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Tsql to Select Rows Based on a Condition

I have two tables.

I need to select rows in one table based on the number of times a common field occurs in the other table.

Table 1: Exceptions, Common field: SymbolID
Table 2: StockHist, Common field: SymbolID

SELECT SymbolID FROM Exceptions
WHERE Count(Exceptions.SymbolID) in StockHist is less than or equal to 5

Thanks,
0
Dovberman
Asked:
Dovberman
5 Solutions
 
Daniel Van Der WerkenIndependent ConsultantCommented:
Something like this:

SELECT EX.SymbolID
FROM Exceptions EX
INNER JOIN StockHist SH
   ON SH.SymbolID = EX.SymbolID
GROUP BY EX.SymbolID
HAVING COUNT(EX.SymbolID) <= 5

Open in new window

0
 
Brian CroweDatabase AdministratorCommented:
You can alter the procedure below to use a correlated subquery instead of a common table expression but I prefer the latter for readability.

WITH cteStockHist (SymbolID, [Count])
AS
(
   SELECT SymbolID, COUNT(1) AS [Count]
   FROM StockHist
   GROUP BY SymbolID
   HAVING COUNT(1) >= 5
)
SELECT E.*
FROM Exceptions AS E
INNER JOIN cteStockHist AS cte
   ON E.SymbolID = cte.SymbolID
0
 
DovbermanAuthor Commented:
I will try both and give you feedback.

Thanks,
0
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Scott PletcherSenior DBACommented:
SELECT e.*
FROM Exceptions e
INNER JOIN (
    SELECT SymbolID, COUNT(*) AS Symbol_Count
    FROM StockHist
    --WHERE ...
    GROUP BY SymbolID
    HAVING COUNT(*) <= 5
) AS S ON
    s.SymbolID = e.SymbolID
--WHERE ...
0
 
ZberteocCommented:
The simplest query is:

SELECT 
	SymbolID 
FROM 
	Exceptions E
WHERE 
	(SELECT Count(*) FROM StockHist WHERE SymbolID=E.SymbolID)<=5

Open in new window

0
 
DovbermanAuthor Commented:
All three work.

Can the following be used to delete Exception table rows where the Exception.SymbolID occurs less than 5 times in the StockHist table? I do not want to delete StockHist rows.

DELETE FROM Exceptions EX
INNER JOIN StockHist SH
   ON SH.SymbolID = EX.SymbolID
GROUP BY EX.SymbolID
HAVING COUNT(EX.SymbolID) <= 5
0
 
ZberteocCommented:
Use this:

DELETE E FROM Exceptions E
WHERE 
	(SELECT Count(*) FROM StockHist WHERE SymbolID=E.SymbolID)<=5

Open in new window

0
 
DovbermanAuthor Commented:
I wish to thank all of you.
0
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