在 SQL 中，使用主键连接两个表后，如何仅返回表之间另一列中的值不同的行

Question

I have code reading

SELECT * FROM table1 A JOIN table2 B ON A.id = B.id WHERE_____?

The "id"s in table 1 and 2 are the same but some of the other values in different columns may differ. How do I search every column and return only the rows where there is a difference between table 1 and 2. For values that differ will it return the row from table 1? Thank you.

Answer 1

You would use:

where a.col1 <> b.col1 or a.col2 <> b.col2 or . . .

or, if you need to take NULL s into account:

where not (a.col1 <=> b.col1 and a.col2 <=> b.col2 and . . . )