\u53ef\u4ee5\u7528\u4e8e\u5f3a\u5236\u90a3\u4e9b\u65e0\u6cd5\u5b9a\u4e49\u4e3a\u7b80\u5355\u552f\u4e00\u7ea6\u675f\u7684\u7ea6\u675f\u3002\u73b0\u5728\u8ba9\u6211\u4eec\u518d\u770b\u4e00\u4e2a\u5e94\u7528\u8868\u8fbe\u5f0f\u7d22\u5f15\u7684\u4f8b\u5b50\u3002\nSELECT * FROM people WHERE (first_name || ' ' || last_name) = 'John Smith';\n\u548c\u4e0a\u9762\u7684\u4f8b\u5b50\u4e00\u6837\uff0c\u5c3d\u7ba1\u6211\u4eec\u53ef\u80fd\u4f1a\u4e3afirst_name\u548clast_name\u5206\u522b\u521b\u5efa\u72ec\u7acb\u7d22\u5f15\uff0c\u6216\u8005\u662f\u57fa\u4e8e\u8fd9\u4e24\u4e2a\u5b57\u6bb5\u7684\u590d\u5408\u7d22\u5f15\uff0c\u5728\u6267\u884c\u8be5\u67e5\u8be2\u8bed\u53e5\u65f6\uff0c\u8fd9\u4e9b\u7d22\u5f15\u5747\u4e0d\u4f1a\u88ab\u4f7f\u7528\uff0c\u8be5\u67e5\u8be2\u80fd\u591f\u4f7f\u7528\u7684\u7d22\u5f15\u53ea\u6709\u6211\u4eec\u4e0b\u9762\u521b\u5efa\u7684\u8868\u8fbe\u5f0f\u7d22\u5f15\u3002\nCREATE INDEX people_names ON people ((first_name || ' ' || last_name));\nCREATE INDEX\u547d\u4ee4\u7684\u8bed\u6cd5\u901a\u5e38\u8981\u6c42\u5728\u7d22\u5f15\u8868\u8fbe\u5f0f\u5468\u56f4\u4e66\u5199\u5706\u62ec\u5f27\uff0c\u5c31\u50cf\u6211\u4eec\u5728\u7b2c\u4e8c\u4e2a\u4f8b\u5b50\u91cc\u663e\u793a\u7684\u90a3\u6837\u3002\u5982\u679c\u8868\u8fbe\u5f0f\u53ea\u662f\u4e00\u4e2a\u51fd\u6570\u8c03\u7528\uff0c\u90a3\u4e48\u53ef\u4ee5\u7701\u7565\uff0c\u5c31\u50cf\u6211\u4eec\u5728\u7b2c\u4e00\u4e2a\u4f8b\u5b50\u91cc\u663e\u793a\u7684\u90a3\u6837\u3002\n\u4ece\u7d22\u5f15\u7ef4\u62a4\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u7d22\u5f15\u8868\u8fbe\u5f0f\u8981\u76f8\u5bf9\u4f4e\u6548\u4e00\u4e9b\uff0c\u56e0\u4e3a\u5728\u63d2\u5165\u6570\u636e\u6216\u8005\u66f4\u65b0\u6570\u636e\u7684\u65f6\u5019\uff0c\u90fd\u5fc5\u987b\u4e3a\u8be5\u884c\u8ba1\u7b97\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\uff0c\u5e76\u5c06\u8be5\u7ed3\u679c\u76f4\u63a5\u5b58\u50a8\u5230\u7d22\u5f15\u91cc\u3002\u7136\u800c\u5728\u67e5\u8be2\u65f6\uff0cPostgreSQL\u5c31\u4f1a\u628a\u5b83\u4eec\u770b\u505aWHERE idxcol = 'constant'\uff0c\u56e0\u6b64\u641c\u7d22\u7684\u901f\u5ea6\u7b49\u6548\u4e8e\u57fa\u4e8e\u7b80\u5355\u7d22\u5f15\u7684\u67e5\u8be2\u3002\u901a\u5e38\u800c\u8a00\uff0c\u6211\u4eec\u53ea\u662f\u5e94\u8be5\u5728\u68c0\u7d22\u901f\u5ea6\u6bd4\u63d2\u5165\u548c\u66f4\u65b0\u901f\u5ea6\u66f4\u91cd\u8981\u7684\u573a\u666f\u4e0b\u4f7f\u7528\u8868\u8fbe\u5f0f\u7d22\u5f15\u3002 <\/code><\/pre>\n\u516d\u3001\u90e8\u5206\u7d22\u5f15\uff1a<\/p>\n
