Difference betwen ((SELECT ISNULL(columnName,CONVERT(DATETIME,'January 01,1900',101))) = CONVERT(DATETIME,'January 01,1900',101)) and columnName = null

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SQL-server-2000

SQL-Server-2005

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In SQL Server 2005, What is difference between

SQL

((SELECT ISNULL(columnName,CONVERT(DATETIME,'January 01,1900',101))) = CONVERT(DATETIME,'January 01,1900',101)) and columnName = null

Can I replace

SQL

[((SELECT ISNULL(columnName,CONVERT(DATETIME,'January 01,1900',101))) = CONVERT(DATETIME,'January 01,1900',101))] with [columnName = null]?

Posted 10-Apr-13 20:04pm

PSAFOL

Updated 10-Apr-13 20:12pm

Shanalal Kasim

v3

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Abhinav S · Answer 1 · 2013-04-10T20:10:00

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.

Posted 10-Apr-13 20:10pm

Abhinav S

Prasad Khandekar · Answer 2 · 2013-04-10T20:17:00

Solution 2

Hello,

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.

Regards,

Posted 10-Apr-13 20:17pm

Prasad Khandekar