1,
sql="select * from [biao] where (id is null)"
适合Access数据库吗?适合sql server数据库吗?
2
sql="select * from [biao] where isnull(id)"
适合Access数据库吗?适合sql server数据库吗?
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where (id is null)什么意思?
1, sql="select * from [biao] where (id is null)" 适合Access数据库吗?适合sql server数据库吗? 2 sql="select * from [biao] where isnull(id)" 适合Access数据库吗?适合sql server数据库吗?