Question

I am not sure how to describe my question (maybe title is not proper).

Here it is:

I have a table like this:

item   type stockdate    saledate

1      1    2012-11-06   2012-11-05

2      2    2012-11-06   2012-11-07

3      2    2012-11-06   2012-11-05

So, I want to select from the above table.

There are two conditions:

1. if the type of an item is 1, then I anyway show this item
2. If the type of an item is 2, but its saledate >= stockdate, then I show; otherwise, I don’t show

So from the above table, I want to show only item 1 and 2, because item 1 has type of 1, item 2 has type of 2 but its saledate >= stockdate, item 3 cannot be shown because its saledate<stockdate.

How can I write the select query?

I am using MS SQL Server.

Answer 1

The simpliest solution would be,

SELECT  *
FROM    tableName
WHERE   (type = 1) OR
        (
            type = 2 AND
            saledate >= stockdate
        )

• SQL Fiddle Demo