{"id":143741,"date":"2024-11-01T00:51:21","date_gmt":"2024-10-31T16:51:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143741\/"},"modified":"2024-11-01T00:51:22","modified_gmt":"2024-10-31T16:51:22","slug":"sql-%e6%9f%a5%e8%a9%a2%ef%bc%9a%e6%97%a5%e6%9c%9f%e7%af%a9%e9%81%b8%e6%8a%80%e5%b7%a7%e5%88%86%e4%ba%ab%ef%bc%88sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%a6%82%e4%bd%95%e6%a0%b9%e6%93%9a%e6%97%a5%e6%9c%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143741\/","title":{"rendered":"SQL \u67e5\u8a62\uff1a\u65e5\u671f\u7be9\u9078\u6280\u5de7\u5206\u4eab\uff08sql \u6578\u64da\u5eab\u5982\u4f55\u6839\u64da\u65e5\u671f\u7be9\u9078\uff09"},"content":{"rendered":"

SQL \u67e5\u8a62\uff1a\u65e5\u671f\u7be9\u9078\u6280\u5de7\u5206\u4eab\uff08SQL \u6578\u64da\u5eab\u5982\u4f55\u6839\u64da\u65e5\u671f\u7be9\u9078\uff09<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u65e5\u671f\u7be9\u9078\u662f\u4e00\u9805\u975e\u5e38\u91cd\u8981\u7684\u6280\u80fd\u3002\u7121\u8ad6\u662f\u67e5\u8a62\u92b7\u552e\u6578\u64da\u3001\u7528\u6236\u8a3b\u518a\u6642\u9593\uff0c\u9084\u662f\u5176\u4ed6\u6642\u9593\u76f8\u95dc\u7684\u6578\u64da\uff0c\u638c\u63e1 SQL \u4e2d\u7684\u65e5\u671f\u7be9\u9078\u6280\u5de7\u90fd\u80fd\u5e6b\u52a9\u6211\u5011\u66f4\u6709\u6548\u5730\u5206\u6790\u548c\u7ba1\u7406\u6578\u64da\u3002\u672c\u6587\u5c07\u5206\u4eab\u4e00\u4e9b\u5e38\u7528\u7684 SQL \u65e5\u671f\u7be9\u9078\u6280\u5de7\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u5728 SQL \u6578\u64da\u5eab\u4e2d\u9032\u884c\u65e5\u671f\u7be9\u9078\u3002<\/p>\n

1. \u65e5\u671f\u683c\u5f0f\u7684\u7406\u89e3<\/h2>\n

\u5728\u9032\u884c\u65e5\u671f\u7be9\u9078\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u4e86\u89e3 SQL \u4e2d\u7684\u65e5\u671f\u683c\u5f0f\u3002\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u53ef\u80fd\u6703\u6709\u4e0d\u540c\u7684\u65e5\u671f\u683c\u5f0f\uff0c\u4f46\u5927\u591a\u6578 SQL \u6578\u64da\u5eab\u90fd\u652f\u6301\u6a19\u6e96\u7684\u65e5\u671f\u683c\u5f0f\uff0c\u5982 ‘YYYY-MM-DD’\u3002\u4f8b\u5982\uff0c’2023-10-01’ \u4ee3\u8868 2023 \u5e74 10 \u6708 1 \u65e5\u3002<\/p>\n

2. \u57fa\u672c\u7684\u65e5\u671f\u7be9\u9078\u67e5\u8a62<\/h2>\n

\u6700\u57fa\u672c\u7684\u65e5\u671f\u7be9\u9078\u67e5\u8a62\u53ef\u4ee5\u4f7f\u7528 WHERE \u5b50\u53e5\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba orders<\/code> \u7684\u8868\u683c\uff0c\u4e26\u4e14\u6211\u5011\u60f3\u67e5\u8a62 2023 \u5e74 10 \u6708 1 \u65e5\u4e4b\u5f8c\u7684\u6240\u6709\u8a02\u55ae\uff1a<\/p>\n

