Question

I have a query like this:

select a,b,c
from
table

Now I have another table which has hoursWorked in it. Basically I want the sum of anotherTable.hoursWorked where anotherTable.a = a and anotherTable.b = b and anotherTable.c = c.

What kind of query do I need to do this?

Thanks

Something like this:

SELECT DATE, CUSTOMER, SUM(FKEY.HOURSWORKED)
FROM TABLE1
INNER JOIN TABLE2 FKEY ON FKEY.CUSTOMER = CUSTOMER, FKEY.DATE = DATE

Answer 1

You would write something like this:

SELECT SUM(at.hoursWorked)
FROM
    anotherTable at
    JOIN (SELECT a, b, c FROM thisTable) t
    ON at.a = t.a AND at.b = t.b AND at.c = t.c