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Archives of the TeradataForum
Message Posted: Wed, 22 Oct 2003 @ 20:14:16 GMT
| Subj: | | Re: Question on 'sample' |
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| From: | | Dieter Noeth |
TeradataForum wrote:
| | When I do a 'sample' in a query, does this save on spool space or does the server build the entire set in the spool and then return
the specified 'sample' ? | |
| | select * from table
sample 100 | |
Just run explain, it will tell you when the sample is created: If there's no WHERE-condition and no JOIN it's building only a spool
of the sampled data, else it's spooling first and then doing the sample.
Dieter
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