这是SQL 89中内链接的写法抄。
内链接:
SQL89:Select * From a,b where a.id=b.id
SQL92:select * from a inner join b on a.id=b.id
交叉连接
SQL89:Select * From a,b
SQL92:select * from a cross join b
外连接在sql 92标准中引百入的，只有一种写法（以左外连接为例）度
select * from a left join b on a.id=b.id
select from a，b where a.id b.id 是什么连接
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