\u90e8\u5206\u7d22\u5f15(partial index)\u662f\u5efa\u7acb\u5728\u4e00\u4e2a\u8868\u7684\u5b50\u96c6\u4e0a\u7684\u7d22\u5f15\uff0c\u800c\u8be5\u5b50\u96c6\u662f\u7531\u4e00\u4e2a\u6761\u4ef6\u8868\u8fbe\u5f0f\u5b9a\u4e49\u7684(\u53eb\u505a\u90e8\u5206\u7d22\u5f15\u7684\u8c13\u8bcd)\u3002\u8be5\u7d22\u5f15\u53ea\u5305\u542b\u8868\u4e2d\u90a3\u4e9b\u6ee1\u8db3\u8fd9\u4e2a\u8c13\u8bcd\u7684\u884c\u3002\n\u7531\u4e8e\u4e0d\u662f\u5728\u6240\u6709\u7684\u60c5\u51b5\u4e0b\u90fd\u9700\u8981\u66f4\u65b0\u7d22\u5f15\uff0c\u56e0\u6b64\u90e8\u5206\u7d22\u5f15\u4f1a\u63d0\u9ad8\u6570\u636e\u63d2\u5165\u548c\u6570\u636e\u66f4\u65b0\u7684\u6548\u7387\u3002\u7136\u800c\u53c8\u56e0\u4e3a\u90e8\u5206\u7d22\u5f15\u6bd4\u666e\u901a\u7d22\u5f15\u8981\u5c0f\uff0c\u56e0\u6b64\u53ef\u4ee5\u66f4\u597d\u7684\u63d0\u9ad8\u786e\u5b9e\u9700\u8981\u7d22\u5f15\u90e8\u5206\u7684\u67e5\u8be2\u6548\u7387\u3002\u89c1\u4ee5\u4e0b\u4e09\u4e2a\u793a\u4f8b\uff1a\n1. \u7d22\u5f15\u5b57\u6bb5\u548c\u8c13\u8bcd\u6761\u4ef6\u5b57\u6bb5\u4e00\u81f4\uff1a\nCREATE INDEX access_log_client_ip_ix ON access_log(client_ip)\n WHERE NOT (client_ip > inet '192.168.100.0' AND client_ip < inet '192.168.100.255');\n\u4e0b\u9762\u7684\u67e5\u8be2\u5c06\u4f1a\u7528\u5230\u8be5\u90e8\u5206\u7d22\u5f15\uff1a\nSELECT * FROM access_log WHERE url = '\/index.html' AND client_ip = inet '212.78.10.32';\n\u4e0b\u9762\u7684\u67e5\u8be2\u5c06\u4e0d\u4f1a\u7528\u8be5\u90e8\u5206\u7d22\u5f15\uff1a\n\u4e00\u4e2a\u4e0d\u80fd\u4f7f\u7528\u8fd9\u4e2a\u7d22\u5f15\u7684\u67e5\u8be2\u53ef\u4ee5\u662f\u2236\nSELECT * FROM access_log WHERE client_ip = inet '192.168.100.23';\n\n2. \u7d22\u5f15\u5b57\u6bb5\u548c\u8c13\u8bcd\u6761\u4ef6\u5b57\u6bb5\u4e0d\u4e00\u81f4\uff1a\nPostgreSQL\u652f\u6301\u5e26\u4efb\u610f\u8c13\u8bcd\u7684\u90e8\u5206\u7d22\u5f15\uff0c\u552f\u4e00\u7684\u7ea6\u675f\u662f\u8c13\u8bcd\u7684\u5b57\u6bb5\u4e5f\u8981\u6765\u81ea\u4e8e\u540c\u6837\u7684\u6570\u636e\u8868\u3002\u6ce8\u610f\uff0c\u5982\u679c\u4f60\u5e0c\u671b\u4f60\u7684\u67e5\u8be2\u8bed\u53e5\u80fd\u591f\u7528\u5230\u90e8\u5206\u7d22\u5f15\uff0c\u90a3\u4e48\u5c31\u8981\u6c42\u8be5\u67e5\u8be2\u8bed\u53e5\u7684\u6761\u4ef6\u90e8\u5206\u5fc5\u987b\u548c\u90e8\u5206\u7d22\u5f15\u7684\u8c13\u8bcd\u5b8c\u5168\u5339\u914d\u3002 \u51c6\u786e\u8bf4\uff0c\u53ea\u6709\u5728PostgreSQL\u80fd\u591f\u8bc6\u522b\u51fa\u8be5\u67e5\u8be2\u7684WHERE\u6761\u4ef6\u5728\u6570\u5b66\u4e0a\u6db5\u76d6\u4e86\u8be5\u7d22\u5f15\u7684\u8c13\u8bcd\u65f6\uff0c\u8fd9\u4e2a\u90e8\u5206\u7d22\u5f15\u624d\u80fd\u88ab\u7528\u4e8e\u8be5\u67e5\u8be2\u3002\nCREATE