On Wed, Feb 23, 2005 at 12:02:32PM -0000, Warren, Matthew (Retail) wrote:
> Ok, I can do that. But, surely NULL != 'VAULT' is not like '%VAULT%' ?
SQL has three valued logic: TRUE, FALSE and UNKNOWN (or NULL):
tsm: SERVER1>select count(*) from volumes
108
tsm: SERVER1>select count(*) from volumes where pct_reclaim = 0.0
36
tsm: SERVER1>select count(*) from volumes where pct_reclaim != 0.0
53
tsm: SERVER1>select count(*) from volumes where pct_reclaim is null
19
tsm: SERVER1>select count(*) from volumes where pct_reclaim is not null
90
--
Jurjen Oskam
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