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looping thru views


looping thru views

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rummings
rummings
SSCrazy
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I have a database with a large number of views. I would like to to be able to loop through the views and run a select on first record in each table from each of the views. Any advice or suggestions would be greatly appreciated.

Charlie
Erin Ramsay
Erin Ramsay
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This should get you started..

declare @strSQL varchar(max)
declare @viewName varchar(255)
declare listViews cursor for
select name from sys.views

open listViews
fetch next from listViews into @viewName

while @@fetch_status = 0
begin
set @strSQL = 'select top 1 * from ' + @viewName
exec (@strSQL)
fetch next from listViews into @viewName
end

close listViews
deallocate listViews


Alan Burstein
Alan Burstein
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Cursors, loops and dSQL fall under the last choice column but this is one of those cases...

For tables you would do this:

EXEC sp_MSforeachtable'SELECT TOP 1 * FROM ?'



For views:


SET NOCOUNT ON;
GO

IF OBJECT_ID('tempdb..#views') IS NOT NULL
DROP TABLE #views;

;WITH views AS
( SELECT ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS n,
TABLE_NAME FROM INFORMATION_SCHEMA.VIEWS)
SELECT n, table_name
INTO #views
FROM views;
GO

--SELECT * FROM #views

DECLARE @n int=1,
@tbl varchar(100),
@sql varchar(400)='SELECT TOP 1 * FROM ';


WHILE @n<=(SELECT MAX(n) FROM #views)
BEGIN
SELECT @tbl=(SELECT TABLE_NAME FROM #views WHERE n=@n);

EXEC('SELECT '''+@tbl+''' AS [THE TABLE]');
EXEC(@sql+@tbl);

SELECT @n=@n+1
END


DROP TABLE #views;



-- Alan Burstein


Helpful links:

Best practices for getting help on SQLServerCentral -- Jeff Moden
How to Post Performance Problems -- Gail Shaw

Nasty fast set-based string manipulation functions:
For splitting strings try DelimitedSplit8K or DelimitedSplit8K_LEAD (SQL Server 2012+)
To split strings based on patterns try PatternSplitCM
Need to clean or transform a string? try NGrams, PatExclude8K, PatReplace8K, DigitsOnlyEE, or Translate8K

I cant stress enough the importance of switching from a sequential files mindset to set-based thinking. After you make the switch, you can spend your time tuning and optimizing your queries instead of maintaining lengthy, poor-performing code. -- Itzik Ben-Gan 2001

rummings
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Erin,

Thank you very much for the information!

Charlie
rummings
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Alan,

Thank you for the code.... it worked great!

Charlie
Alan Burstein
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rummings (3/11/2013)
Alan,

Thank you for the code.... it worked great!

Charlie


Any time.

-- Alan Burstein


Helpful links:

Best practices for getting help on SQLServerCentral -- Jeff Moden
How to Post Performance Problems -- Gail Shaw

Nasty fast set-based string manipulation functions:
For splitting strings try DelimitedSplit8K or DelimitedSplit8K_LEAD (SQL Server 2012+)
To split strings based on patterns try PatternSplitCM
Need to clean or transform a string? try NGrams, PatExclude8K, PatReplace8K, DigitsOnlyEE, or Translate8K

I cant stress enough the importance of switching from a sequential files mindset to set-based thinking. After you make the switch, you can spend your time tuning and optimizing your queries instead of maintaining lengthy, poor-performing code. -- Itzik Ben-Gan 2001

kevaburg
kevaburg
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What about using sp_MSforeachview?
kevaburg
kevaburg
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What about using:

exec sp_MSforeachview 'select top 1 from ?'
Sean Lange
Sean Lange
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Keep in mind that all of the code samples are using top 1 with no order by. If you require the "first" record to be meaningful you will need to add this order by. If on the other hand you just want any given row from the view this will work.

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Alan Burstein
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kevaburg (3/14/2013)
What about using:

exec sp_MSforeachview 'select top 1 from ?'


That is not a stored proc that comes from SQL Server. If you can run this:

exec sp_MSforeachview 'select top 1 from ?



Its because someone created that locally.

-- Alan Burstein


Helpful links:

Best practices for getting help on SQLServerCentral -- Jeff Moden
How to Post Performance Problems -- Gail Shaw

Nasty fast set-based string manipulation functions:
For splitting strings try DelimitedSplit8K or DelimitedSplit8K_LEAD (SQL Server 2012+)
To split strings based on patterns try PatternSplitCM
Need to clean or transform a string? try NGrams, PatExclude8K, PatReplace8K, DigitsOnlyEE, or Translate8K

I cant stress enough the importance of switching from a sequential files mindset to set-based thinking. After you make the switch, you can spend your time tuning and optimizing your queries instead of maintaining lengthy, poor-performing code. -- Itzik Ben-Gan 2001

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