{"id":5950,"date":"2024-11-14T11:40:52","date_gmt":"2024-11-14T03:40:52","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5950\/"},"modified":"2024-11-14T11:40:52","modified_gmt":"2024-11-14T03:40:52","slug":"sql%e5%a6%82%e4%bd%95%e5%88%9b%e5%bb%ba%e8%a7%86%e5%9b%be","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5950\/","title":{"rendered":"sql\u5982\u4f55\u521b\u5efa\u89c6\u56fe"},"content":{"rendered":"

\n \u89c6\u56fe\u662f sql \u4e2d\u7684\u865a\u62df\u8868\uff0c\u4ece\u57fa\u7840\u8868\u4e2d\u6d3e\u751f\u6570\u636e\u3002\u521b\u5efa\u89c6\u56fe\u7684\u6b65\u9aa4\u5305\u62ec\uff1a\u4f7f\u7528 create view \u8bed\u53e5\u6307\u5b9a\u89c6\u56fe\u540d\u79f0\u548c\u4ece\u57fa\u7840\u8868\u4e2d\u9009\u62e9\u7684\u5217\u3002\u53ef\u9009\u5730\u6307\u5b9a\u57fa\u7840\u8868\u4e4b\u95f4\u7684\u8fde\u63a5\u548c\u5e94\u7528\u8fc7\u6ee4\u5668\u3002\u89c6\u56fe\u7b80\u5316\u4e86\u67e5\u8be2\u3001\u589e\u5f3a\u4e86\u6570\u636e\u5b89\u5168\u6027\u3001\u63d0\u9ad8\u4e86\u6027\u80fd\uff0c\u5e76\u62bd\u8c61\u4e86\u57fa\u7840\u8868\u7ed3\u6784\u3002\n<\/p><\/blockquote>\n

\"sql\u5982\u4f55\u521b\u5efa\u89c6\u56fe\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u4f7f\u7528 SQL \u521b\u5efa\u89c6\u56fe<\/strong><\/p>\n

\u5b9a\u4e49\uff1a<\/strong>
\u89c6\u56fe\u5728 SQL \u4e2d\u662f\u865a\u62df\u8868\uff0c\u5b83\u4ece\u4e00\u4e2a\u6216\u591a\u4e2a\u57fa\u7840\u8868\u4e2d\u6d3e\u751f\u6570\u636e\u3002\u5b83\u4e0e\u8868\u4e0d\u540c\uff0c\u56e0\u4e3a\u5b83\u4e0d\u5b58\u50a8\u5b9e\u9645\u6570\u636e\uff0c\u800c\u662f\u6839\u636e\u9700\u8981\u4ece\u57fa\u7840\u8868\u4e2d\u68c0\u7d22\u548c\u663e\u793a\u6570\u636e\u3002<\/p>\n

\u521b\u5efa\u89c6\u56fe\u7684\u6b65\u9aa4\uff1a<\/strong><\/p>\n

1. \u521b\u5efa\u89c6\u56fe\u8bed\u53e5<\/strong><\/p>\n

\u4f7f\u7528 CREATE VIEW \u8bed\u53e5\u521b\u5efa\u89c6\u56fe\u3002\u8be5\u8bed\u53e5\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

