Question

I want to implement something like Col3 = Col2 + Col1 in SQL.

This is somewhat similar to Excel, where every value in column 3 is sum of corresponding values from column 2 and column 1.

Answer 1

Yes, you can do it in SQL using the UPDATE command:

UPDATE TABLE table_name
SET col3=col1+col2
WHERE <SOME CONDITION>

This assumes that you already have a table with populated col1 and col2 and you want to populate col3.