Query to find if a parent has multiple items in SQL server

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SQL-Server-2008R2

I have the following table. How can I find if a Parent has multiple items.

For Eg: Parent 1 has items ABC and BBC, So the query should display '(Multiple)' instead of showing Item names. Parent 5 has only single item, It should show the Item name.

Price      |    Item    |  Parent
-----------|------------|-------------
20         |   ABC      |   1
10         |   BBC      |   1
5          |   CBC      |   5
21         |   DDB      |   6
17         |   BDD      |   6
31         |   DBB      |   6

What I have tried:

I have created the following query which doesn't seems to be working.

SQL

SELECT CASE WHEN COUNT(*) > 1 THEN '(Multiple)' ELSE Item END FROM 
(SELECT COUNT(*), Item FROM Table WHERE Parent = @parent 
GROUP BY Item) Table GROUP BY Item

Posted 6-Jul-18 23:24pm

Yesudass Moses

Updated 7-Jul-18 0:07am

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#realJSOP · Answer 1 · 2018-07-07T00:07:00

I think this will do it:

SQL

SELECT   parent, 
         count(*) AS [Count] 
FROM     dbo.[mytable] 
GROUP BY parent 
HAVING   COUNT(Parent) > 1

UPDATE ================================

SQL

;WITH cte AS
(
SELECT   parent, 
         SUM(1) AS quantity
FROM     dbo.[parents] 
GROUP BY parent 
)
SELECT a.parent,
       MAX(CASE WHEN b.quantity=1 THEN a.item ELSE 'Multiple' END) AS Item
FROM   dbo.[parents] AS a
FULL JOIN cte AS b ON b.parent = a.parent
GROUP BY a.parent
ORDER BY a.parent