{"id":5955,"date":"2024-11-14T14:24:11","date_gmt":"2024-11-14T06:24:11","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5955\/"},"modified":"2024-11-14T14:24:11","modified_gmt":"2024-11-14T06:24:11","slug":"sql%e5%a6%82%e4%bd%95%e6%b8%85%e7%90%86%e7%89%b9%e5%ae%9a%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5955\/","title":{"rendered":"sql\u5982\u4f55\u6e05\u7406\u7279\u5b9a\u6570\u636e"},"content":{"rendered":"

\n \u4f7f\u7528sql\u6e05\u7406\u7279\u5b9a\u6570\u636e\u7684\u65b9\u6cd5\uff1a\u786e\u5b9a\u8981\u6e05\u7406\u7684\u6570\u636e\u3002\u4f7f\u7528delete\u8bed\u53e5\u6309\u6761\u4ef6\u5220\u9664\u6570\u636e\u3002\u4f7f\u7528truncate\u8bed\u53e5\u5feb\u901f\u5220\u9664\u8868\u4e2d\u6240\u6709\u6570\u636e\uff08\u8c28\u614e\u4f7f\u7528\uff09\u3002\u4f18\u5316\u67e5\u8be2\u4ee5\u63d0\u9ad8\u6548\u7387\u3002\u6e05\u7406\u524d\u8fdb\u884c\u6570\u636e\u5907\u4efd\u3002\n<\/p><\/blockquote>\n

\"sql\u5982\u4f55\u6e05\u7406\u7279\u5b9a\u6570\u636e\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u901a\u8fc7SQL\u6e05\u7406\u7279\u5b9a\u6570\u636e<\/strong><\/p>\n

\u5728\u7ef4\u62a4\u6570\u636e\u5e93\u65f6\uff0c\u5b9a\u671f\u6e05\u7406\u4e0d\u518d\u9700\u8981\u7684\u6570\u636e\u81f3\u5173\u91cd\u8981\uff0c\u4ee5\u4f18\u5316\u6027\u80fd\u548c\u8282\u7701\u5b58\u50a8\u7a7a\u95f4\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528SQL\u6e05\u7406\u7279\u5b9a\u6570\u636e\u7684\u65b9\u6cd5\uff1a<\/p>\n

1. \u6807\u8bc6\u8981\u6e05\u7406\u7684\u6570\u636e<\/strong><\/p>\n

\u786e\u5b9a\u8981\u5220\u9664\u7684\u6570\u636e\u7684\u8303\u56f4\uff0c\u5373\u8868\u3001\u5217\u548c\u7279\u5b9a\u7684\u6761\u4ef6\u3002\u4f8b\u5982\uff0c\u8981\u5220\u9664\u8d85\u8fc7\u4e00\u5e74\u672a\u6d3b\u52a8\u7684\u7528\u6237\u8bb0\u5f55\uff0c\u5219\u67e5\u8be2\u6761\u4ef6\u5e94\u8be5\u662f last_activity_date <\/p>\n

2. \u4f7f\u7528DELETE\u8bed\u53e5<\/strong><\/p>\n

\u4f7f\u7528DELETE\u8bed\u53e5\u5220\u9664\u6ee1\u8db3\u7ed9\u5b9a\u6761\u4ef6\u7684\u884c\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

