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looping thru views


looping thru views

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rummings
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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.B
Alan.B
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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



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Erin,

Thank you very much for the information!

Charlie
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Alan,

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

Charlie
Alan.B
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rummings (3/11/2013)
Alan,

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

Charlie


Any time.

-- Alan Burstein



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kevaburg
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What about using sp_MSforeachview?
kevaburg
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What about using:

exec sp_MSforeachview 'select top 1 from ?'
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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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



Best practices for getting help on SQLServerCentral
Need to split a string? Try DelimitedSplit8K or DelimitedSplit8K_LEAD (SQL 2012+)
Need a pattern-based splitter? Try PatternSplitCM
Need to remove or replace those unwanted characters? Try PatExclude8K and PatReplace8K.

"I can't 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. " -- Itzek Ben-Gan 2001
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