INDEX orders_unbilled_index ON orders(order_nr) WHERE billed is not true;\n\u4e0b\u9762\u7684\u67e5\u8be2\u4e00\u5b9a\u4f1a\u7528\u5230\u8be5\u90e8\u5206\u7d22\u5f15\uff1a\nSELECT * FROM orders WHERE billed is not true AND order_nr < 10000;\n\u90a3\u4e48\u5bf9\u4e8e\u5982\u4e0b\u67e5\u8be2\u5462\uff1f\nSELECT * FROM orders WHERE billed is not true AND amount > 5000.00;\n\u8fd9\u4e2a\u67e5\u8be2\u5c06\u4e0d\u50cf\u4e0a\u9762\u90a3\u4e2a\u67e5\u8be2\u8fd9\u4e48\u9ad8\u6548\uff0c\u6bd5\u7adf\u67e5\u8be2\u7684\u6761\u4ef6\u8bed\u53e5\u4e2d\u6ca1\u6709\u7528\u5230\u7d22\u5f15\u5b57\u6bb5\uff0c\u7136\u800c\u67e5\u8be2\u6761\u4ef6\"billed is not true\"\u5374\u548c\u90e8\u5206\u7d22\u5f15\u7684\u8c13\u8bcd\u5b8c\u5168\u5339\u914d\uff0c\u56e0\u6b64PostgreSQL\u5c06\u626b\u63cf\u6574\u4e2a\u7d22\u5f15\u3002\u8fd9\u6837\u53ea\u6709\u5728\u7d22\u5f15\u6570\u636e\u76f8\u5bf9\u8f83\u5c11\u7684\u60c5\u51b5\u4e0b\uff0c\u8be5\u67e5\u8be2\u624d\u80fd\u66f4\u6709\u6548\u4e00\u4e9b\u3002\n\u4e0b\u9762\u7684\u67e5\u8be2\u5c06\u4e0d\u4f1a\u7528\u5230\u90e8\u5206\u7d22\u5f15\u3002\nSELECT * FROM orders WHERE order_nr = 3501;\n\n3. \u6570\u636e\u8868\u5b50\u96c6\u7684\u552f\u4e00\u6027\u7ea6\u675f\uff1a\nCREATE TABLE tests (\n subject text,\n target text,\n success boolean,\n ...\n);\nCREATE UNIQUE INDEX tests_success_constraint ON tests(subject, target) WHERE success;\n\u8be5\u90e8\u5206\u7d22\u5f15\u5c06\u53ea\u4f1a\u5bf9success\u5b57\u6bb5\u503c\u4e3atrue\u7684\u6570\u636e\u8fdb\u884c\u552f\u4e00\u6027\u7ea6\u675f\u3002\u5728\u5b9e\u9645\u7684\u5e94\u7528\u4e2d\uff0c\u5982\u679c\u6210\u529f\u7684\u6570\u636e\u8f83\u5c11\uff0c\u800c\u4e0d\u6210\u529f\u7684\u6570\u636e\u8f83\u591a\u65f6\uff0c\u8be5\u5b9e\u73b0\u65b9\u6cd5\u5c06\u4f1a\u975e\u5e38\u9ad8\u6548\u3002<\/code><\/pre>\n\u4e03\u3001\u68c0\u67e5\u7d22\u5f15\u7684\u4f7f\u7528\uff1a<\/p>\n
\u89c1\u4ee5\u4e0b\u56db\u6761\u5efa\u8bae\uff1a\n1. \u603b\u662f\u5148\u8fd0\u884cANALYZE\u3002\n\u8be5\u547d\u4ee4\u5c06\u4f1a\u6536\u96c6\u8868\u4e2d\u6570\u503c\u5206\u5e03\u72b6\u51b5\u7684\u7edf\u8ba1\u3002\u5728\u4f30\u7b97\u4e00\u4e2a\u67e5\u8be2\u8fd4\u56de\u7684\u884c\u6570\u65f6\u9700\u8981\u8fd9\u4e2a\u4fe1\u606f\uff0c\u800c\u89c4\u5212\u5668\u5219\u9700\u8981\u8fd9\u4e2a\u884c\u6570\u4ee5\u4fbf\u7ed9\u6bcf\u4e2a\u53ef\u80fd\u7684\u67e5\u8be2\u89c4\u5212\u8d4b\u4e88\u771f\u5b9e\u7684\u5f00\u9500\u503c\u3002\u5982\u679c\u7f3a\u4e4f\u4efb\u4f55\u771f\u5