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select jhdb.jhdh from jhdb A //出错
Server: Msg 107, Level 16, State 3, Line 1
The column prefix 'jhdb' does not match with a table name or alias name used in the query.
select * from jhdb A //不会出错
Server: Msg 107, Level 16, State 3, Line 1
The column prefix 'jhdb' does not match with a table name or alias name used in the query.
select * from jhdb A //不会出错