{"id":39846,"date":"2025-05-26T10:33:03","date_gmt":"2025-05-26T02:33:03","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/39846.html"},"modified":"2025-05-26T10:33:03","modified_gmt":"2025-05-26T02:33:03","slug":"sql%e6%af%8f%e6%97%a5%e4%b8%80%e9%a2%98%ef%bc%885%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/39846.html","title":{"rendered":"SQL\u6bcf\u65e5\u4e00\u9898\uff085\uff09"},"content":{"rendered":"

\u524d\u8a00：\u4e94\u66f4！\u4e94\u66f4\u7409\u7483！\u4e0d\u5bf9！\u662f，\u4e94\u66f4\u4f69\u53ef！<\/p>\n

\u539f\u59cb\u6570\u636e：<\/p>\n

new_hires<\/p>\n\nreasonother_column1other_column2<\/tr>\n\n\n\n\n\n\n\n\n\n\n\n
\u6821\u56ed\u62db\u8058<\/td>\n\u4fe1\u606f 1<\/td>\n1<\/td>\n<\/tr>\n
\u793e\u4f1a\u62db\u8058<\/td>\n\u4fe1\u606f 2<\/td>\n2<\/td>\n<\/tr>\n
\u5185\u90e8\u63a8\u8350<\/td>\n\u4fe1\u606f 3<\/td>\n3<\/td>\n<\/tr>\n
\u730e\u5934\u63a8\u8350<\/td>\n\u4fe1\u606f 4<\/td>\n4<\/td>\n<\/tr>\n
\u6821\u56ed\u62db\u8058<\/td>\n\u4fe1\u606f 5<\/td>\n5<\/td>\n<\/tr>\n
\u793e\u4f1a\u62db\u8058<\/td>\n\u4fe1\u606f 6<\/td>\n6<\/td>\n<\/tr>\n
\u5185\u90e8\u63a8\u8350<\/td>\n\u4fe1\u606f 7<\/td>\n7<\/td>\n<\/tr>\n
\u730e\u5934\u63a8\u8350<\/td>\n\u4fe1\u606f 8<\/td>\n8<\/td>\n<\/tr>\n
\u6821\u56ed\u62db\u8058<\/td>\n\u4fe1\u606f 9<\/td>\n9<\/td>\n<\/tr>\n
\u793e\u4f1a\u62db\u8058<\/td>\n\u4fe1\u606f 10<\/td>\n10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u9898\u76ee\u4e00：<\/p>\n

\u67e5\u8be2\u65b0\u8fdb\u7c7b\u578b\u4e2d，\u4e0d\u540c\u539f\u56e0\u7684\u5408\u8ba1\u4eba\u6570\u4ee5\u53ca\u4eba\u6570\u6392\u540d\u3002 \u7ed3\u679c\u8f93\u51fa\u539f\u56e0\u3001\u4eba\u6570\u3001\u6392\u540d\u3002<\/p>\n

\u9898\u76ee\u4e8c：<\/p>\n

\u6392\u540d\u7b2c 4 \u7684\u539f\u56e0\u662f\u4ec0\u4e48？\u5bf9\u5e94\u4eba\u6570\u4e3a\u591a\u5c11？ \u586b\u5199\u793a\u4f8b：\u793e\u4f1a\u62db\u8058 20<\/p>\n

\u9898\u76ee\u4e00：\u601d\u8def：\u6392\u540d\u5f53\u7136dense_rank\u6392\u5e8f\u4e86，\u7136\u540e\u5176\u4f59\u76f4\u63a5\u67e5\u8be2\u5c31\u597d<\/p>\n

SELECT
\n reason,
\n COUNT(*) AS num_people,
\n DENSE_RANK() OVER (ORDER BY COUNT(*) DESC) AS rk
\nFROM new_hires
\nGROUP BY reason
\nORDER BY rk; <\/p>\n

\u9898\u76ee\u4e8c：\u641c\u7d22\u5bf9\u5e94rank =4\u7684\u5373\u53ef<\/p>\n

WITH t1 AS (
\n SELECT
\n reason,
\n COUNT(*) AS num_people,
\n DENSE_RANK() OVER (ORDER BY COUNT(*) DESC) AS rk
\n FROM new_hires
\n GROUP BY reason
\n)
\nSELECT
\n reason,
\n num_people
\nFROM t1
\nWHERE rk = 4; <\/p>\n

\u6216\u8005\u5229\u7528order by desc limit offset\u5373\u53ef<\/p>\n

SELECT
\n reason,
\n COUNT(*) AS num_people
\nFROM new_hires
\nGROUP BY reason
\nORDER BY num_people DESC — \u964d\u5e8f\u6392\u5217，\u4eba\u6570\u6700\u591a\u7684\u5728\u524d
\nLIMIT 1 OFFSET 3; — \u8df3\u8fc7\u524d3\u540d，\u53d6\u7b2c4\u540d <\/p><\/p>\n","protected":false},"excerpt":{"rendered":"

\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb444\u6b21\u3002\u9898\u76ee\u4e00\uff1a\u601d\u8def\uff1a\u6392\u540d\u5f53\u7136dense_rank\u6392\u5e8f\u4e86\uff0c\u7136\u540e\u5176\u4f59\u76f4\u63a5\u67e5\u8be2\u5c31\u597d\u3002\u6216\u8005\u5229\u7528order by desc limit offset\u5373\u53ef\u3002\u67e5\u8be2\u65b0\u8fdb\u7c7b\u578b\u4e2d\uff0c\u4e0d\u540c\u539f\u56e0\u7684\u5408\u8ba1\u4eba\u6570\u4ee5\u53ca\u4eba\u6570\u6392\u540d\u3002\u6392\u540d\u7b2c 4 \u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f\u9898\u76ee\u4e8c\uff1a\u641c\u7d22\u5bf9\u5e94rank =4\u7684\u5373\u53ef\u3002\u7ed3\u679c\u8f93\u51fa\u539f\u56e0\u3001\u4eba\u6570\u3001\u6392\u540d\u3002\u586b\u5199\u793a\u4f8b\uff1a\u793e\u4f1a\u62db\u8058 20\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[768,3617,100],"topic":[],"class_list":{"0":"post-39846","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-server","7":"tag-sql","9":"tag-100"},"yoast_head":"\nSQL\u6bcf\u65e5\u4e00\u9898\uff085\uff09 - 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