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Substituting NULL values in a SELECT query


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vickyprodigy

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Joined: 18 Jul 2007
Posts: 11
Location: Chennai

PostPosted: Wed Sep 26, 2007 2:38 pm
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Hi,

I generate reports from Error log tables. Wat i do is... i run a SELECT query based on certain conditions and i FTP the result in a TXT format. When i FTP it, the records which has NULL in the table is getting overwritten by the values of the subsequent column. To prevent this, i need a way to substitute someother value (eg '-' ) for the NULL values. Is it possible to do it in the SELECT query itself????
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dbzTHEdinosauer

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Joined: 20 Oct 2006
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PostPosted: Wed Sep 26, 2007 3:03 pm
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COALESCE
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vickyprodigy

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PostPosted: Wed Sep 26, 2007 3:23 pm
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Can you explain please
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vickyprodigy

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PostPosted: Wed Sep 26, 2007 3:26 pm
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thanks got it...

also...

can somebody tell ... how do i make the result of a varchar column of same length in a SELECT query...


Thanks
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Ajay Baghel

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Joined: 25 Apr 2007
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PostPosted: Wed Sep 26, 2007 3:31 pm
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Or use 'SELECT VALUE(COLX,value)'

Whenever COLX column has null, it is substituted by value.
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mbr_raja

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Joined: 15 Nov 2004
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PostPosted: Wed Sep 26, 2007 3:39 pm
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Hi,

You can use this function as given below. By using the IFNULL function, you can able to findout null values and replace with given specific strings. It can also be used to specify multiple columns within a single select query.

SELECT EMPNO, IFNULL(SALARY, '-') FROM ADMINISTRATOR.EMP;
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