Mysql 常用SQL語句集錦

查詢時間，友好提示

乙個sql 返回多個總數

$sql = "select count(*) all, " ;

$sql .= " count(case when status = 1 then status end) status_1_num, ";

$sql .= " count(case when status = 2 then status end) status_2_num ";

$sql .= " from table_name";

update join / delete join

$sql = "update table_name_1 ";

$sql .= " inner join table_name_2 on table_name_1.id = table_name_2.uid ";

$sql .= " inner join table_name_3 on table_name_3.id = table_name_1.tid ";

$sql .= " set *** = *** ";

$sql .= " where *** ";

//delete join 同上。

替換某字段的內容的語句

$sql = "update table_name set content = replace(content, 'aaa', 'bbb') ";

$sql .= " where (content like '%aaa%')";

獲取表中某欄位包含某字串的資料

$sql = "select * from `表名` where locate('關鍵字', 欄位名) ";

查詢表中多餘的重覆記錄

刪除表中多餘的重覆記錄(留id最小)

thanks ~ 

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