Question

How can I connect two tables on columns with certain linked values but not having the same values?

For instance I need to join tbl1 to tbl2 where tbl1.col=100 and tbl2.col=200. The only connection that have is to me/my company.

Is there a way to link the rows without an explicit shared value? I need all rows with col value ‘100’ to be on the same row as all tbl2 columns have col value 200.

Answer 1

Is there a way to link the rows without an explicit shared value?

Yes. You can write a custom JOIN to relate data yourself.

You didn’t specify your specific DBMS, so the following examples contain generic SQL.

SELECT * FROM tbl1, tbl2 WHERE tbl1.col = 100 AND tbl12.col = 200

Or, more dynamically:

SELECT * FROM tbl1, tbl2 WHERE tbl1.col + 100 = tbl12.col;
-- with JOIN
SELECT * FROM tbl1 JOIN tbl2 ON (tbl1.col + 100) = tbl12.col;