How to select two columns with a single WHERE clause?

Question

How can I select more than one table in sql server while using a single where clause condition for both tables? For example, if I had two tables named table1 , table2 , then:

select * from table1,table2 where rollno=1

But in the above query it gives me error -

ambiguous column

which is logical.

Answer 1

提供Alias name或使用tablename以避免ambiguous column error并尝试。

select * from table1 A,table2 B where A.rollno=1 AND B.rollno=1