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摘要: SQL在线练习 https://h.w.com/lin/h select SUBSTRING_INDEX("https://h.w.com/lin/h", '/', 3) 效果: https://h.w.com huangwanlin SELECT left("huangwanlin" ,5) 效果 阅读全文
posted @ 2017-04-26 16:25 huangwanlin 阅读(160) 评论(0) 推荐(0) 编辑
摘要: 查询排行及所有(表名.*) 1. set @rownum=0; SELECT @rownum:=@rownum+1 AS top, customer.* FROM customer 2. SELECT @rownum:=@rownum+1 AS top, customer.* FROM (SELEC 阅读全文
posted @ 2017-04-26 11:27 huangwanlin 阅读(196) 评论(0) 推荐(0) 编辑
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