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Inline Table Valued Function


Inline Table Valued Function

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Ed Wagner
Ed Wagner
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Excellent - thanks very much for the tip. I'm going to have to try this one.


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soulchyld21
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Thanks everyone, I eventually managed to solve it and will stick the code up sometime soon, Hopefully it will be acceptable :-D
ChrisM@Work
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Sean Lange (6/6/2013)
[quote][b]... In lieu of using a permanent table I use a view that creates the tally table on the fly. 0 reads to access it and I don't have to remember the syntax over and over....


It works well as an iTVF too!

ALTER FUNCTION [dbo].[InlineTally]
(@RowCount INT)
RETURNS TABLE WITH SCHEMABINDING AS
RETURN
(
WITH E1(N) AS (
SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL
SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL
SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
),
E2(N) AS (SELECT 1 FROM E1 a, E1 b, E1 c), -- 10 x 10 x 10 rows
E4(N) AS (SELECT 1 FROM E2 a, E2 b) --1000 x 1000 rows max

SELECT TOP (@RowCount) n = ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E4
)
GO
SELECT * FROM dbo.InlineTally (100000)



“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

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Exploring Recursive CTEs by Example Dwain Camps
Sean Lange
Sean Lange
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ChrisM@Work (6/7/2013)
Sean Lange (6/6/2013)
[quote][b]... In lieu of using a permanent table I use a view that creates the tally table on the fly. 0 reads to access it and I don't have to remember the syntax over and over....


It works well as an iTVF too!

ALTER FUNCTION [dbo].[InlineTally]
(@RowCount INT)
RETURNS TABLE WITH SCHEMABINDING AS
RETURN
(
WITH E1(N) AS (
SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL
SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL
SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
),
E2(N) AS (SELECT 1 FROM E1 a, E1 b, E1 c), -- 10 x 10 x 10 rows
E4(N) AS (SELECT 1 FROM E2 a, E2 b) --1000 x 1000 rows max

SELECT TOP (@RowCount) n = ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E4
)
GO
SELECT * FROM dbo.InlineTally (100000)



That is pretty cool too. Nice to have either option.

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Cross Tabs and Pivots, Part 1 – Converting Rows to Columns
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