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SQL Query optimise and clean up

Posted on 2011-03-08
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Last Modified: 2012-05-11
Hello

Could someone help me clean up this query, it's a bit of a mess and I'm sure it could be optimised. It does work though.

Thanks!

DECLARE @PostCode nvarchar(4);
DECLARE @PostCode2 nvarchar(4);
SET @PostCode = 'EH1';
SET @PostCode2 = 'EH12';

/*  P = 3 and P2 = 3 */

IF LEN(@PostCode) = 3 AND LEN(@PostCode2) = 3

BEGIN
SELECT DISTINCT Emails.email
FROM            Emails LEFT JOIN
                         Customers ON Customers.EmailAddress = Emails.email
WHERE        LEN(REPLACE(REPLACE(Customers.PostCode, ' ', ''), '-', '')) = 6 AND 
				SUBSTRING(REPLACE(Customers.PostCode, ' ', ''), 1, 2) = SUBSTRING(@PostCode, 1, 2)
				AND SUBSTRING(REPLACE(Customers.PostCode, ' ', ''), 3, 1) BETWEEN 
				SUBSTRING(@PostCode, 3,1) AND SUBSTRING(@PostCode2, 3,1)
END ELSE 

/* IF P = 4 and P2 = 4 */

IF LEN(@PostCode) = 4 AND LEN(@PostCode2) = 4
BEGIN
SELECT DISTINCT Emails.email
FROM            Emails LEFT JOIN
                         Customers ON Customers.EmailAddress = Emails.email
WHERE        LEN(REPLACE(REPLACE(Customers.PostCode, ' ', ''), '-', '')) = 7 AND 
				SUBSTRING(REPLACE(Customers.PostCode, ' ', ''), 1, 2) = SUBSTRING(@PostCode, 1, 2)
				AND SUBSTRING(REPLACE(Customers.PostCode, ' ', ''), 3, 2) BETWEEN 
				SUBSTRING(@PostCode, 3,2) AND SUBSTRING(@PostCode2, 3,2)				
END ELSE

/* P = 3 AND P2 = 4 */

IF LEN(@PostCode) = 3 AND LEN(@PostCode2) = 4
BEGIN
SELECT DISTINCT Emails.email
FROM            Emails LEFT JOIN
                         Customers ON Customers.EmailAddress = Emails.email
WHERE        (LEN(REPLACE(REPLACE(Customers.PostCode, ' ', ''), '-', '')) = 6 AND 
				SUBSTRING(REPLACE(Customers.PostCode, ' ', ''), 1, 2) = SUBSTRING(@PostCode, 1, 2)
				AND SUBSTRING(REPLACE(Customers.PostCode, ' ', ''), 3, 1) BETWEEN 
				SUBSTRING(@PostCode, 3,1) AND 9)
				OR
				(LEN(REPLACE(REPLACE(Customers.PostCode, ' ', ''), '-', '')) = 7 AND 
				SUBSTRING(REPLACE(Customers.PostCode, ' ', ''), 1, 2) = SUBSTRING(@PostCode, 1, 2)
				AND SUBSTRING(REPLACE(Customers.PostCode, ' ', ''), 3, 2) BETWEEN 
				10 AND SUBSTRING(@PostCode2, 3,2))		
END

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Question by:badpilot
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2 Comments
 
LVL 41

Accepted Solution

by:
Sharath earned 2000 total points
ID: 35071306
You can try like this.
DECLARE @PostCode nvarchar(4);
DECLARE @PostCode2 nvarchar(4);
SET @PostCode = 'EH1';
SET @PostCode2 = 'EH12';

SELECT DISTINCT Emails.email 
  FROM Emails 
       LEFT JOIN Customers 
         ON Customers.EmailAddress = Emails.email 
 WHERE ((LEN(@PostCode) = 3 
         AND LEN(@PostCode2) = 3) 
        AND (LEN(REPLACE(REPLACE(Customers.PostCode,' ',''),'-','')) = 6 
             AND SUBSTRING(REPLACE(Customers.PostCode,' ',''),1,2) = SUBSTRING(@PostCode,1,2)
             AND SUBSTRING(REPLACE(Customers.PostCode,' ',''),3,1) BETWEEN SUBSTRING(@PostCode,3,1) AND SUBSTRING(@PostCode2,3,1)))
        OR ((LEN(@PostCode) = 4 
             AND LEN(@PostCode2) = 4) 
            AND (LEN(REPLACE(REPLACE(Customers.PostCode,' ',''),'-','')) = 7 
                 AND SUBSTRING(REPLACE(Customers.PostCode,' ',''),1,2) = SUBSTRING(@PostCode,1,2)
                 AND SUBSTRING(REPLACE(Customers.PostCode,' ',''),3,2) BETWEEN SUBSTRING(@PostCode,3,2) AND SUBSTRING(@PostCode2,3,2)))
        OR ((LEN(@PostCode) = 3 
             AND LEN(@PostCode2) = 4) 
            AND ((LEN(REPLACE(REPLACE(Customers.PostCode,' ',''),'-','')) = 6 
                  AND SUBSTRING(REPLACE(Customers.PostCode,' ',''),1,2) = SUBSTRING(@PostCode,1,2)
                  AND SUBSTRING(REPLACE(Customers.PostCode,' ',''),3,1) BETWEEN SUBSTRING(@PostCode,3,1) AND 9)
                  OR (LEN(REPLACE(REPLACE(Customers.PostCode,' ',''),'-','')) = 7 
                      AND SUBSTRING(REPLACE(Customers.PostCode,' ',''),1,2) = SUBSTRING(@PostCode,1,2)
                      AND SUBSTRING(REPLACE(Customers.PostCode,' ',''),3,2) BETWEEN 10 AND SUBSTRING(@PostCode2,3,2))))

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Author Closing Comment

by:badpilot
ID: 35071425
Beautifull!!! Thanks!
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