可能重复:
WHERE clause better execute before IN and JOIN or after
INNER JOIN versus WHERE clause — any difference?交叉联接差异问题
什么,如果有的话,有以下区别?
Select
col1,
col2
from TableA A, TableB B
where A.ID = B.ID
和
Select
col1,
col2
From TableA A
Inner Join TableB B on A.ID = B.ID
他们似乎在SQL同样的行为,
请注意,这不是'CROSS JOIN'。这两个查询都是'INNER JOIN'。 – 2011-05-03 22:23:33