{"id":5672,"date":"2024-11-14T11:26:12","date_gmt":"2024-11-14T03:26:12","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5672\/"},"modified":"2024-11-14T11:26:12","modified_gmt":"2024-11-14T03:26:12","slug":"sql%e6%80%8e%e4%b9%88%e6%b8%85%e7%a9%ba%e4%b8%80%e4%b8%aa%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5672\/","title":{"rendered":"sql\u600e\u4e48\u6e05\u7a7a\u4e00\u4e2a\u8868"},"content":{"rendered":"

\n \u6e05\u7a7a sql \u8868\u6709\u4e09\u79cd\u4e3b\u8981\u65b9\u6cd5\uff1adelete \u8bed\u53e5\u53ef\u63d0\u4f9b\u66f4\u7cbe\u786e\u7684\u63a7\u5236\uff0ctruncate \u8bed\u53e5\u901f\u5ea6\u66f4\u5feb\u4e14\u4e0d\u53ef\u56de\u6eda\uff0cupdate \u8bed\u53e5\u53ef\u9009\u62e9\u6027\u5730\u8bbe\u7f6e\u5217\u4e3a null\u3002\u9009\u62e9\u65b9\u6cd5\u65f6\uff0c\u5e94\u8003\u8651\u7279\u5b9a\u9700\u6c42\u548c\u6027\u80fd\u56e0\u7d20\u3002\n<\/p><\/blockquote>\n

\"sql\u600e\u4e48\u6e05\u7a7a\u4e00\u4e2a\u8868\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u6e05\u7a7a SQL \u8868<\/strong><\/p>\n

\u65b9\u6cd5 1\uff1a\u4f7f\u7528 DELETE \u8bed\u53e5<\/strong><\/p>\n

\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 DELETE \u8bed\u53e5\uff0c\u8be5\u8bed\u53e5\u5c06\u5220\u9664\u8868\u4e2d\u6240\u6709\u884c\u3002<\/p>\n