SELECT * FROM orders\nWHERE order_date > '2023-10-01';<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728 2023 \u5e74 10 \u6708 1 \u65e5\u4e4b\u5f8c\u7684\u8a02\u55ae\u8a18\u9304\u3002<\/p>\n
3. \u4f7f\u7528 BETWEEN \u9032\u884c\u7bc4\u570d\u67e5\u8a62<\/h2>\n
\u5982\u679c\u9700\u8981\u67e5\u8a62\u4e00\u6bb5\u6642\u9593\u5167\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528 BETWEEN<\/code> \u95dc\u9375\u5b57\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u67e5\u8a62 2023 \u5e74 10 \u6708 1 \u65e5\u5230 2023 \u5e74 10 \u6708 31 \u65e5\u4e4b\u9593\u7684\u8a02\u55ae\u7684\u7bc4\u4f8b\uff1a<\/p>\n
SELECT * FROM orders\nWHERE order_date BETWEEN '2023-10-01' AND '2023-10-31';<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728\u6307\u5b9a\u65e5\u671f\u7bc4\u570d\u5167\u7684\u8a02\u55ae\u8a18\u9304\u3002<\/p>\n
4. \u4f7f\u7528 DATE \u51fd\u6578\u9032\u884c\u65e5\u671f\u64cd\u4f5c<\/h2>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u5c0d\u65e5\u671f\u9032\u884c\u64cd\u4f5c\uff0c\u4f8b\u5982\u63d0\u53d6\u5e74\u4efd\u3001\u6708\u4efd\u6216\u65e5\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528 SQL \u7684\u65e5\u671f\u51fd\u6578\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u67e5\u8a62 2023 \u5e74\u6240\u6709\u8a02\u55ae\u7684\u7bc4\u4f8b\uff1a<\/p>\n
SELECT * FROM orders\nWHERE YEAR(order_date) = 2023;<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728 2023 \u5e74\u7684\u8a02\u55ae\u8a18\u9304\u3002<\/p>\n
5. \u8655\u7406\u6642\u9593\u6233\uff08TIMESTAMP\uff09<\/h2>\n
\u5982\u679c\u6578\u64da\u5eab\u4e2d\u7684\u65e5\u671f\u6642\u9593\u5b57\u6bb5\u662f\u4ee5\u6642\u9593\u6233\u683c\u5f0f\u5b58\u5132\u7684\uff0c\u5247\u9700\u8981\u6ce8\u610f\u6642\u9593\u7684\u8655\u7406\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u67e5\u8a62\u5728\u7279\u5b9a\u6642\u9593\u7bc4\u570d\u5167\u7684\u8a02\u55ae\u7684\u7bc4\u4f8b\uff1a<\/p>\n
SELECT * FROM orders\nWHERE order_timestamp > '2023-10-01 00:00:00' AND order_timestamp < '2023-10-31 23:59:59';<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u5728 2023 \u5e74 10 \u6708 1 \u65e5\u81f3 10 \u6708 31 \u65e5\u4e4b\u9593\u7684\u6240\u6709\u8a02\u55ae\u8a18\u9304\u3002<\/p>\n
6. \u4f7f\u7528\u7d22\u5f15\u63d0\u9ad8\u67e5\u8a62\u6548\u7387<\/h2>\n
\u5728\u9032\u884c\u65e5\u671f\u7be9\u9078\u6642\uff0c\u70ba\u65e5\u671f\u5b57\u6bb5\u5275\u5efa\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u9019\u5c0d\u65bc\u5927\u578b\u6578\u64da\u96c6\u5c24\u70ba\u91cd\u8981\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\u70ba order_date<\/code> \u5b57\u6bb5\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n
CREATE INDEX idx_order_date ON orders(order_date);<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u52a0\u5feb\u57fa\u65bc\u65e5\u671f\u7684\u67e5\u8a62\u901f\u5ea6\uff0c\u7279\u5225\u662f\u5728\u6578\u64da\u91cf\u8f03\u5927\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u638c\u63e1 SQL \u4e2d\u7684\u65e5\u671f\u7be9\u9078\u6280\u5de7\u5c0d\u65bc\u6578\u64da\u5206\u6790\u548c\u7ba1\u7406\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u4f7f\u7528\u57fa\u672c\u7684\u67e5\u8a62\u3001\u7bc4\u570d\u67e5\u8a62\u3001\u65e5\u671f\u51fd\u6578\u4ee5\u53ca\u7d22\u5f15\uff0c\u6211\u5011\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u8655\u7406\u548c\u5206\u6790\u6642\u9593\u76f8\u95dc\u7684\u6578\u64da\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u9805\u76ee\u9084\u662f\u5927\u578b\u6578\u64da\u5eab\uff0c\u9019\u4e9b\u6280\u5de7\u90fd\u80fd\u5e6b\u52a9\u6211\u5011\u66f4\u597d\u5730\u5229\u7528\u6578\u64da\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u638c\u63e1 SQL \u67e5\u8a62\u4e2d\u7684\u65e5\u671f\u7be9\u9078\u6280\u5de7\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u5730\u6839\u64da\u65e5\u671f\u5728\u6578\u64da\u5eab\u4e2d\u7be9\u9078\u6578\u64da\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-143741","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143741","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=143741"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143741\/revisions"}],"predecessor-version":[{"id":143742,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143741\/revisions\/143742"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143741"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143741"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143741"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}