b9e\u7684\u7edf\u8ba1\u4fe1\u606f\uff0c\u90a3\u4e48\u5c31\u4f1a\u4f7f\u7528\u4e00\u4e9b\u7f3a\u7701\u6570\u503c\uff0c\u8fd9\u6837\u80af\u5b9a\u662f\u4e0d\u51c6\u786e\u7684\u3002\u56e0\u6b64\uff0c\u5982\u679c\u8fd8\u6ca1\u6709\u8fd0\u884cANALYZE\u5c31\u68c0\u67e5\u4e00\u4e2a\u7d22\u5f15\u7684\u4f7f\u7528\u72b6\u51b5\uff0c\u90a3\u5c06\u4f1a\u662f\u4e00\u6b21\u5931\u8d25\u7684\u68c0\u67e5\u3002 \n2. \u4f7f\u7528\u771f\u5b9e\u7684\u6570\u636e\u505a\u5b9e\u9a8c\u3002\n\u7528\u6d4b\u8bd5\u6570\u636e\u586b\u5145\u6570\u636e\u8868\uff0c\u90a3\u4e48\u8be5\u8868\u7684\u7d22\u5f15\u5c06\u53ea\u4f1a\u57fa\u4e8e\u6d4b\u8bd5\u6570\u636e\u6765\u8bc4\u4f30\u8be5\u5982\u4f55\u4f7f\u7528\u7d22\u5f15\uff0c\u800c\u4e0d\u662f\u5bf9\u6240\u6709\u7684\u6570\u636e\u90fd\u5982\u6b64\u4f7f\u7528\u3002\u6bd4\u5982\u4ece100000\u884c\u4e2d\u90091000\u884c\uff0c\u89c4\u5212\u5668\u53ef\u80fd\u4f1a\u8003\u8651\u4f7f\u7528\u7d22\u5f15\uff0c\u90a3\u4e48\u5982\u679c\u4ece100\u884c\u4e2d\u90091\u884c\u5c31\u5f88\u96be\u8bf4\u4e5f\u4f1a\u4f7f\u7528\u7d22\u5f15\u4e86\u3002\u56e0\u4e3a100\u884c\u7684\u6570\u636e\u5f88\u53ef\u80fd\u662f\u5b58\u50a8\u5728\u4e00\u4e2a\u78c1\u76d8\u9875\u9762\u4e2d\uff0c\u7136\u800c\u6ca1\u6709\u4efb\u4f55\u67e5\u8be2\u89c4\u5212\u80fd\u6bd4\u901a\u8fc7\u987a\u5e8f\u8bbf\u95ee\u4e00\u4e2a\u78c1\u76d8\u9875\u9762\u66f4\u52a0\u9ad8\u6548\u4e86\u3002\u4e0e\u6b64\u540c\u65f6\uff0c\u5728\u6a21\u62df\u6d4b\u8bd5\u6570\u636e\u65f6\u4e5f\u8981\u6ce8\u610f\uff0c\u5982\u679c\u8fd9\u4e9b\u6570\u636e\u662f\u975e\u5e38\u76f8\u4f3c\u7684\u6570\u636e\u3001\u5b8c\u5168\u968f\u673a\u7684\u6570\u636e\uff0c\u6216\u6309\u7167\u6392\u5e8f\u987a\u5e8f\u63d2\u5165\u7684\u6570\u636e\uff0c\u90fd\u4f1a\u4ee4\u7edf\u8ba1\u4fe1\u606f\u504f\u79bb\u5b9e\u9645\u6570\u636e\u5e94\u8be5\u5177\u6709\u7684\u7279\u5f81\u3002 \n3. \u5982\u679c\u7d22\u5f15\u6ca1\u6709\u5f97\u5230\u4f7f\u7528\uff0c\u90a3\u4e48\u5728\u6d4b\u8bd5\u4e2d\u5f3a\u5236\u5b83\u7684\u4f7f\u7528\u4e5f\u8bb8\u4f1a\u6709\u4e9b\u4ef7\u503c\u3002\u6709\u4e00\u4e9b\u8fd0\u884c\u65f6\u53c2\u6570\u53ef\u4ee5\u5173\u95ed\u5404\u79cd\u5404\u6837\u7684\u67e5\u8be2\u89c4\u5212\u3002\n4. \u5f3a\u5236\u4f7f\u7528\u7d22\u5f15\u7528\u6cd5\u5c06\u4f1a\u5bfc\u81f4\u4e24\u79cd\u53ef\u80fd\uff1a\u4e00\u662f\u7cfb\u7edf\u9009\u62e9\u662f\u6b63\u786e\u7684\uff0c\u4f7f\u7528\u7d22\u5f15\u5b9e\u9645\u4e0a\u5e76\u4e0d\u5408\u9002\uff0c\u4e8c\u662f\u67e5\u8be2\u8ba1\u5212\u7684\u5f00\u9500\u8ba1\u7b97\u5e76\u4e0d\u80fd\u53cd\u6620\u73b0\u5b9e\u60c5\u51b5\u3002\u8fd9\u6837\u4f60\u5c31\u5e94\u8be5\u5bf9\u4f7f\u7528\u548c\u4e0d\u4f7f\u7528\u7d22\u5f15\u7684\u67e5\u8be2\u8fdb\u884c\u8ba1\u65f6\uff0c\u8fd9\u4e2a\u65f6\u5019EXPLAIN