如何乘以和添加列？

Question

I basically want to do this function as a new column.

New Column = a1*a2 + b1*b2 + c1*c2

where a1,a2,b1,b2,c1,c2 are all existing columns with numerical values in each cell. Any help would be appreciated

Answer 1

Please check columns a1,a2,b1,b2,c1,c2 has "type" is bigint;

And use QSL:

ALTER TABLE demo.abc ADD COLUMN d bigint;

Update demo.abc set d = abc.a1 * abc.a2 + abc.b1 * abc.b2 + abc.b1*abc.c2;