Question

Using SQL Server 2000

Master Table

ID Date Value

001 23-04-2009 200
001 24-04-2009 300
002 23-04-2009 250
002 24-04-2009 350
002 25-04-2009 250
....

Secondary Table

ID Date Value

    001 23-04-2009 200
    001 24-04-2009 300
    002 23-04-2009 250
    002 24-04-2009 350
    002 25-04-2009 250
    002 26-04-2009 550
    ....

In the master table i want to insert a data’s from the secondary table (Each data’s should insert from next date onwards for each id)

If i am inserting secondary table data’s in to master table, master table should accept id from next date onwards…

Expected output

ID Date Value

001 23-04-2009 200 'old record from master table
001 24-04-2009 300 'old record from master table
002 23-04-2009 250 'old record from master table
002 24-04-2009 350 'old record from master table
002 25-04-2009 250 'old record from master table
002 26-04-2009 550 'New Record from Secondary Table

Below mentioned record is not inserted in the master table, because date is available for the id’s in the master table

    001 23-04-2009 200
    001 24-04-2009 300
    002 23-04-2009 250
    002 24-04-2009 350
    002 25-04-2009 250

How to make a query for insert a record with validation(id and date).

Need SQL Query Help

Answer 1

select s.*
from 
(select id, date, value
from secondaryTable ) s ,

(
select id, max(date) as date 
from mainTable
group by id ) a

where s.id = a.id and s.date>a.date

this query should return the desired rows that are supposed to be inserted in main table, I have not tested the query, pardon any bugs