ANALYZE\u547d\u4ee4\u5c31\u5f88\u6709\u7528\u4e86\u3002<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u4e00\u3001\u7d22\u5f15\u7684\u7c7b\u578b\uff1a PostgreSQL\u63d0\u4f9b\u4e86\u591a\u3000\u3000\u79cd\u7d22\u5f15\u7c7b\u578b\uff1aB-Tree\u3001Hash\u3001GiST\u548cGIN\uff0c\u7531\u4e8e\u5b83\u4eec\u4f7f\u7528\u4e86\u4e0d\u540c\u7684\u7b97\u6cd5\uff0c\u56e0\u6b64\u6bcf\u79cd\u7d22\u5f15\u7c7b\u578b\u90fd\u6709\u5176\u9002\u5408\u7684\u67e5\u8be2\u7c7b\u578b\uff0c\u7f3a\u7701\u65f6\uff0cCREATE INDEX\u547d\u4ee4\u5c06\u521b\u5efaB-Tree\u7d22\u5f15\u3002 1. B-Tree: CREATE TABLE test1 ( id integer, content varchar ); CREATE INDEX test1_id_index ON test1 (id); B-Tree\u7d22\u5f15\u4e3b\u8981\u7528\u4e8e\u7b49\u4e8e\u548c\u8303\u56f4\u67e5\u8be2\uff0c\u7279\u522b\u662f\u5f53\u7d22\u5f15\u5217\u5305\u542b\u64cd\u4f5c\u7b26” “\u4f5c\u4e3a\u67e5\u8be2\u6761\u4ef6\u65f6\uff0cPostgreSQL\u7684\u67e5\u8be2\u89c4\u5212\u5668\u90fd\u4f1a\u8003\u8651\u4f7f\u7528B-Tree\u7d22\u5f15\u3002\u5728\u4f7f\u7528BETWEEN\u3001IN\u3001IS NULL\u548cIS NOT NULL\u7684\u67e5\u8be2\u4e2d\uff0cPostgreSQL\u4e5f\u53ef\u4ee5\u4f7f\u7528B-Tree\u7d22\u5f15\u3002\u7136\u800c\u5bf9\u4e8e\u57fa\u4e8e\u6a21\u5f0f\u5339\u914d\u64cd\u4f5c\u7b26\u7684\u67e5\u8be2\uff0c\u5982LIKE\u3001ILIKE\u3001~\u548c ~*\uff0c\u4ec5\u5f53\u6a21\u5f0f\u5b58\u5728\u4e00\u4e2a\u5e38\u91cf\uff0c\u4e14\u8be5\u5e38\u91cf\u4f4d\u4e8e\u6a21\u5f0f\u5b57\u7b26\u4e32\u7684\u5f00\u5934\u65f6\uff0c\u5982col LIKE ‘foo%’\u6216col ~ ‘^foo’\uff0c\u7d22\u5f15\u624d\u4f1a\u751f\u6548\uff0c\u5426\u5219\u5c06\u4f1a\u6267\u884c\u5168\u8868\u626b\u63cf\uff0c\u5982\uff1acol LIKE ‘%bar’\u3002 2. Hash\uff1a CREATE INDEX name ON table USING hash (column); \u6563\u5217(Hash)\u7d22\u5f15\u53ea\u80fd\u5904\u7406\u7b80\u5355\u7684\u7b49\u4e8e\u6bd4\u8f83\u3002\u5f53\u7d22\u5f15\u5217\u4f7f\u7528\u7b49\u4e8e\u64cd\u4f5c\u7b26\u8fdb\u884c\u6bd4\u8f83\u65f6\uff0c\u67e5\u8be2\u89c4\u5212\u5668\u4f1a\u8003\u8651\u4f7f\u7528\u6563\u5217\u7d22\u5f15\u3002 \u8fd9\u91cc\u9700\u8981\u989d\u5916\u8bf4\u660e\u7684\u662f\uff0cPostgreSQL\u6563\u5217\u7d22\u5f15\u7684\u6027\u80fd\u4e0d\u6bd4B-Tree\u7d22\u5f15\u5f3a\uff0c\u4f46\u662f\u6563\u5217\u7d22\u5f15\u7684\u5c3a\u5bf8\u548c\u6784\u9020\u65f6\u95f4\u5219\u66f4\u5dee\u3002\u53e6\u5916\uff0c\u7531\u4e8e\u6563\u5217\u7d22\u5f15\u64cd\u4f5c\u76ee\u524d\u6ca1\u6709\u8bb0\u5f55WAL\u65e5\u5fd7\uff0c\u56e0\u6b64\u4e00\u65e6\u53d1\u751f\u4e86\u6570\u636e\u5e93\u5d29\u6e83\uff0c\u6211\u4eec\u5c06\u4e0d\u5f97\u4e0d\u7528REINDEX\u91cd\u5efa\u6563\u5217\u7d22\u5f15\u3002 