{"id":5640,"date":"2024-11-14T12:43:47","date_gmt":"2024-11-14T04:43:47","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5640\/"},"modified":"2024-11-14T12:43:47","modified_gmt":"2024-11-14T04:43:47","slug":"sql%e5%a4%9a%e8%a1%a8%e8%81%94%e6%9f%a5%e6%80%8e%e4%b9%88%e7%94%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5640\/","title":{"rendered":"sql\u591a\u8868\u8054\u67e5\u600e\u4e48\u7528"},"content":{"rendered":"

\n \u591a\u8868\u8054\u67e5\u5728 sql \u4e2d\u5c06\u591a\u4e2a\u8868\u5173\u8054\u8d77\u6765\uff0c\u4ee5\u4fbf\u63d0\u53d6\u6570\u636e\u3002\u6b65\u9aa4\u5305\u62ec\uff1a\u786e\u5b9a\u8868\u3001\u9009\u62e9\u5173\u8054\u5b57\u6bb5\u3001\u6307\u5b9a\u8054\u67e5\u7c7b\u578b\uff08inner join\u3001left join\u3001right join\u3001full join\uff09\u548c\u7f16\u5199\u67e5\u8be2\u3002\u793a\u4f8b\uff1a\u8054\u67e5\u5ba2\u6237\u8868\u548c\u8ba2\u5355\u8868\u53ef\u63d0\u53d6\u6bcf\u4f4d\u5ba2\u6237\u7684\u8ba2\u5355\u4fe1\u606f\u3002\n<\/p><\/blockquote>\n

\"sql\u591a\u8868\u8054\u67e5\u600e\u4e48\u7528\u63d2\u56fe\"<\/p>\n

SQL \u591a\u8868\u8054\u67e5\u6307\u5357<\/strong><\/p>\n

\u591a\u8868\u8054\u67e5<\/strong>\u662f\u5c06\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u6570\u636e\u5173\u8054\u8d77\u6765\u7684\u6280\u672f\uff0c\u4ee5\u4fbf\u83b7\u53d6\u9700\u8981\u7684\u4fe1\u606f\u3002\u5728 SQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\u8fdb\u884c\u591a\u8868\u8054\u67e5\uff1a<\/p>\n