DELETE FROM table_name\nWHERE condition;<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8be2\u5c06\u5220\u9664\u8d85\u8fc7\u4e00\u5e74\u672a\u6d3b\u52a8\u7684\u7528\u6237\u8bb0\u5f55\uff1a<\/p>\n
DELETE FROM users\nWHERE last_activity_date < DATE_SUB(NOW(), INTERVAL 1 YEAR);<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
3. \u4f7f\u7528TRUNCATE\u8bed\u53e5\uff08\u53ef\u9009\uff09<\/strong><\/p>\n
TRUNCATE\u8bed\u53e5\u6bd4DELETE\u8bed\u53e5\u66f4\u5feb\uff0c\u56e0\u4e3a\u5b83\u5220\u9664\u4e86\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u800c\u4e0d\u4f7f\u7528\u4e8b\u52a1\u65e5\u5fd7\u3002\u4f46\u662f\uff0cTRUNCATE\u4e0d\u80fd\u64a4\u6d88\uff0c\u56e0\u6b64\u8c28\u614e\u4f7f\u7528\u3002<\/p>\n
\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n
TRUNCATE TABLE table_name;<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
4. \u4f18\u5316\u67e5\u8be2<\/strong><\/p>\n
\u4e3a\u4e86\u63d0\u9ad8\u6e05\u7406\u6548\u7387\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6280\u5de7\uff1a<\/p>\n
    \n
  • \u4f7f\u7528\u7d22\u5f15\u6765\u63d0\u9ad8\u6761\u4ef6\u7684\u68c0\u7d22\u901f\u5ea6\u3002<\/li>\n
  • \u4f7f\u7528\u6279\u91cf\u5220\u9664\u6280\u672f\uff0c\u4e00\u6b21\u5220\u9664\u5927\u91cf\u884c\u3002<\/li>\n
  • \u5728\u975e\u9ad8\u5cf0\u65f6\u6bb5\u6267\u884c\u6e05\u7406\u4efb\u52a1\u3002<\/li>\n<\/ul>\n
    5. \u5907\u4efd\u6570\u636e<\/strong><\/p>\n
    \u5728\u6e05\u7406\u6570\u636e\u4e4b\u524d\uff0c\u8bf7\u52a1\u5fc5\u5907\u4efd\u6570\u636e\u4ee5\u9632\u610f\u5916\u60c5\u51b5\u53d1\u751f\u3002<\/p>\n
    \u6ce8\u610f\uff1a<\/strong><\/p>\n
      \n
    • \u5728\u6267\u884c\u6e05\u7406\u64cd\u4f5c\u4e4b\u524d\uff0c\u8bf7\u59cb\u7ec8\u68c0\u67e5\u67e5\u8be2\u5e76\u786e\u4fdd\u6761\u4ef6\u6b63\u786e\u65e0\u8bef\u3002<\/li>\n
    • \u6e05\u7406\u6570\u636e\u540e\uff0c\u8bf7\u91cd\u5efa\u53d7\u5f71\u54cd\u7684\u7d22\u5f15\u4ee5\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u3002<\/li>\n<\/ul>\n
      \u4ee5\u4e0a\u5c31\u662fsql\u5982\u4f55\u6e05\u7406\u7279\u5b9a\u6570\u636e\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":"
      \u4f7f\u7528sql\u6e05\u7406\u7279\u5b9a\u6570\u636e\u7684\u65b9\u6cd5\uff1a\u786e\u5b9a\u8981\u6e05\u7406\u7684\u6570\u636e\u3002\u4f7f\u7528delete\u8bed\u53e5\u6309\u6761\u4ef6\u5220\u9664\u6570\u636e\u3002\u4f7f\u7528truncate\u8bed\u53e5\u5feb\u901f\u5220\u9664\u8868\u4e2d\u6240\u6709\u6570\u636e\uff08\u8c28\u614e\u4f7f\u7528\uff09\u3002\u4f18\u5316\u67e5\u8be2\u4ee5\u63d0\u9ad8\u6548\u7387\u3002\u6e05\u7406\u524d\u8fdb\u884c\u6570\u636e\u5907\u4efd\u3002 \u5982\u4f55\u901a\u8fc7SQL\u6e05\u7406\u7279\u5b9a\u6570\u636e \u5728\u7ef4\u62a4\u6570\u636e\u5e93\u65f6\uff0c\u5b9a\u671f\u6e05\u7406\u4e0d\u518d\u9700\u8981\u7684\u6570\u636e\u81f3\u5173\u91cd\u8981\uff0c\u4ee5\u4f18\u5316\u6027\u80fd\u548c\u8282\u7701\u5b58\u50a8\u7a7a\u95f4\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528SQL\u6e05\u7406\u7279\u5b9a\u6570\u636e\u7684\u65b9\u6cd5\uff1a 