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In SQL Server 2005, What is difference between
((SELECT ISNULL(columnName,CONVERT(DATETIME,'January 01,1900',101))) = CONVERT(DATETIME,'January 01,1900',101)) and columnName = null

Can I replace
[((SELECT ISNULL(columnName,CONVERT(DATETIME,'January 01,1900',101))) = CONVERT(DATETIME,'January 01,1900',101))] with [columnName = null]?
Posted 10-Apr-13 21:04pm
Edited 10-Apr-13 21:12pm
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Solution 1

You can run the components of the first query in sql server management studio.
This will give you a fair idea of what the final query is doing.
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Solution 2


The ISNULL function replaces NULL with the specified replacement value. Your query just double checks the nullness of a column. You can safely remove this condition. Instead use columnName IS NULL.


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