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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                一個查詢語句的完整形式如下所示: ``` select 子句 [from 子句] [where 子句] [group by子句] [having子句] [order by子句] [limit 子句] ; ``` 可見,select語句還是比較復雜的——其實是mysql中最復雜的語句。 總體說明: 1,以上中括號中的任一項都可以省略,但如果不省略,就應該按該順序出現。 2,通常,from后的子句都需要有from子句, having子句需要有group by子句。 3,這些子句的“執行順序”,也是按此順序進行的。 ![](https://img.kancloud.cn/4e/41/4e4173a27ce9343aae26484f684654bb_633x561.jpg)
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