Question

Using SQL Server 2000

I want to compare the table2.date between table1.from, table1.todate, if exist then value should be 0 (zero)

Table1

ID FromDate ToDate

001 20090801 20090815
002 20090817 20090820
…,

Table2

Id Date Value

001 20090730 100
001 20090731 200
001 20090801 300
001 20090802 400
…
001 20090815 0
001 20090816 250
…

From the above two table I want to ID, Date, value from table2 where table2.date between table1.fromdate and table1.todate then table2.value =0

Expected Output

Id Date Value

001 20090730 100
001 20090731 200
001 20090801 0
001 20090802 0
…

001 20090815 0
001 20090816 250

How to make a query for this condition?

Answer 1

This will show value for the records present, 0 for the records missing:

SELECT  t2.id, t2.date,
        COALESCE(
        (
        SELECT  TOP 1 t2.value
        FROM    table1 t1
        WHERE   t2.date BETWEEN t1.fromdate AND t1.todate
                AND t2.id = t1.id
        ), 0) AS value
FROM    table2 t2

This will work other way around: 0 for the records present, value for the records missing:

SELECT  t2.id, t2.date,
        COALESCE(
        (
        SELECT  TOP 1 0
        FROM    table1 t1
        WHERE   t2.date BETWEEN t1.fromdate AND t1.todate
                AND t2.id = t1.id
        ), t2.value) AS value
FROM    table2 t2