SELECT * FROM \u88681\nINNER JOIN \u88682 ON \u88681.\u5b57\u6bb5 = \u88682.\u5b57\u6bb5<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u6b65\u9aa4\uff1a<\/strong><\/p>\n
    \n
  1.  \u786e\u5b9a\u8981\u8054\u67e5\u7684\u8868\uff1a<\/strong>\u8bc6\u522b\u5305\u542b\u6240\u9700\u4fe1\u606f\u7684\u8868\u3002<\/li>\n
  2.  \u9009\u62e9\u8981\u5173\u8054\u7684\u5b57\u6bb5\uff1a<\/strong>\u786e\u5b9a\u6bcf\u4e2a\u8868\u4e2d\u7528\u4e8e\u5173\u8054\u6570\u636e\u7684\u5b57\u6bb5\u3002<\/li>\n
  3.  \u6307\u5b9a\u8054\u67e5\u7c7b\u578b\uff1a<\/strong>\u9009\u62e9 INNER JOIN\u3001LEFT JOIN \u6216 RIGHT JOIN \u7b49\u8054\u67e5\u7c7b\u578b\u3002<\/li>\n
  4.  \u7f16\u5199 SQL \u67e5\u8be2\uff1a<\/strong>\u4f7f\u7528 JOIN \u8bed\u6cd5\u5c06\u8868\u8054\u67e5\u8d77\u6765\u3002<\/li>\n<\/ol>\n
    \u8054\u67e5\u7c7b\u578b\uff1a<\/strong><\/p>\n
      \n
    •  INNER JOIN\uff1a<\/strong>\u53ea\u6709\u5339\u914d\u7684\u8bb0\u5f55\u624d\u4f1a\u8fd4\u56de\u3002<\/li>\n
    •  LEFT JOIN\uff1a<\/strong>\u8fd4\u56de\u6765\u81ea\u5de6\u8868\u7684\u5168\u90e8\u8bb0\u5f55\uff0c\u5373\u4f7f\u53f3\u8868\u6ca1\u6709\u5339\u914d\u7684\u8bb0\u5f55\u3002<\/li>\n
    •  RIGHT JOIN\uff1a<\/strong>\u8fd4\u56de\u6765\u81ea\u53f3\u8868\u7684\u5168\u90e8\u8bb0\u5f55\uff0c\u5373\u4f7f\u5de6\u8868\u6ca1\u6709\u5339\u914d\u7684\u8bb0\u5f55\u3002<\/li>\n
    •  FULL JOIN\uff1a<\/strong>\u8fd4\u56de\u6765\u81ea\u4e24\u4e2a\u8868\u7684\u5168\u90e8\u8bb0\u5f55\uff0c\u65e0\u8bba\u662f\u5426\u6709\u5339\u914d\u7684\u8bb0\u5f55\u3002<\/li>\n<\/ul>\n
      \u793a\u4f8b\uff1a<\/strong><\/p>\n
      \u5047\u8bbe\u6709\u4e0b\u9762\u4e24\u4e2a\u8868\uff1a<\/p>\n
      \u5ba2\u6237\u8868\uff1a<\/strong><\/p>\n\n\n\n\n\n\n\n
      \u5ba2\u6237 ID<\/th>\n\u5ba2\u6237\u59d3\u540d<\/th>\n<\/tr>\n<\/thead>\n
      1<\/td>\n\u7ea6\u7ff0\u53f2\u5bc6\u65af<\/td>\n<\/tr>\n
      2<\/td>\n\u739b\u4e3d\u7ea6\u7ff0\u900a<\/td>\n<\/tr>\n
      3<\/td>\n\u6234\u7ef4\u743c\u65af<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
      \u8ba2\u5355\u8868\uff1a<\/strong><\/p>\n\n\n\n\n\n\n\n
      \u8ba2\u5355 ID<\/th>\n\u5ba2\u6237 ID<\/th>\n\u4ea7\u54c1\u540d\u79f0<\/th>\n<\/tr>\n<\/thead>\n
      1<\/td>\n1<\/td>\niPhone<\/td>\n<\/tr>\n
      2<\/td>\n2<\/td>\nMacBook<\/td>\n<\/tr>\n
      3<\/td>\n3<\/td>\niPad<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
      \u8981\u83b7\u53d6\u6bcf\u4e2a\u5ba2\u6237\u7684\u8ba2\u5355\u4fe1\u606f\uff0c\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u591a\u8868\u8054\u67e5\u67e5\u8be2\uff1a<\/p>\n
      SELECT *\nFROM \u5ba2\u6237\u8868\nINNER JOIN \u8ba2\u5355\u8868 ON \u5ba2\u6237\u8868.\u5ba2\u6237 ID = \u8ba2\u5355\u8868.\u5ba2\u6237 ID;<\/pre>\n
        \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
      \u8f93\u51fa\uff1a<\/strong><\/p>\n\n\n\n\n\n\n\n
      \u5ba2\u6237 ID<\/th>\n\u5ba2\u6237\u59d3\u540d<\/th>\n\u8ba2\u5355 ID<\/th>\n\u4ea7\u54c1\u540d\u79f0<\/th>\n<\/tr>\n<\/thead>\n
      1<\/td>\n\u7ea6\u7ff0\u53f2\u5bc6\u65af<\/td>\n1<\/td>\niPhone<\/td>\n<\/tr>\n
