CODEWITHSUNDEEP
sqlteradatateradata-sql-assistantteradatasql
User771
User771

Reputation: 53

Improving a SQL teradata query

I have a table like below and I want 'Y' in front of Ref 345 and 789 in the result-set on basis of count(Ref) = 1 where the amount is less than 0. I am using this query to get the desired output. My question is, is there any other (and more efficient) way to do it in Teradata?

enter image description here

SELECT T.Ref,T.AMOUNT, R.Refund_IND as Refund_IND    
FROM Table1 t    
LEFT JOIN (select 'Y' as Refund_IND, Ref from Table1 where Ref in    
(select Ref from Table1 where amount < 0)     
group by Ref having count(Ref) = 1) R on t.Ref = R.Ref

Upvotes: 0

Views: 105

Answers (1)

JNevill
JNevill

Reputation: 50034

You can use window functions to test these conditions:

 SELECT
     Ref,
     Amount,
     CASE WHEN COUNT(*) OVER (PARTITION BY REF) = 1 AND Amount < 0 THEN 'Y' ELSE '' END AS Refund_Ind 
  FROM Table1

Upvotes: 3

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