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Results tagged with sql-server
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user 10826
All versions of Microsoft SQL Server (not MySQL). Please also add a version-specific tag, like sql-server-2016, since it is often relevant to the question.
8
votes
2
answers
240
views
Non-Clustered Indexes - keys and nonkeys
I just want to make sure I'm on the right track with these concepts, so any feedback would be greatly appreciated.
Here's my theory from the query I've just optimised, through a process of trial and …
- 263
7
votes
4
answers
6k
views
Speeding up COUNT(*) - WHERE clause slowing query
The following query takes 497 ms to run, if I remove the AND portion onwards it only takes 320 ms. Is there any way to speed this up? The only indexes I have on 'messages' table is a PK on 'messages_i …
- 263
1
vote
3
answers
10k
views
INNER JOIN making COUNT(*) slow
I have a very simple query:
SELECT COUNT(*)
FROM messages
INNER JOIN users ON messages.user_id = users.user_id
With the join it takes 1146 ms and without it takes 220 ms (220 ms still seems slow to …
- 263