{"id":1237,"date":"2023-06-23T19:56:47","date_gmt":"2023-06-23T11:56:47","guid":{"rendered":"https:\/\/www.kenpai.com\/cms\/1237\/"},"modified":"2023-06-23T19:56:47","modified_gmt":"2023-06-23T11:56:47","slug":"sql%e5%88%a0%e9%99%a4%e8%af%ad%e5%8f%a5%e5%bf%ab%e6%8d%b7%e9%94%ae%e6%b1%87%e6%80%bb","status":"publish","type":"post","link":"https:\/\/www.kenpai.com\/cms\/1237\/","title":{"rendered":"sql\u5220\u9664\u8bed\u53e5\u5feb\u6377\u952e\u6c47\u603b"},"content":{"rendered":"<\/p>\n

\u3000\u3000\u5728\u65e5\u5e38\u5de5\u4f5c\u4e2d\uff0c\u6211\u4eec\u65f6\u5e38\u4f1a\u7528\u5230sql\u5220\u9664\u8bed\u53e5\uff0c\u90a3\u4e48sql\u5220\u9664\u8bed\u53e5\u90fd\u6709\u54ea\u4e9b?\u4e14\u542c\u57a6\u6d3e\u79d1\u6280<\/a><\/span>\u4f01\u670d\u7684\u76f8\u5173\u4ecb\u7ecd~<\/p>\n

\u3000\u30001\u3001delete \u8bed\u53e5<\/strong><\/p>\n

\u3000\u3000\u6b64\u8bed\u53e5\u901a\u5e38\u7528\u4e8e\u5220\u9664\u8868\u4e2d\u7684\u884c\uff0c\u5728\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\u662f\u6bcf\u6b21\u4ece\u8868\u4e2d\u5220\u9664\u4e00\u884c\u3002\u8bed\u6cd5\uff1aDELETE FROM \u8868\u540d\u79f0 WHERE \u5217\u540d\u79f0 = \u503c\uff0c\u5c31\u597d\u6bd4\uff1a\u5220\u9664student\u8868\u4e2d\u59d3\u540d\u4e3a\u5f20\u4e09\u4e30\u7684\u5b66\u751f\u4fe1\u606f-delete from studentwhere name=\u2018\u5f20\u4e09\u4e30\u2019;<\/p>\n

\u3000\u30002\u3001<\/strong>drop\u5220\u9664\u8868<\/strong><\/p>\n

\u3000\u3000\u5220\u9664\u5185\u5bb9\u548c\u5b9a\u4e49\uff0c\u91ca\u653e\u7a7a\u95f4\u3002\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u628a\u6574\u4e2a\u8868\u53bb\u6389.\u4ee5\u540e\u8981\u65b0\u589e\u6570\u636e\u662f\u4e0d\u53ef\u80fd\u7684,\u9664\u975e\u65b0\u589e\u4e00\u4e2a\u8868\u3002drop\u8bed\u53e5\u5c06\u5220\u9664\u8868\u7684\u7ed3\u6784\u88ab\u4f9d\u8d56\u7684\u7ea6\u675f(constrain),\u89e6\u53d1\u5668(trigger)\u7d22\u5f15(index);\u4f9d\u8d56\u4e8e\u8be5\u8868\u7684\u5b58\u50a8\u8fc7\u7a0b\/\u51fd\u6570\u5c06\u88ab\u4fdd\u7559\uff0c\u4f46\u5176\u72b6\u6001\u4f1a\u53d8\u4e3a\uff1ainvalid\u3002<\/p>\n

\u3000\u30003\u3001truncate \u6e05\u7a7a\u8868\u4e2d\u7684\u6570\u636e<\/strong><\/p>\n

\u3000\u3000\u5220\u9664\u5185\u5bb9\u3001\u91ca\u653e\u7a7a\u95f4\u4f46\u4e0d\u5220\u9664\u5b9a\u4e49\u4fdd\u7559\u8868\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u53ea\u662f\u6e05\u7a7a\u8868\u6570\u636e\u800c\u5df2\uff0ctruncate \u4e0d\u80fd\u5220\u9664\u884c\u6570\u636e,\u8981\u5220\u5c31\u8981\u628a\u8868\u6e05\u7a7a\u3002<\/p>\n

