{"id":6292,"date":"2024-11-14T09:30:04","date_gmt":"2024-11-14T01:30:04","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6292\/"},"modified":"2024-11-14T09:30:04","modified_gmt":"2024-11-14T01:30:04","slug":"hackerrank-sql-%e5%87%86%e5%a4%87%ef%bc%9a%e5%85%a8%e9%80%89mysql","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6292\/","title":{"rendered":"HackerRank SQL \u51c6\u5907\uff1a\u5168\u9009(MySQL)"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/000\/887\/227\/172058662018681.jpg\" class=\"aligncenter\" title=\"HackerRank SQL \u51c6\u5907\uff1a\u5168\u9009(MySQL)\u63d2\u56fe\" alt=\"HackerRank SQL \u51c6\u5907\uff1a\u5168\u9009(MySQL)\u63d2\u56fe\" \/><\/p>\n<p><strong>\u95ee\u9898\u9648\u8ff0\uff1a<\/strong><br \/> \u67e5\u8be2 <strong>CITY<\/strong> \u8868\u4e2d\u6bcf\u4e00\u884c\u7684\u6240\u6709\u5217\uff08\u5c5e\u6027\uff09\u3002<\/p>\n<hr>\n<p><strong>\u94fe\u63a5\uff1a<\/strong> HackerRank &#8211; \u9009\u62e9\u6240\u6709 SQL<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6848\uff1a<\/strong><\/p>\n<pre>\u4ece\u57ce\u5e02\u9009\u62e9*\uff1b\n<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>\u8bf4\u660e\uff1a<\/strong><\/p>\n<ul>\n<li> SELECT *\uff1a\u661f\u53f7 (*) \u662f SQL \u4e2d\u7684\u901a\u914d\u7b26\uff0c\u8868\u793a\u201c\u6240\u6709\u5217\u201d\u3002\u8fd9\u90e8\u5206\u67e5\u8be2\u6307\u5b9a\u60a8\u8981\u68c0\u7d22\u8868\u4e2d\u7684\u6240\u6709\u5217\u3002<\/li>\n<li> FROM CITY\uff1a\u8868\u793a\u60a8\u6b63\u5728\u4ece <strong>CITY<\/strong> \u8868\u4e2d\u9009\u62e9\u6570\u636e\u3002<\/li>\n<\/ul>\n<p>\u6b64\u67e5\u8be2\u5c06\u8fd4\u56de <strong>CITY<\/strong> \u8868\u4e2d\u6bcf\u4e00\u884c\u7684\u6240\u6709\u5217\u3002\u5f53\u60a8\u9700\u8981\u5728\u6ca1\u6709\u4efb\u4f55\u7279\u5b9a\u8fc7\u6ee4\u6216\u6761\u4ef6\u7684\u60c5\u51b5\u4e0b\u68c0\u67e5\u6216\u5206\u6790\u8868\u4e2d\u53ef\u7528\u7684\u6240\u6709\u6570\u636e\u65f6\uff0c\u5b83\u975e\u5e38\u6709\u7528\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fHackerRank SQL \u51c6\u5907\uff1a\u5168\u9009(MySQL)\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":"<p>\u95ee\u9898\u9648\u8ff0\uff1a \u67e5\u8be2 CITY \u8868\u4e2d\u6bcf\u4e00\u884c\u7684\u6240\u6709\u5217\uff08\u5c5e\u6027\uff09\u3002 \u94fe\u63a5\uff1a HackerRank &#8211; \u9009\u62e9\u6240\u6709 SQL \u89e3\u51b3\u65b9\u6848\uff1a \u4ece\u57ce\u5e02\u9009\u62e9*\uff1b \u767b\u5f55\u540e\u590d\u5236 \u8bf4\u660e\uff1a SELECT *\uff1a\u661f\u53f7 (*) \u662f SQL \u4e2d\u7684\u901a\u914d\u7b26\uff0c\u8868\u793a\u201c\u6240\u6709\u5217\u201d\u3002\u8fd9\u90e8\u5206\u67e5\u8be2\u6307\u5b9a\u60a8\u8981\u68c0\u7d22\u8868\u4e2d\u7684\u6240\u6709\u5217\u3002 FROM CITY\uff1a\u8868\u793a\u60a8\u6b63\u5728\u4ece CITY \u8868\u4e2d\u9009\u62e9\u6570\u636e\u3002 \u6b64\u67e5\u8be2\u5c06\u8fd4\u56de CITY \u8868\u4e2d\u6bcf\u4e00\u884c\u7684\u6240\u6709\u5217\u3002\u5f53\u60a8\u9700\u8981\u5728\u6ca1\u6709\u4efb\u4f55\u7279\u5b9a\u8fc7\u6ee4\u6216\u6761\u4ef6\u7684\u60c5\u51b5\u4e0b\u68c0\u67e5\u6216\u5206\u6790\u8868\u4e2d\u53ef\u7528\u7684\u6240\u6709\u6570\u636e\u65f6\uff0c\u5b83\u975e\u5e38\u6709\u7528\u3002 \u4ee5\u4e0a\u5c31\u662fHackerRank SQL \u51c6\u5907\uff1a\u5168\u9009(MySQL)\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-6292","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6292","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=6292"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6292\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6292"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}