CREATE VIEW [schema_name.]view_name AS\nSELECT column1, column2, ...\nFROM table1\n[JOIN table2 ON ...]\n[WHERE condition]<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
2. \u6307\u5b9a\u89c6\u56fe\u540d\u79f0<\/strong><\/p>\n
view_name \u662f\u60a8\u8981\u521b\u5efa\u7684\u89c6\u56fe\u7684\u540d\u79f0\u3002\u89c6\u56fe\u540d\u79f0\u5e94\u9075\u5faa\u4e0e\u8868\u540d\u79f0\u76f8\u540c\u7684\u547d\u540d\u7ea6\u5b9a\u3002<\/p>\n
3. \u9009\u62e9\u8981\u663e\u793a\u7684\u5217<\/strong><\/p>\n
SELECT \u5b50\u53e5\u6307\u5b9a\u8981\u4ece\u57fa\u7840\u8868\u4e2d\u9009\u62e9\u7684\u5217\u3002\u60a8\u53ea\u80fd\u9009\u62e9\u57fa\u7840\u8868\u4e2d\u5b58\u5728\u7684\u5217\u3002<\/p>\n
4. \u6307\u5b9a\u57fa\u7840\u8868<\/strong><\/p>\n
FROM \u5b50\u53e5\u6307\u5b9a\u8981\u7528\u4e8e\u521b\u5efa\u89c6\u56fe\u7684\u57fa\u7840\u8868\u3002<\/p>\n
5. \u4f7f\u7528\u8fde\u63a5\uff08\u53ef\u9009\uff09<\/strong><\/p>\n
\u5982\u679c\u89c6\u56fe\u4ece\u591a\u4e2a\u8868\u4e2d\u6d3e\u751f\u6570\u636e\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528 JOIN \u5b50\u53e5\u5c06\u5b83\u4eec\u8fde\u63a5\u8d77\u6765\u3002<\/p>\n
6. \u5e94\u7528\u8fc7\u6ee4\u5668\uff08\u53ef\u9009\uff09<\/strong><\/p>\n
WHERE \u5b50\u53e5\u53ef\u7528\u4e8e\u5e94\u7528\u8fc7\u6ee4\u5668\uff0c\u4ec5\u8fd4\u56de\u6ee1\u8db3\u6307\u5b9a\u6761\u4ef6\u7684\u884c\u3002<\/p>\n
\u793a\u4f8b\uff1a<\/strong><\/p>\n
\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a customer_view \u7684\u89c6\u56fe\uff0c\u5176\u4e2d\u5305\u542b\u5ba2\u6237\u8868\u7684 customer_id\u3001name \u548c email \u5217\uff1a<\/p>\n
CREATE VIEW customer_view AS\nSELECT customer_id, name, email\nFROM customers;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4f18\u70b9\uff1a<\/strong><\/p>\n
    \n
  • \u7b80\u5316\u67e5\u8be2\uff1a\u89c6\u56fe\u53ef\u4ee5\u7b80\u5316\u7ecf\u5e38\u6267\u884c\u7684\u590d\u6742\u67e5\u8be2\u3002<\/li>\n
  • \u6570\u636e\u5b89\u5168\u6027\uff1a\u89c6\u56fe\u53ef\u4ee5\u9650\u5236\u5bf9\u7684\u8bbf\u95ee\u3002<\/li>\n
  • \u63d0\u9ad8\u6027\u80fd\uff1a\u89c6\u56fe\u53ef\u4ee5\u63d0\u9ad8\u9891\u7e41\u67e5\u8be2\u7684\u6027\u80fd\uff0c\u56e0\u4e3a\u5b83\u907f\u514d\u4e86\u591a\u6b21\u8bbf\u95ee\u57fa\u7840\u8868\u3002<\/li>\n
  • \u6570\u636e\u62bd\u8c61\uff1a\u89c6\u56fe\u53ef\u4ee5\u9690\u85cf\u57fa\u7840\u8868\u7ed3\u6784\u7684\u590d\u6742\u6027\uff0c\u4f7f\u67e5\u8be2\u66f4\u5bb9\u6613\u7f16\u5199\u3002<\/li>\n<\/ul>\n
