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How to group and count

Author

Topic

Sun Foster
Aged Yak Warrior

515 Posts

Posted - 2006-07-23 : 07:52:04

In a Order table, there are records like bellow:
OrderID: 111,222,333 222, 222, 333
How to code to count(OrderID) = 3 not = 6 ?

I used code bellow but did not work:

select count(OrderID) from Order group by OrderID

Kristen
Test

22859 Posts

Posted - 2006-07-23 : 08:11:55

This maybe?

select count(DISTINCT OrderID) from Order

Kristen

2400hrs
Starting Member

4 Posts

Posted - 2006-07-23 : 08:15:52

[code]
SELECT COUNT(DISTINCT OrderID) FROM [Order]
[/code]

Your SQL is counting the OrderIDs per grouping, so you will get something like:

1
2
3

If written

[code]
SELECT OrderID, COUNT(OrderID) OrderCount
FROM [Order]
GROUP BY OrderID
[/code]

You would see what it's doing:

[code]
Order ID OrderCount
111 1
222 3
333 2
[/code]

Sun Foster
Aged Yak Warrior

515 Posts

Posted - 2006-07-23 : 09:22:16

It works, thank both of you!!!

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