只需合併2刪除查詢，使其成爲一個

Question

我有2刪除SQL查詢我想要一個。

$sql1= DELETE FROM user WHERE userid={$id} 

另一個是

$sql = Delete FROM user_meta where userid = {$id} 

有什麼建議？我想簡化它。

Answer 1

刪除來自不同表的事「的同時」的方式，一般是包他們在交易中。喜歡的東西：

begin transaction thedeletes 
    DELETE FROM user WHERE userid={$id}; 
    DELETE FROM user_meta WHERE userid = {$id} 
commit transaction thedeletes; 

在MySQL實際上你可以把這些在同一個查詢：

delete u, um 
    from user u join 
     user_meta um 
     on u.userid={$id} and um.userid = {$id}; 

Answer 2

你不能在DELETE語句2個表中刪除，但你在發出去1 2點聲明：

$sql = "DELETE FROM user WHERE userid={$id}; 
DELETE FROM user_meta WHERE meta_key = {$id};"