    \u4ee5\u4e0a\u5c31\u662fsql\u5982\u4f55\u521b\u5efa\u89c6\u56fe\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u89c6\u56fe\u662f sql \u4e2d\u7684\u865a\u62df\u8868\uff0c\u4ece\u57fa\u7840\u8868\u4e2d\u6d3e\u751f\u6570\u636e\u3002\u521b\u5efa\u89c6\u56fe\u7684\u6b65\u9aa4\u5305\u62ec\uff1a\u4f7f\u7528 create view \u8bed\u53e5\u6307\u5b9a\u89c6\u56fe\u540d\u79f0\u548c\u4ece\u57fa\u7840\u8868\u4e2d\u9009\u62e9\u7684\u5217\u3002\u53ef\u9009\u5730\u6307\u5b9a\u57fa\u7840\u8868\u4e4b\u95f4\u7684\u8fde\u63a5\u548c\u5e94\u7528\u8fc7\u6ee4\u5668\u3002\u89c6\u56fe\u7b80\u5316\u4e86\u67e5\u8be2\u3001\u589e\u5f3a\u4e86\u6570\u636e\u5b89\u5168\u6027\u3001\u63d0\u9ad8\u4e86\u6027\u80fd\uff0c\u5e76\u62bd\u8c61\u4e86\u57fa\u7840\u8868\u7ed3\u6784\u3002 \u5982\u4f55\u4f7f\u7528 SQL \u521b\u5efa\u89c6\u56fe \u5b9a\u4e49\uff1a\u89c6\u56fe\u5728 SQL \u4e2d\u662f\u865a\u62df\u8868\uff0c\u5b83\u4ece\u4e00\u4e2a\u6216\u591a\u4e2a\u57fa\u7840\u8868\u4e2d\u6d3e\u751f\u6570\u636e\u3002\u5b83\u4e0e\u8868\u4e0d\u540c\uff0c\u56e0\u4e3a\u5b83\u4e0d\u5b58\u50a8\u5b9e\u9645\u6570\u636e\uff0c\u800c\u662f\u6839\u636e\u9700\u8981\u4ece\u57fa\u7840\u8868\u4e2d\u68c0\u7d22\u548c\u663e\u793a\u6570\u636e\u3002 \u521b\u5efa\u89c6\u56fe\u7684\u6b65\u9aa4\uff1a 1. \u521b\u5efa\u89c6\u56fe\u8bed\u53e5 \u4f7f\u7528 CREATE VIEW \u8bed\u53e5\u521b\u5efa\u89c6\u56fe\u3002\u8be5\u8bed\u53e5\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a CREATE VIEW [schema_name.]view_name AS SELECT column1, column2, … FROM table1 [JOIN table2 ON …] [WHERE condition] \u767b\u5f55\u540e\u590d\u5236 2. \u6307\u5b9a\u89c6\u56fe\u540d\u79f0 view_name \u662f\u60a8\u8981\u521b\u5efa\u7684\u89c6\u56fe\u7684\u540d\u79f0\u3002\u89c6\u56fe\u540d\u79f0\u5e94\u9075\u5faa\u4e0e\u8868\u540d\u79f0\u76f8\u540c\u7684\u547d\u540d\u7ea6\u5b9a\u3002 3. \u9009\u62e9\u8981\u663e\u793a\u7684\u5217 SELECT \u5b50\u53e5\u6307\u5b9a\u8981\u4ece\u57fa\u7840\u8868\u4e2d\u9009\u62e9\u7684\u5217\u3002\u60a8\u53ea\u80fd\u9009\u62e9\u57fa\u7840\u8868\u4e2d\u5b58\u5728\u7684\u5217\u3002 4. \u6307\u5b9a\u57fa\u7840\u8868 FROM \u5b50\u53e5\u6307\u5b9a\u8981\u7528\u4e8e\u521b\u5efa\u89c6\u56fe\u7684\u57fa\u7840\u8868\u3002 5. \u4f7f\u7528\u8fde\u63a5\uff08\u53ef\u9009\uff09 \u5982\u679c\u89c6\u56fe\u4ece\u591a\u4e2a\u8868\u4e2d\u6d3e\u751f\u6570\u636e\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528 JOIN \u5b50\u53e5\u5c06\u5b83\u4eec\u8fde\u63a5\u8d77\u6765\u3002 6. \u5e94\u7528\u8fc7\u6ee4\u5668\uff08\u53ef\u9009\uff09 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5950","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5950","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5950"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5950\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5950"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5950"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5950"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}