\u3000\u3000\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a\u5728\u6570\u636e\u5e93\u4e2d\u6211\u4eec\u65f6\u5e38\u8981\u7528\u5230\u7684\u5220\u9664\u8868\u548c\u5220\u9664\u6570\u636e\uff0c\u5728\u5b9e\u9645\u7684\u64cd\u4f5c\u8fc7\u7a0b\u4e2d\u662f\u6709\u533a\u522b\u7684\uff0c\u5982\u679c\u4e0d\u9700\u8981\u8be5\u8868\uff0c\u7528 drop\uff0c\u5f53\u4f60\u9700\u8981\u4fdd\u7559\u6b64\u8868\uff0c\u4f46\u662f\u9700\u8981\u5220\u9664\u8bb0\u5f55\uff0c\u7528 truncate\uff0c\u5982\u679c\u9700\u8981\u5220\u9664\u90e8\u5206\u8bb0\u5f55\uff0c\u7528delete\u3002runcate table \u5728\u529f\u80fd\u4e0a\u4e0e\u4e0d\u5e26 WHERE\uff0ctruncate \u6bd4 delete\u901f\u5ea6\u5feb\uff0c\u4e14\u4f7f\u7528\u7684\u7cfb\u7edf\u548c\u4e8b\u52a1\u65e5\u5fd7\u8d44\u6e90\u5c11\uff0ctruncate \u64cd\u4f5c\u540e\u7684\u8868\u6bd4Delete\u64cd\u4f5c\u540e\u7684\u8868\u8981\u5feb\u5f97\u591a\u3002<\/p>\n

\u3000\u3000\u4ee5\u4e0a\u5c31\u662fsql\u5220\u9664\u8bed\u53e5\u5feb\u6377\u952e\u6c47\u603b\u7684\u76f8\u5173\u4ecb\u7ecd\u3002<\/p>\n

\u66f4\u591a\u5173\u4e8e\u4e91\u670d\u52a1\u5668\uff0c\u57df\u540d<\/a><\/span>\u6ce8\u518c\uff0c\u865a\u62df\u4e3b\u673a\u7684\u95ee\u9898\uff0c\u8bf7\u8bbf\u95ee\u57a6\u6d3e\u79d1\u6280<\/a><\/span>\u5b98\u7f51\uff1awww.kenpai.com<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

\u5728\u65e5\u5e38\u5de5\u4f5c\u4e2d\uff0c\u6211\u4eec\u65f6\u5e38\u4f1a\u7528\u5230sql\u5220\u9664\u8bed\u53e5\uff0c\u90a3\u4e48sql\u5220\u9664\u8bed\u53e5\u90fd\u6709\u54ea\u4e9b?\u4e14\u542c\u57a6\u6d3e\u79d1\u6280\u4f01\u670d\u7684\u76f8\u5173\u4ecb\u7ecd~ 1\u3001delete \u8bed\u53e5 \u6b64\u8bed\u53e5\u901a\u5e38\u7528\u4e8e\u5220\u9664\u8868\u4e2d\u7684\u884c<\/p>\n","protected":false},"author":3,"featured_media":4348,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[3486],"class_list":["post-1237","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-netinfo","tag-sql"],"_links":{"self":[{"href":"https:\/\/www.kenpai.com\/cms\/wp-json\/wp\/v2\/posts\/1237","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kenpai.com\/cms\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kenpai.com\/cms\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kenpai.com\/cms\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kenpai.com\/cms\/wp-json\/wp\/v2\/comments?post=1237"}],"version-history":[{"count":0,"href":"https:\/\/www.kenpai.com\/cms\/wp-json\/wp\/v2\/posts\/1237\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.kenpai.com\/cms\/wp-json\/wp\/v2\/media\/4348"}],"wp:attachment":[{"href":"https:\/\/www.kenpai.com\/cms\/wp-json\/wp\/v2\/media?parent=1237"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kenpai.com\/cms\/wp-json\/wp\/v2\/categories?post=1237"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kenpai.com\/cms\/wp-json\/wp\/v2\/tags?post=1237"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}