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Changing from "hard-coded" to dynamic query


Changing from "hard-coded" to dynamic query

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momba
momba
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Hi. My name is Momba and I'm a T-SQL noob....

So I've got the following hard-coded query:
select * TableCurrent 
WHERE BRANCHID='950' AND (DISC_DTE IS NULL OR DISC_DTE > 20070630)
union
select * from Table_2007_2008
WHERE BRANCHID='950' AND (DISC_DTE IS NULL OR DISC_DTE > 20070630)
union
select * from Table_2008_2009
WHERE BRANCHID='950' AND (DISC_DTE IS NULL OR DISC_DTE > 20070630)
union
select * from Table_2009_2010
WHERE BRANCHID='950' AND (DISC_DTE IS NULL OR DISC_DTE > 20070630)
union
select * from Table_2010_2011
WHERE BRANCHID='950' AND (DISC_DTE IS NULL OR DISC_DTE > 20070630)
union
select * from Table_2011_2012
WHERE BRANCHID='950' AND (DISC_DTE IS NULL OR DISC_DTE > 20070630)



At the end of each fiscal year (June 30th) a new archive is made of the current table and I end up having to dig through everything to get what I need. And this is my best attempt to making it dynamic:

Use TableCurrent

Declare @loopYrbeg int
Declare @loopYrend int
Declare @tablename sysname
Declare @SQL varchar(MAX)

Set @loopYrbeg = 2007

begin

While @loopYrbeg < year( getdate() )

      begin

       Set @loopYrend = @loopYrbeg + 1
       Set @tablename = 'Table_' + CONVERT(varchar(4), @loopYrbeg) + '_' + CONVERT(varchar(4), @loopYrend)
       Set @sql = 'select *
       from ' + @tablename +char(10)+
       'WHERE BRANCHID='950' AND (DISC_DTE IS NULL OR DISC_DTE > 20070630)'+char(10)+
       'union'+char(10)

          Set @loopYrbeg = @loopYrbeg + 1

      end

exec (@sql)

select * TableCurrent
WHERE BRANCHID='950' AND (DISC_DTE IS NULL OR DISC_DTE > 20070630)

end





...Unfortunately my best attempt doesn't work as it should. Please advise. Thank you.
toddasd
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This will fix what you have:


Declare @loopYrbeg int
Declare @loopYrend int
Declare @tablename sysname
Declare @SQL varchar(MAX)

Set @loopYrbeg = 2007
Set @sql = ''

begin
   While @loopYrbeg < year( getdate() )
   begin
      Set @loopYrend = @loopYrbeg + 1
      Set @tablename = 'Table_' + CONVERT(varchar(4), @loopYrbeg) + '_' + CONVERT(varchar(4), @loopYrend)
      Set @sql = @sql + 'select * from ' + @tablename +char(10)+
             'WHERE BRANCHID=''950'' AND (DISC_DTE IS NULL OR DISC_DTE > 20070630)' + char(10) +
             'union' + char(10)
      Set @loopYrbeg = @loopYrbeg + 1
   end
set @SQL = left(@sql, LEN(@sql) - 6)
print (@sql)

end



______________________________________________________________________________
How I want a drink, alcoholic of course, after the heavy lectures involving quantum mechanics.
momba
momba
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Yes, this is getting really close (thank you)... but how do I union the current table with all the archives?

i.e.

select * TableCurrent
WHERE BRANCHID='950' AND (DISC_DTE IS NULL OR DISC_DTE > 20070630


...which doesn't have a fiscal year in its name.
toddasd
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Just initialize the string with that query, like so:


Declare @loopYrbeg int
Declare @loopYrend int
Declare @tablename sysname
Declare @SQL varchar(MAX)

Set @loopYrbeg = 2007
Set @sql = 'select * from tableCurrent ' + char(10) +
             'WHERE BRANCHID=''950'' AND (DISC_DTE IS NULL OR DISC_DTE > 20070630)' + char(10) +
             'union' + char(10);

While @loopYrbeg < year( getdate() )
begin
   Set @loopYrend = @loopYrbeg + 1;
   Set @tablename = 'Table_' + CONVERT(varchar(4), @loopYrbeg) + '_' + CONVERT(varchar(4), @loopYrend);
   Set @sql = @sql + 'select * from ' + @tablename +char(10)+
          'WHERE BRANCHID=''950'' AND (DISC_DTE IS NULL OR DISC_DTE > 20070630)' + char(10) +
          'union' + char(10);
   Set @loopYrbeg = @loopYrbeg + 1;
end
set @SQL = left(@sql, LEN(@sql) - 6);
print (@sql);



______________________________________________________________________________
How I want a drink, alcoholic of course, after the heavy lectures involving quantum mechanics.
momba
momba
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Ohhhhh (duh). That makes sense.

