{"id":169017,"date":"2024-11-06T18:11:16","date_gmt":"2024-11-06T10:11:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/169017\/"},"modified":"2024-11-06T18:11:17","modified_gmt":"2024-11-06T10:11:17","slug":"%e9%9d%a2%e8%a9%a6%e7%aa%81%e6%93%8a%ef%bc%9a%e4%bb%80%e9%ba%bc%e6%83%85%e6%b3%81%e6%9c%83%e5%b0%8e%e8%87%b4-mysql-%e7%b4%a2%e5%bc%95%e5%a4%b1%e6%95%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/169017\/","title":{"rendered":"\u9762\u8a66\u7a81\u64ca\uff1a\u4ec0\u9ebc\u60c5\u6cc1\u6703\u5c0e\u81f4 MySQL \u7d22\u5f15\u5931\u6548\uff1f"},"content":{"rendered":"

\u9762\u8a66\u7a81\u64ca\uff1a\u4ec0\u9ebc\u60c5\u6cc1\u6703\u5c0e\u81f4 MySQL \u7d22\u5f15\u5931\u6548\uff1f<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u6982\u5ff5\u3002\u5b83\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u6e1b\u5c11\u6578\u64da\u6aa2\u7d22\u7684\u6642\u9593\u3002\u7136\u800c\uff0c\u7d22\u5f15\u4e26\u975e\u7e3d\u662f\u80fd\u5920\u767c\u63ee\u5176\u61c9\u6709\u7684\u6548\u80fd\u3002\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0cMySQL \u7684\u7d22\u5f15\u53ef\u80fd\u6703\u5931\u6548\uff0c\u5c0e\u81f4\u67e5\u8a62\u6027\u80fd\u4e0b\u964d\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5c0e\u81f4 MySQL \u7d22\u5f15\u5931\u6548\u7684\u5e7e\u7a2e\u5e38\u898b\u60c5\u6cc1\u3002<\/p>\n

1. \u4f7f\u7528\u4e0d\u7576\u7684\u67e5\u8a62\u689d\u4ef6<\/h2>\n

\u7576\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u4e0d\u7576\u7684\u689d\u4ef6\u6642\uff0c\u7d22\u5f15\u53ef\u80fd\u7121\u6cd5\u88ab\u6709\u6548\u5229\u7528\u3002\u4f8b\u5982\uff0c\u7576\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u4e0d\u7b49\u65bc\uff08\uff09\u3001IS NULL \u6216 IS NOT NULL \u7b49\u689d\u4ef6\u6642\uff0cMySQL \u53ef\u80fd\u7121\u6cd5\u4f7f\u7528\u7d22\u5f15\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n