1. \u6807\u8bc6\u8981\u6e05\u7406\u7684\u6570\u636e \u786e\u5b9a\u8981\u5220\u9664\u7684\u6570\u636e\u7684\u8303\u56f4\uff0c\u5373\u8868\u3001\u5217\u548c\u7279\u5b9a\u7684\u6761\u4ef6\u3002\u4f8b\u5982\uff0c\u8981\u5220\u9664\u8d85\u8fc7\u4e00\u5e74\u672a\u6d3b\u52a8\u7684\u7528\u6237\u8bb0\u5f55\uff0c\u5219\u67e5\u8be2\u6761\u4ef6\u5e94\u8be5\u662f last_activity_date 2. \u4f7f\u7528DELETE\u8bed\u53e5 \u4f7f\u7528DELETE\u8bed\u53e5\u5220\u9664\u6ee1\u8db3\u7ed9\u5b9a\u6761\u4ef6\u7684\u884c\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a DELETE FROM table_name WHERE condition; \u767b\u5f55\u540e\u590d\u5236 \u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8be2\u5c06\u5220\u9664\u8d85\u8fc7\u4e00\u5e74\u672a\u6d3b\u52a8\u7684\u7528\u6237\u8bb0\u5f55\uff1a DELETE FROM users WHERE last_activity_date < DATE_SUB(NOW(), INTERVAL 1 YEAR); \u767b\u5f55\u540e\u590d\u5236 3. \u4f7f\u7528TRUNCATE\u8bed\u53e5\uff08\u53ef\u9009\uff09 TRUNCATE\u8bed\u53e5\u6bd4DELETE\u8bed\u53e5\u66f4\u5feb\uff0c\u56e0\u4e3a\u5b83\u5220\u9664\u4e86\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u800c\u4e0d\u4f7f\u7528\u4e8b\u52a1\u65e5\u5fd7\u3002\u4f46\u662f\uff0cTRUNCATE\u4e0d\u80fd\u64a4\u6d88\uff0c\u56e0\u6b64\u8c28\u614e\u4f7f\u7528\u3002 \u8bed\u6cd5\u5982\u4e0b\uff1a TRUNCATE TABLE table_name; \u767b\u5f55\u540e\u590d\u5236 4. \u4f18\u5316\u67e5\u8be2 \u4e3a\u4e86\u63d0\u9ad8\u6e05\u7406\u6548\u7387\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6280\u5de7\uff1a \u4f7f\u7528\u7d22\u5f15\u6765\u63d0\u9ad8\u6761\u4ef6\u7684\u68c0\u7d22\u901f\u5ea6\u3002 \u4f7f\u7528\u6279\u91cf\u5220\u9664\u6280\u672f\uff0c\u4e00\u6b21\u5220\u9664\u5927\u91cf\u884c\u3002 \u5728\u975e\u9ad8\u5cf0\u65f6\u6bb5\u6267\u884c\u6e05\u7406\u4efb\u52a1\u3002 5. \u5907\u4efd\u6570\u636e \u5728\u6e05\u7406\u6570\u636e\u4e4b\u524d\uff0c\u8bf7\u52a1\u5fc5\u5907\u4efd\u6570\u636e\u4ee5\u9632\u610f\u5916\u60c5\u51b5\u53d1\u751f\u3002 \u6ce8\u610f\uff1a \u5728\u6267\u884c\u6e05\u7406\u64cd\u4f5c\u4e4b\u524d\uff0c\u8bf7\u59cb\u7ec8\u68c0\u67e5\u67e5\u8be2\u5e76\u786e\u4fdd\u6761\u4ef6\u6b63\u786e\u65e0\u8bef\u3002 \u6e05\u7406\u6570\u636e\u540e\uff0c\u8bf7\u91cd\u5efa\u53d7\u5f71\u54cd\u7684\u7d22\u5f15\u4ee5\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u3002 \u4ee5\u4e0a\u5c31\u662fsql\u5982\u4f55\u6e05\u7406\u7279\u5b9a\u6570\u636e\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},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5955","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5955","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=5955"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5955\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5955"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5955"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5955"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}