Thank you!!!! :-D
Lynn Pettis
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This:



declare @StartYear int = 2007,
@SQLCmd nvarchar(max);

with quickTally(n) as (select top(year(dateadd(mm,6,getdate())) - @StartYear - 1) n from (values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9),(10))dt(n))
select
@SQLCmd = stuff((select char(13) + char(10) +
'select * from Table_' +
cast(@StartYear + n as varchar) + '_' + cast(@StartYear + n + 1 as varchar) +
' where branchid = ''950'' and (disc_dte is null or disc_dte > ''20070630'') union all'
from
quickTally
for xml path(''),TYPE).value('.','nvarchar(max)'),1,2,'') +
char(13) + char(10) + 'select * from TableCurrent where branchid = ''950'' and (disc_dte is null or disc_dte > ''20070630'');'
;
print @SQLCmd;




Cool
Lynn Pettis

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Sean Lange
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Depending on how often you will be running this query you might consider using sp_executesql instead of the more generic exec. It will cache your execution plan and more importantly it allows for parameters.

http://www.sqlskills.com/blogs/kimberly/exec-and-sp_executesql-how-are-they-different/

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momba
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... I came across one last issue. How can I make the " While @loopYrbeg < year ( getdate() )" statement conditional?

More specifically IF month ( getdate() ) < 7
THEN @loopYrbeg < year ( getdate() ) - 1
ELSE @loopYrbeg < year ( getdate() )
Lynn Pettis
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Sean Lange (1/25/2013)
Depending on how often you will be running this query you might consider using sp_executesql instead of the more generic exec. It will cache your execution plan and more importantly it allows for parameters.

http://www.sqlskills.com/blogs/kimberly/exec-and-sp_executesql-how-are-they-different/


This:



declare @StartYear int = 2007,
@SQLCmd nvarchar(max),
@Params nvarchar(max);
set @Params = N'@BranchID varchar(10), @DiscDate date');

with quickTally(n) as (select top(year(dateadd(mm,6,getdate())) - @StartYear - 1) n from (values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9),(10))dt(n))
select
@SQLCmd = stuff((select char(13) + char(10) +
'select * from Table_' +
cast(@StartYear + n as varchar) + '_' + cast(@StartYear + n + 1 as varchar) +
' where branchid = @BranchID and (disc_dte is null or disc_dte > @DiscDate) union all'
from
quickTally
for xml path(''),TYPE).value('.','nvarchar(max)'),1,2,'') +
char(13) + char(10) + 'select * from TableCurrent where branchid = @BranchID and (disc_dte is null or disc_dte > @DiscDate);'
;
print @SQLCmd;

exec sp_executesql @SQLCmd, @params = @Params, @BatchID = '950', @DiscDate = '20070630';




Cool
Lynn Pettis

For better assistance in answering your questions, click here
For tips to get better help with Performance Problems, click here
For Running Totals and its variations, click here or when working with partitioned tables
For more about Tally Tables, click here
For more about Cross Tabs and Pivots, click here and here
Managing Transaction Logs

SQL Musings from the Desert Fountain Valley SQL (My Mirror Blog)
Lynn Pettis
Lynn Pettis
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Group: General Forum Members
Points: 24155 Visits: 37923
momba (1/25/2013)
... I came across one last issue. How can I make the " While @loopYrbeg < year ( getdate() )" statement conditional?

More specifically IF month ( getdate() ) < 7
THEN @loopYrbeg < year ( getdate() ) - 1
ELSE @loopYrbeg < year ( getdate() )



No loops required.

Cool
Lynn Pettis

For better assistance in answering your questions, click here
For tips to get better help with Performance Problems, click here
For Running Totals and its variations, click here or when working with partitioned tables
For more about Tally Tables, click here
For more about Cross Tabs and Pivots, click here and here
Managing Transaction Logs

SQL Musings from the Desert Fountain Valley SQL (My Mirror Blog)
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