Question

I am having 2 tables.

Table 1:-

id     name

1       k
2       a

Table 2:-

id    sub1    sub2

1      10      20
2      30      40

I want the output as k -> 30 and a -> 70.

I fired the following query….

SELECT tbl_1.`name` , SUM(tbl_2.sub1 + tbl_2.sub2) as total 
from tbl_1, tbl_2 WHERE tbl_1.id = tbl_2.id;

OUTPUT :-

k -> 100

but i want like

k->30
a->70

if anyone has any idea please kindly help….

Answer 1

Remove the SUM(), and just use tbl_2.sub1 + tbl_2.sub2.

SUM() sums ‘vertically’, by summing the values of all the rows.

+ sums ‘horizontally’ in this case, by summing the values of the columns.

The way you were doing it summed both horizontally and vertically.