DELETE FROM table_name;<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u65b9\u6cd5 2\uff1a\u4f7f\u7528 TRUNCATE \u8bed\u53e5<\/strong><\/p>\n
TRUNCATE \u8bed\u53e5\u6bd4 DELETE \u8bed\u53e5\u66f4\u5feb\uff0c\u56e0\u4e3a\u5b83\u4f1a\u7acb\u5373\u622a\u65ad\u8868\uff0c\u91ca\u653e\u5b58\u50a8\u7a7a\u95f4\u3002\u4f46\u662f\uff0cTRUNCATE \u64cd\u4f5c\u65e0\u6cd5\u56de\u6eda\uff0c\u56e0\u6b64\u5728\u4f7f\u7528\u65f6\u9700\u8981\u8c28\u614e\u3002<\/p>\n
TRUNCATE TABLE table_name;<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u65b9\u6cd5 3\uff1a\u4f7f\u7528 UPDATE \u8bed\u53e5<\/strong><\/p>\n
\u53ef\u4ee5\u4f7f\u7528 UPDATE \u8bed\u53e5\u5c06\u8868\u4e2d\u6240\u6709\u884c\u7684\u7279\u5b9a\u5217\u8bbe\u7f6e\u4e3a NULL\uff0c\u4ece\u800c\u6e05\u7a7a\u8868\u3002<\/p>\n
UPDATE table_name SET column_name = NULL;<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u4f7f\u7528\u54ea\u79cd\u65b9\u6cd5\uff1f<\/strong><\/p>\n
    \n
  •  DELETE \u8bed\u53e5\uff1a<\/strong>\u6700\u901a\u7528\uff0c\u53ef\u4ee5\u66f4\u7cbe\u786e\u5730\u63a7\u5236\u5220\u9664\u5185\u5bb9\u3002<\/li>\n
  •  TRUNCATE \u8bed\u53e5\uff1a<\/strong>\u66f4\u5feb\u66f4\u7b80\u5355\uff0c\u4f46\u4e0d\u53ef\u56de\u6eda\u3002<\/li>\n
  •  UPDATE \u8bed\u53e5\uff1a<\/strong>\u53ef\u4ee5\u66f4\u7cbe\u786e\u5730\u9009\u62e9\u8981\u5220\u9664\u7684\u5217\u3002<\/li>\n<\/ul>\n
    \u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u7279\u5b9a\u9700\u6c42\u548c\u6027\u80fd\u8003\u8651\u3002<\/p>\n
    \u4ee5\u4e0a\u5c31\u662fsql\u600e\u4e48\u6e05\u7a7a\u4e00\u4e2a\u8868\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":"
    \u6e05\u7a7a sql \u8868\u6709\u4e09\u79cd\u4e3b\u8981\u65b9\u6cd5\uff1adelete \u8bed\u53e5\u53ef\u63d0\u4f9b\u66f4\u7cbe\u786e\u7684\u63a7\u5236\uff0ctruncate \u8bed\u53e5\u901f\u5ea6\u66f4\u5feb\u4e14\u4e0d\u53ef\u56de\u6eda\uff0cupdate \u8bed\u53e5\u53ef\u9009\u62e9\u6027\u5730\u8bbe\u7f6e\u5217\u4e3a null\u3002\u9009\u62e9\u65b9\u6cd5\u65f6\uff0c\u5e94\u8003\u8651\u7279\u5b9a\u9700\u6c42\u548c\u6027\u80fd\u56e0\u7d20\u3002 \u5982\u4f55\u6e05\u7a7a SQL \u8868 \u65b9\u6cd5 1\uff1a\u4f7f\u7528 DELETE \u8bed\u53e5 \u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 DELETE \u8bed\u53e5\uff0c\u8be5\u8bed\u53e5\u5c06\u5220\u9664\u8868\u4e2d\u6240\u6709\u884c\u3002 DELETE FROM table_name; \u767b\u5f55\u540e\u590d\u5236 \u65b9\u6cd5 2\uff1a\u4f7f\u7528 TRUNCATE \u8bed\u53e5 TRUNCATE \u8bed\u53e5\u6bd4 DELETE \u8bed\u53e5\u66f4\u5feb\uff0c\u56e0\u4e3a\u5b83\u4f1a\u7acb\u5373\u622a\u65ad\u8868\uff0c\u91ca\u653e\u5b58\u50a8\u7a7a\u95f4\u3002\u4f46\u662f\uff0cTRUNCATE \u64cd\u4f5c\u65e0\u6cd5\u56de\u6eda\uff0c\u56e0\u6b64\u5728\u4f7f\u7528\u65f6\u9700\u8981\u8c28\u614e\u3002 TRUNCATE TABLE table_name; \u767b\u5f55\u540e\u590d\u5236 \u65b9\u6cd5 3\uff1a\u4f7f\u7528 UPDATE \u8bed\u53e5 \u53ef\u4ee5\u4f7f\u7528 UPDATE \u8bed\u53e5\u5c06\u8868\u4e2d\u6240\u6709\u884c\u7684\u7279\u5b9a\u5217\u8bbe\u7f6e\u4e3a NULL\uff0c\u4ece\u800c\u6e05\u7a7a\u8868\u3002 UPDATE table_name SET column_name = NULL; \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528\u54ea\u79cd\u65b9\u6cd5\uff1f DELETE \u8bed\u53e5\uff1a\u6700\u901a\u7528\uff0c\u53ef\u4ee5\u66f4\u7cbe\u786e\u5730\u63a7\u5236\u5220\u9664\u5185\u5bb9\u3002 TRUNCATE \u8bed\u53e5\uff1a\u66f4\u5feb\u66f4\u7b80\u5355\uff0c\u4f46\u4e0d\u53ef\u56de\u6eda\u3002 UPDATE […]<\/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-5672","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5672","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=5672"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5672\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5672"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5672"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5672"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}