      2<\/td>\n\u739b\u4e3d\u7ea6\u7ff0\u900a<\/td>\n2<\/td>\nMacBook<\/td>\n<\/tr>\n
      3<\/td>\n\u6234\u7ef4\u743c\u65af<\/td>\n3<\/td>\niPad<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
      \u4ee5\u4e0a\u5c31\u662fsql\u591a\u8868\u8054\u67e5\u600e\u4e48\u7528\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":"
      \u591a\u8868\u8054\u67e5\u5728 sql \u4e2d\u5c06\u591a\u4e2a\u8868\u5173\u8054\u8d77\u6765\uff0c\u4ee5\u4fbf\u63d0\u53d6\u6570\u636e\u3002\u6b65\u9aa4\u5305\u62ec\uff1a\u786e\u5b9a\u8868\u3001\u9009\u62e9\u5173\u8054\u5b57\u6bb5\u3001\u6307\u5b9a\u8054\u67e5\u7c7b\u578b\uff08inner join\u3001left join\u3001right join\u3001full join\uff09\u548c\u7f16\u5199\u67e5\u8be2\u3002\u793a\u4f8b\uff1a\u8054\u67e5\u5ba2\u6237\u8868\u548c\u8ba2\u5355\u8868\u53ef\u63d0\u53d6\u6bcf\u4f4d\u5ba2\u6237\u7684\u8ba2\u5355\u4fe1\u606f\u3002 SQL \u591a\u8868\u8054\u67e5\u6307\u5357 \u591a\u8868\u8054\u67e5\u662f\u5c06\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u6570\u636e\u5173\u8054\u8d77\u6765\u7684\u6280\u672f\uff0c\u4ee5\u4fbf\u83b7\u53d6\u9700\u8981\u7684\u4fe1\u606f\u3002\u5728 SQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\u8fdb\u884c\u591a\u8868\u8054\u67e5\uff1a SELECT * FROM \u88681 INNER JOIN \u88682 ON \u88681.\u5b57\u6bb5 = \u88682.\u5b57\u6bb5 \u767b\u5f55\u540e\u590d\u5236 \u6b65\u9aa4\uff1a \u786e\u5b9a\u8981\u8054\u67e5\u7684\u8868\uff1a\u8bc6\u522b\u5305\u542b\u6240\u9700\u4fe1\u606f\u7684\u8868\u3002 \u9009\u62e9\u8981\u5173\u8054\u7684\u5b57\u6bb5\uff1a\u786e\u5b9a\u6bcf\u4e2a\u8868\u4e2d\u7528\u4e8e\u5173\u8054\u6570\u636e\u7684\u5b57\u6bb5\u3002 \u6307\u5b9a\u8054\u67e5\u7c7b\u578b\uff1a\u9009\u62e9 INNER JOIN\u3001LEFT JOIN \u6216 RIGHT JOIN \u7b49\u8054\u67e5\u7c7b\u578b\u3002 \u7f16\u5199 SQL \u67e5\u8be2\uff1a\u4f7f\u7528 JOIN \u8bed\u6cd5\u5c06\u8868\u8054\u67e5\u8d77\u6765\u3002 \u8054\u67e5\u7c7b\u578b\uff1a INNER JOIN\uff1a\u53ea\u6709\u5339\u914d\u7684\u8bb0\u5f55\u624d\u4f1a\u8fd4\u56de\u3002 LEFT JOIN\uff1a\u8fd4\u56de\u6765\u81ea\u5de6\u8868\u7684\u5168\u90e8\u8bb0\u5f55\uff0c\u5373\u4f7f\u53f3\u8868\u6ca1\u6709\u5339\u914d\u7684\u8bb0\u5f55\u3002 RIGHT JOIN\uff1a\u8fd4\u56de\u6765\u81ea\u53f3\u8868\u7684\u5168\u90e8\u8bb0\u5f55\uff0c\u5373\u4f7f\u5de6\u8868\u6ca1\u6709\u5339\u914d\u7684\u8bb0\u5f55\u3002 FULL JOIN\uff1a\u8fd4\u56de\u6765\u81ea\u4e24\u4e2a\u8868\u7684\u5168\u90e8\u8bb0\u5f55\uff0c\u65e0\u8bba\u662f\u5426\u6709\u5339\u914d\u7684\u8bb0\u5f55\u3002 \u793a\u4f8b\uff1a \u5047\u8bbe\u6709\u4e0b\u9762\u4e24\u4e2a\u8868\uff1a \u5ba2\u6237\u8868\uff1a \u5ba2\u6237 ID \u5ba2\u6237\u59d3\u540d […]<\/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-5640","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5640","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=5640"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5640\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5640"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5640"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}