select a.*,ifnull(b.a1 is null,0,1) from a left join b on a.a1=b.a1
[SQL] select a.*,ifnull(b.a1 is null,0,1) from a left join b on a.a1=b.a1[Err] 1582 - Incorrect parameter count in the call to native function 'ifnull'版主麻烦再帮忙看下呢............................
select a.*,if(b.a1 is null,0,1) from a left join b on a.a1=b.a1
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