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Out of order


Out of order

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Dave62
Dave62
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Comments posted to this topic are about the item Out of order
bitbucket-25253
bitbucket-25253
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Nice question

If everything seems to be going well, you have obviously overlooked something.

Ron

Please help us, help you -before posting a question please read

Before posting a performance problem please read
Carlo Romagnano
Carlo Romagnano
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CREATE VIEW vw_clients AS
SELECT TOP 100 PERCENT Code, Name FROM Clients
ORDER BY Code


I am curious to know if the VIEW above always returns records in sorted order.
paul.knibbs
paul.knibbs
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Carlo Romagnano (10/21/2011)
CREATE VIEW vw_clients AS
SELECT TOP 100 PERCENT Code, Name FROM Clients
ORDER BY Code


I am curious to know if the VIEW above always returns records in sorted order.


No, it doesn't, unless you're still running SQL 2000. On more recent SQL versions the optimiser will see that the TOP 100 PERCENT and the ORDER BY are both redundant and will remove them. If you want the results of a view to be sorted, you have to include the ORDER BY in the SELECT statement you use to query the view.
paul s-306273
paul s-306273
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Sneaky question.
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
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Good question...
even then, the sort order of any select from the view is not guaranteed....

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Carlo Romagnano
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paul.knibbs (10/21/2011)
Carlo Romagnano (10/21/2011)
CREATE VIEW vw_clients AS
SELECT TOP 100 PERCENT Code, Name FROM Clients
ORDER BY Code


I am curious to know if the VIEW above always returns records in sorted order.


No, it doesn't, unless you're still running SQL 2000. On more recent SQL versions the optimiser will see that the TOP 100 PERCENT and the ORDER BY are both redundant and will remove them. If you want the results of a view to be sorted, you have to include the ORDER BY in the SELECT statement you use to query the view.

Thanks. In fact, in sql2000 the optimizer use an index scan (create index idx_client_code on Clients(Code)).
Richard Warr
Richard Warr
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Well, I'm glad I looked at these posts. I knew you could order a view if you did the SELECT TOP (100) PERCENT thing but I hadn't realised that it didn't work!
So what looked like an easy question has become an opportunity to learn something new.

_____________________________________________________________________
MCSA SQL Server 2012
Carlo Romagnano
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Stewart "Arturius" Campbell (10/21/2011)
Good question...
even then, the sort order of any select from the view is not guaranteed....

In fact, the TOP clause with the "ORDER BY", in this case, is just a filter and not a command to sort rows.
palotaiarpad
palotaiarpad
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Easy point! Smile
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