3. GiST\uff1a GiST\u7d22\u5f15\u4e0d\u662f\u4e00\u79cd\u5355\u72ec\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u800c\u662f\u4e00\u79cd\u67b6\u6784\uff0c\u53ef\u4ee5\u5728\u8be5\u67b6\u6784\u4e0a\u5b9e\u73b0\u5f88\u591a\u4e0d\u540c\u7684\u7d22\u5f15\u7b56\u7565\u3002\u4ece\u800c\u53ef\u4ee5\u4f7fGiST\u7d22\u5f15\u6839\u636e\u4e0d\u540c\u7684\u7d22\u5f15\u7b56\u7565\uff0c\u800c\u4f7f\u7528\u7279\u5b9a\u7684\u64cd\u4f5c\u7b26\u7c7b\u578b\u3002 4. GIN\uff1a GIN\u7d22\u5f15\u662f\u53cd\u8f6c\u7d22\u5f15\uff0c\u5b83\u53ef\u4ee5\u5904\u7406\u5305\u542b\u591a\u4e2a\u952e\u7684\u503c(\u6bd4\u5982\u6570\u7ec4)\u3002\u4e0eGiST\u7c7b\u4f3c\uff0cGIN\u540c\u6837\u652f\u6301\u7528\u6237\u5b9a\u4e49\u7684\u7d22\u5f15\u7b56\u7565\uff0c\u4ece\u800c\u53ef\u4ee5\u4f7fGIN\u7d22\u5f15\u6839\u636e\u4e0d\u540c\u7684\u7d22\u5f15\u7b56\u7565\uff0c\u800c\u4f7f\u7528\u7279\u5b9a\u7684\u64cd\u4f5c\u7b26\u7c7b\u578b\u3002\u4f5c\u4e3a\u793a\u4f8b\uff0cPostgreSQL\u7684\u6807\u51c6\u53d1\u5e03\u4e2d\u5305\u542b\u4e86\u7528\u4e8e\u4e00\u7ef4\u6570\u7ec4\u7684GIN\u64cd\u4f5c\u7b26\u7c7b\u578b\uff0c\u5982\uff1a\u3001=\u3001&&\u7b49\u3002 \u4e8c\u3001\u590d\u5408\u7d22\u5f15\uff1a PostgreSQL\u4e2d\u7684\u7d22\u5f15\u53ef\u4ee5\u5b9a\u4e49\u5728\u6570\u636e\u8868\u7684\u591a\u4e2a\u5b57\u6bb5\u4e0a\uff0c\u5982\uff1a CREATE TABLE test2 ( major int, minor int, name varchar } CREATE INDEX test2_mm_idx ON test2 (major, minor); \u5728\u5f53\u524d\u7684\u7248\u672c\u4e2d\uff0c\u53ea\u6709B-tree\u3001GiST\u548cGIN\u652f\u6301\u590d\u5408\u7d22\u5f15\uff0c\u5176\u4e2d\u6700\u591a\u53ef\u4ee5\u58f0\u660e32\u4e2a\u5b57\u6bb5\u3002 1. B-Tree\u7c7b\u578b\u7684\u590d\u5408\u7d22\u5f15\uff1a \u5728B-Tree\u7c7b\u578b\u7684\u590d\u5408\u7d22\u5f15\u4e2d\uff0c\u8be5\u7d22\u5f15\u5b57\u6bb5\u7684\u4efb\u610f\u5b50\u96c6\u5747\u53ef\u7528\u4e8e\u67e5\u8be2\u6761\u4ef6\uff0c\u4e0d\u8fc7\uff0c\u53ea\u6709\u5f53\u590d\u5408\u7d22\u5f15\u4e2d\u7684\u7b2c\u4e00\u4e2a\u7d22\u5f15\u5b57\u6bb5(\u6700\u5de6\u8fb9)\u88ab\u5305\u542b\u5176\u4e2d\u65f6\uff0c\u624d\u53ef\u4ee5\u83b7\u5f97\u6700\u9ad8\u6548\u7387\u3002 2. GiST\u7c7b\u578b\u7684\u590d\u5408\u7d22\u5f15\uff1a \u5728GiST\u7c7b\u578b\u7684\u590d\u5408\u7d22\u5f15\u4e2d\uff0c\u53ea\u6709\u5f53\u7b2c\u4e00\u4e2a\u7d22\u5f15\u5b57\u6bb5\u88ab\u5305\u542b\u5728\u67e5\u8be2\u6761\u4ef6\u4e2d\u65f6\uff0c\u624d\u80fd\u51b3\u5b9a\u8be5\u67e5\u8be2\u4f1a\u626b\u63cf\u591a\u5c11\u7d22\u5f15\u6570\u636e\uff0c\u800c\u5176\u4ed6\u7d22\u5f15\u5b57\u6bb5\u4e0a\u7684\u6761\u4ef6\u53ea\u662f\u4f1a\u9650\u5236\u7d22\u5f15\u8fd4\u56de\u7684\u6761\u76ee\u3002\u5047\u5982\u7b2c\u4e00\u4e2a\u7d22\u5f15\u5b57\u6bb5\u4e0a\u7684\u5927\u591a\u6570\u6570\u636e\u90fd\u6709\u76f8\u540c\u7684\u952e\u503c\uff0c\u90a3\u4e48\u6b64\u65f6\u5e94\u7528GiST\u7d22\u5f15\u5c31\u4f1a\u6bd4\u8f83\u4f4e\u6548\u3002 3. GIN\u7c7b\u578b\u7684\u590d\u5408\u7d22\u5f15\uff1a \u4e0eB-Tree\u548cGiST\u7d22\u5f15\u4e0d\u540c\u7684\u662f\uff0cGIN\u590d\u5408\u7d22\u5f15\u4e0d\u4f1a\u53d7\u5230\u67e5\u8be2\u6761\u4ef6\u4e2d\u4f7f\u7528\u4e86\u54ea\u4e9b\u7d22\u5f15\u5b57\u6bb5\u5b50\u96c6\u7684\u5f71\u54cd\uff0c\u65e0\u8bba\u662f\u54ea\u79cd\u7ec4\u5408\uff0c\u90fd\u4f1a\u5f97\u5230\u76f8\u540c\u7684\u6548\u7387\u3002 \u4f7f\u7528\u590d\u5408\u7d22\u5f15\u5e94\u8be5\u8c28\u614e\u3002\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u5355\u4e00\u5b57\u6bb5\u4e0a\u7684\u7d22\u5f15\u5c31\u5df2\u7ecf\u8db3\u591f\u4e86\uff0c\u5e76\u4e14\u8fd8\u8282\u7ea6\u65f6\u95f4\u548c\u7a7a\u95f4\u3002\u9664\u975e\u8868\u7684\u4f7f\u7528\u6a21\u5f0f\u975e\u5e38\u56fa\u5b9a\uff0c\u5426\u5219\u8d85\u8fc7\u4e09\u4e2a\u5b57\u6bb5\u7684\u7d22\u5f15\u51e0\u4e4e\u6ca1\u4ec0\u4e48\u7528\u5904\u3002 \u4e09\u3001\u7ec4\u5408\u591a\u4e2a\u7d22\u5f15\uff1a PostgreSQL\u53ef\u4ee5\u5728\u67e5\u8be2\u65f6\u7ec4\u5408\u591a\u4e2a\u7d22\u5f15(\u5305\u62ec\u540c\u4e00\u7d22\u5f15\u7684\u591a\u6b21\u4f7f\u7528)\uff0c\u6765\u5904\u7406\u5355\u4e2a\u7d22\u5f15\u626b\u63cf\u4e0d\u80fd\u5b9e\u73b0\u7684\u573a\u5408\u3002\u4e0e\u6b64\u540c\u65f6\uff0c\u7cfb\u7edf\u8fd8\u53ef\u4ee5\u5728\u591a\u4e2a\u7d22\u5f15\u626b\u63cf\u4e4b\u95f4\u7ec4\u6210AND\u548cOR\u7684\u6761\u4ef6\u3002\u6bd4\u5982\uff0c\u4e00\u4e2a\u7c7b\u4f3cWHERE x = 42 OR x = 47 OR x = 53 OR x = 99\u7684\u67e5\u8be2\uff0c\u53ef\u4ee5\u88ab\u5206\u89e3\u6210\u56db\u4e2a\u72ec\u7acb\u7684\u57fa\u4e8ex\u5b57\u6bb5\u7d22\u5f15\u7684\u626b\u63cf\uff0c\u6bcf\u4e2a\u626b\u63cf\u4f7f\u7528\u4e00\u4e2a\u67e5\u8be2\u5b50\u53e5\uff0c\u4e4b\u540e\u518d\u5c06\u8fd9\u4e9b\u626b\u63cf\u7ed3\u679cOR\u5728\u4e00\u8d77\u5e76\u751f\u6210\u6700\u7ec8\u7684\u7ed3\u679c\u3002\u53e6\u5916\u4e00\u4e2a\u4f8b\u5b50\u662f\uff0c\u5982\u679c\u6211\u4eec\u5728x\u548cy\u4e0a\u5206\u522b\u5b58\u5728\u72ec\u7acb\u7684\u7d22\u5f15\uff0c\u90a3\u4e48\u4e00\u4e2a\u7c7b\u4f3cWHERE