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Filter duplicate students via T-SQL


Filter duplicate students via T-SQL

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kevin_nikolai
kevin_nikolai
Old Hand
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Points: 381 Visits: 523
/*

I need to filter for duplicate students:
---------------------------------------
For same student, if one or both instance/s of IDNo is null then do the following:

1.
if both instances of Tel3 are identical for same Student (Alison), if they are
use it to populate field Sort with the value.

2.
if both instances of Tel3 are not identical for same Student (Carmen), check if both instances of Tel2 are identical for same Student, if they are use it to populate field Sort with the value.

3.
if both instances of Tel3 and Tel2 are not identical for same Student (Amber), check if an instance of Tel3 & Tel2 are identical for same Student, if they are use it to populate field Sort with the value.

*/

SELECT 'Alison' as Student, NULL as IDNo, '1111' as Tel3, '1111' as Tel1, NULL as Sort UNION ALL
SELECT 'Alison' as Student, '80405088' as IDNo, '1111' as Tel3, '1111' as Tel1, NULL as Sort UNION ALL

SELECT 'Amber' as Student, NULL as IDNo, '5555' as Tel3, '6666' as Tel1, NULL as Sort UNION ALL
SELECT 'Amber' as Student, NULL as IDNo, '7777' as Tel3, '7777' as Tel1, NULL as Sort UNION ALL

SELECT 'Carmen' as Student, NULL as IDNo, '8888' as Tel3, '8888' as Tel1, NULL as Sort UNION ALL
SELECT 'Carmen' as Student, '20083085' as IDNo, '9999' as Tel3, '8888' as Tel1, NULL as Sort
Sean Lange
Sean Lange
One Orange Chip
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duplicate post. direct replies here. http://www.sqlservercentral.com/Forums/Topic1444358-392-1.aspx

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