這是SQL 89中內鏈接的寫法抄。
內鏈接:
SQL89:Select * From a,b where a.id=b.id
SQL92:select * from a inner join b on a.id=b.id
交叉連接
SQL89:Select * From a,b
SQL92:select * from a cross join b
外連接在sql 92標准中引百入的，只有一種寫法（以左外連接為例）度
select * from a left join b on a.id=b.id
select from a，b where a.id b.id 是什么連接
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