x = 5 AND y = 6\u7684\u67e5\u8be2\uff0c\u5c31\u4f1a\u5206\u522b\u57fa\u4e8e\u8fd9\u4e24\u4e2a\u5b57\u6bb5\u7684\u7d22\u5f15\u8fdb\u884c\u626b\u63cf\uff0c\u4e4b\u540e\u518d\u5c06\u5404\u81ea\u626b\u63cf\u7684\u7ed3\u679c\u8fdb\u884cAND\u64cd\u4f5c\u5e76\u751f\u6210\u6700\u7ec8\u7684\u7ed3\u679c\u884c\u3002 \u4e3a\u4e86\u7ec4\u5408\u591a\u4e2a\u7d22\u5f15\uff0c\u7cfb\u7edf\u626b\u63cf\u6bcf\u4e2a\u9700\u8981\u7684\u7d22\u5f15\uff0c\u7136\u540e\u5728\u5185\u5b58\u91cc\u7ec4\u7ec7\u4e00\u4e2aBITMAP\uff0c\u5b83\u5c06\u7ed9\u51fa\u7d22\u5f15\u626b\u63cf\u51fa\u7684\u6570\u636e\u5728\u6570\u636e\u8868\u4e2d\u7684\u7269\u7406\u4f4d\u7f6e\u3002\u7136\u540e\uff0c\u518d\u6839\u636e\u67e5\u8be2\u7684\u9700\u8981\uff0c\u628a\u8fd9\u4e9b\u4f4d\u56fe\u8fdb\u884cAND\u6216\u8005OR\u7684\u64cd\u4f5c\u5e76\u5f97\u51fa\u6700\u7ec8\u7684BITMAP\u3002\u6700\u540e\uff0c\u68c0\u7d22\u6570\u636e\u8868\u5e76\u8fd4\u56de\u6570\u636e\u884c\u3002\u8868\u7684\u6570\u636e\u884c\u662f\u6309\u7167\u7269\u7406\u987a\u5e8f\u8fdb\u884c\u8bbf\u95ee\u7684\uff0c\u56e0\u4e3a\u8fd9\u662f\u4f4d\u56fe\u7684\u5e03\u5c40\uff0c\u8fd9\u5c31\u610f\u5473\u7740\u4efb\u4f55…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[89],"tags":[],"class_list":["post-1639","post","type-post","status-publish","format-standard","hentry","category-postgres-db"],"_links":{"self":[{"href":"https:\/\/oneai.eu.org\/index.php?rest_route=\/wp\/v2\/posts\/1639","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneai.eu.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/oneai.eu.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/oneai.eu.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/oneai.eu.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1639"}],"version-history":[{"count":1,"href":"https:\/\/oneai.eu.org\/index.php?rest_route=\/wp\/v2\/posts\/1639\/revisions"}],"predecessor-version":[{"id":1640,"href":"https:\/\/oneai.eu.org\/index.php?rest_route=\/wp\/v2\/posts\/1639\/revisions\/1640"}],"wp:attachment":[{"href":"https:\/\/oneai.eu.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1639"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oneai.eu.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1639"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oneai.eu.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1639"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}