有時我們不僅需要用乙個欄位去關聯，還希望兩個表的兩個欄位都是一樣的，這時候可以這樣寫
select * from(
select id,name,code from table1
) aleft join
(select id,name,code from table2
) bon a.id = b.id and a.code = b.code
有時候on出錯的話，可以用cast
on cast(a.id as varchar(40)) = cast(b.id as varchar(40))
and cast(a.code as varchar(40)) = cast(b.code as varchar(40))
inner join right join 亦然~
你學廢了嗎
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