Question

Can anyone please help – See below two tables

Table - Master
Field 1 - Id
Field 2 - Name
Field 3 - Address
Field 4 - Effective End Date
Filed 5 - Last updated date

Table - Child
Field 1 - Id
Field 2 - Name
Field 3 - Address

I need to do lookup from Parent in child and if Parent record doesn’t exist (based on Id, Name and Address) then update the effective end date and last updated date of Table Master.

New to SQL, so struggling with this basic query.

Regards

Answer 1

Try it like this:

UPDATE  m
SET     [Effective End Date] = GETDATE()
        , [Last updated date] = GETDATE()
FROM    Master m
WHERE   NOT EXISTS
(
    SELECT  *
    FROM    Child c 
    WHERE   c.Id = m.Id
    AND     c.Name = m.Name
    AND     c.Address = m.Address
)

If you want to update records in Master when a record with same Id, Name, Address does not exist in Child table you can do it like this. There’s also an OUTPUT clause that returns rows affected by the update. The dates are being updated to today’s date but you can set that to anything you need.

Here is an SQL Fiddle