SELECT * FROM users WHERE age  30;<\/code><\/pre>\n
\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0cMySQL \u53ef\u80fd\u6703\u9078\u64c7\u5168\u8868\u6383\u63cf\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u7d22\u5f15\uff0c\u56e0\u70ba\u4e0d\u7b49\u65bc\u7684\u67e5\u8a62\u689d\u4ef6\u4f7f\u5f97\u7d22\u5f15\u7684\u6548\u7528\u964d\u4f4e\u3002<\/p>\n
2. \u4f7f\u7528\u51fd\u6578\u6216\u8868\u9054\u5f0f<\/h2>\n
\u5982\u679c\u5728\u67e5\u8a62\u4e2d\u5c0d\u7d22\u5f15\u5217\u4f7f\u7528\u4e86\u51fd\u6578\u6216\u8868\u9054\u5f0f\uff0c\u9019\u4e5f\u6703\u5c0e\u81f4\u7d22\u5f15\u5931\u6548\u3002\u4f8b\u5982\uff1a<\/p>\n
SELECT * FROM orders WHERE YEAR(order_date) = 2023;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5c0d\u65bc order_date \u5217\u4f7f\u7528\u4e86 YEAR \u51fd\u6578\uff0c\u9019\u6703\u4f7f\u5f97 MySQL \u7121\u6cd5\u4f7f\u7528\u8a72\u5217\u7684\u7d22\u5f15\uff0c\u56e0\u70ba\u7d22\u5f15\u662f\u57fa\u65bc\u539f\u59cb\u6578\u64da\u7684\uff0c\u800c\u4e0d\u662f\u57fa\u65bc\u51fd\u6578\u7684\u7d50\u679c\u3002<\/p>\n
3. \u4e0d\u9069\u7576\u7684\u6578\u64da\u985e\u578b\u6bd4\u8f03<\/h2>\n
\u5728\u9032\u884c\u67e5\u8a62\u6642\uff0c\u5982\u679c\u6bd4\u8f03\u7684\u6578\u64da\u985e\u578b\u4e0d\u4e00\u81f4\uff0c\u4e5f\u6703\u5c0e\u81f4\u7d22\u5f15\u5931\u6548\u3002\u4f8b\u5982\uff0c\u5c07\u5b57\u7b26\u4e32\u8207\u6574\u6578\u9032\u884c\u6bd4\u8f03\uff1a<\/p>\n
SELECT * FROM products WHERE id = '123';<\/code><\/pre>\n
\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0cMySQL \u53ef\u80fd\u6703\u5c07 id \u5217\u7684\u6574\u6578\u8f49\u63db\u70ba\u5b57\u7b26\u4e32\uff0c\u9019\u6a23\u6703\u5c0e\u81f4\u7d22\u5f15\u7121\u6cd5\u88ab\u6709\u6548\u5229\u7528\u3002<\/p>\n
4. \u4f7f\u7528\u4e86 OR \u689d\u4ef6<\/h2>\n
\u7576\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86 OR \u689d\u4ef6\u6642\uff0cMySQL \u53ef\u80fd\u7121\u6cd5\u4f7f\u7528\u7d22\u5f15\u4f86\u512a\u5316\u67e5\u8a62\u3002\u4f8b\u5982\uff1a<\/p>\n
SELECT * FROM employees WHERE department_id = 1 OR department_id = 2;<\/code><\/pre>\n
\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0cMySQL \u53ef\u80fd\u6703\u9078\u64c7\u5168\u8868\u6383\u63cf\uff0c\u800c\u4e0d\u662f\u4f7f\u7528\u7d22\u5f15\uff0c\u56e0\u70ba\u5b83\u9700\u8981\u6aa2\u67e5\u6240\u6709\u7b26\u5408\u4efb\u4e00\u689d\u4ef6\u7684\u884c\u3002<\/p>\n
5. \u7d22\u5f15\u7684\u9078\u64c7\u6027\u5dee<\/h2>\n
\u7d22\u5f15\u7684\u9078\u64c7\u6027\u662f\u6307\u7d22\u5f15\u4e2d\u552f\u4e00\u503c\u7684\u6bd4\u4f8b\u3002\u5982\u679c\u7d22\u5f15\u7684\u9078\u64c7\u6027\u5dee\uff0c\u5247 MySQL \u53ef\u80fd\u6703\u9078\u64c7\u4e0d\u4f7f\u7528\u8a72\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4e00\u500b\u5217\u7684\u503c\u5927\u90e8\u5206\u90fd\u662f\u76f8\u540c\u7684\uff0c\u90a3\u9ebc\u9019\u500b\u5217\u7684\u7d22\u5f15\u9078\u64c7\u6027\u5c31\u5f88\u4f4e\uff0c\u9019\u6a23\u5728\u67e5\u8a62\u6642\u53ef\u80fd\u6703\u5c0e\u81f4\u5168\u8868\u6383\u63cf\u3002<\/p>\n
6. \u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c<\/h2>\n
\u5728\u9032\u884c\u5927\u91cf\u7684\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u5f8c\uff0c\u7d22\u5f15\u53ef\u80fd\u6703\u8b8a\u5f97\u4e0d\u518d\u6709\u6548\u3002\u9019\u662f\u56e0\u70ba\u5728\u9019\u4e9b\u64cd\u4f5c\u4e2d\uff0c\u7d22\u5f15\u9700\u8981\u4e0d\u65b7\u5730\u88ab\u66f4\u65b0\uff0c\u9019\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u5b9a\u671f\u91cd\u5efa\u7d22\u5f15\u53ef\u4ee5\u5e6b\u52a9\u6539\u5584\u9019\u7a2e\u60c5\u6cc1\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u4e86\u89e3 MySQL \u7d22\u5f15\u5931\u6548\u7684\u539f\u56e0\u5c0d\u65bc\u6578\u64da\u5eab\u6027\u80fd\u7684\u512a\u5316\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u907f\u514d\u4e0d\u7576\u7684\u67e5\u8a62\u689d\u4ef6\u3001\u51fd\u6578\u4f7f\u7528\u3001\u4e0d\u4e00\u81f4\u7684\u6578\u64da\u985e\u578b\u6bd4\u8f03\u3001OR \u689d\u4ef6\u3001\u4f4e\u9078\u64c7\u6027\u7684\u7d22\u5f15\u4ee5\u53ca\u5b9a\u671f\u7dad\u8b77\u7d22\u5f15\uff0c\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 VPS<\/a> \u65b9\u6848\u548c\u512a\u5316\u6578\u64da\u5eab\u8a2d\u8a08\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u6b65\u9a5f\u3002\u5e0c\u671b\u672c\u6587\u80fd\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3 MySQL \u7d22\u5f15\u7684\u4f7f\u7528\u53ca\u5176\u6f5b\u5728\u554f\u984c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3 MySQL \u7d22\u5f15\u5931\u6548\u7684\u60c5\u6cc1\uff0c\u5305\u62ec\u4e0d\u7576\u67e5\u8a62\u3001\u6578\u64da\u985e\u578b\u4e0d\u5339\u914d\u53ca\u7d22\u5f15\u9078\u64c7\u4e0d\u7576\uff0c\u52a9\u4f60\u5728\u9762\u8a66\u4e2d\u812b\u7a4e\u800c\u51fa\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-169017","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/169017","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=169017"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/169017\/revisions"}],"predecessor-version":[{"id":169018,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/169017\/revisions\/169018"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=169017"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=169017"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=169017"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}