Dynamic SQL And Table Names

Jun 5, 2008

Hi all,

I have been attempting to construct some dynamic SQL using a table name as a parameter, and call it using sp_executesql, in SQL Server 2005.

According to all of the searches and articles I have read today, the following should work:

DECLARE @rownumINT
DECLARE @tabNamNVARCHAR(100)
DECLARE @SQLStringNVARCHAR(500)
DECLARE @ParmDefinition NVARCHAR(500)

SET @rownum = 35
SET @tabNam = 'AdminScriptHistory'

SELECT @SQLString = N'SELECT * FROM @table where executionorder=@row'
SET @ParmDefinition = N'@table VARCHAR(100), @row INT'

EXEC sp_executesql @SQLString, @ParmDefinition, @tabNam,@rownum

However, it fails with:

Msg 1087, Level 15, State 2, Line 1
Must declare the table variable "@table".

Anybody know why?

Cheers

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Dynamic Table Names In Stored Procedure...

Jul 2, 2007

Hello all,

Im just wondering... is there any way to have dynamic table names, so that, say for instance, i have 4 stored procedures, that all do the same thing, just to four different tables. is there any way to have 1 stored procedure, and pass through the table name???

Adding the four statements into one statement is not an option, as i only need to execute one at a time..., not all four at once...

Cheers,
Justin

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Mar 9, 2015

I have query which is used to dynamically insert value but not working. We are trying to get all table names and insert dynamically to all tables by looping through table names.

declare @a varchar(max),@i int;
declare @table table(rno int, name varchar(max))
declare @b varchar(max)
insert into @table
select row_number() over( order by table_name) rno, table_name from INFORMATION_SCHEMA.tables
declare @tblname varchar(max)

[Code] .....

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Sep 16, 2015

I don't know why this is so difficult. What I want to do is take a table name as a parameter to build a query and get an integer value from the result of the query. But from all of the research I have been doing, Dynamic SQL is bad in SQL server because of SQL Injections. But my users are not going to be supplying the table names.

Things I have learned:

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 - SQL Functions can return a concatenated string that could be used by a stored procedure to Exec the query string.

So how can I write a stored procedure that will
 
1. take a parameter
2. Pass the parameter to a function that will return a string
3. Execute that string as SQL
4. Get a return value from that SQL statement
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Numbers 3, 4, and 5 are where I am really stuck. I guess I don't know the proper syntax and limitations of SQL Server.

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Mar 1, 2015

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Jan 22, 2004

Hi

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Thanks.

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Jan 1, 2008

Hello,I'm still extremely novice to SQL and I've tried googling how to produce this result but I've been encountering a lot dynamic sql commands which isn't exactly what I want. If this is an ignorant question I do apologize but heres my scenario: I have a table with columns of the day, for instance: Monday_hasData (bit)Monday_DataAnd what I want to do is essentially pass in "Monday" as a parameter and rather than doing an If statement on each row, I would like to just like to do something like assign @dayCheck + "_hasData" to a variable and then use @dayCheck as part of my query.  Is this possible or am I going to have to have 7 cases? Thank you for any input,Chance 

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Jun 10, 2004

Hi is possible to create dynamic column name
example
Declare
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select
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Dynamic Column Names

Jan 19, 2005

thanx for the help in advance,

i have a table with Monday, Tuesday, Wednesday. .... Sunday

i get the weekday by
select @stat = datename(dw, getdate()) which in this case is Wednesday

but when i do something like

select top 2 * from myTable
where 'myTable.'+@stat = 1

which is as same as

select top 2 * from myTable
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i receive a syntax error. how can i dynamically select myTable.Wednesday ?

i also tried using
select top 2 * from Intercon
where '@stat' = '1'

but then this doesn't return anything where it should.
any help?

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Aug 28, 2007

Got my first real job to do in SSIS and it's not really much fun. Here goes. I have excel files from various vendors, none of which are in the same format. Now I'm less concerned with the names, I have those in variables so that's not a big deal. My issue is around the column names. Let's say we have file a, b and c. In file a the first name field is called [first name], in file b it's first_name and in file c it's firstname. What I want to do is create 1 package that can handle these files regardless of how first name is spelled. I was thinking I could open the file and somehow search for a column name that contained the word "first%" and then map the column name to a variable. I'm sort of stuck though on how to actually do that. Help. And please don't tell me to tell the vendors to standardize. That's the end goal but it's like herding cats.

Mike
"oh, that monkey is going to pay"

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Aug 9, 2007

Hi guys 'n gals,

I am trying to achieve something a bit complex (or at least appears to be for me).

I have the following table structure:

UID, GroupID, ColumnName, ColumnValue

here is some example data:

UID, GroupId, ColumnName, ColumnValue
1, 1, MAC Address, 8a7sd87sad
2, 1, IP Address, 192.168.1.100
3, 1, Name, John
4, 2, MAC Address, 09a8sd098as
5, 2, Name, Steven

and here is what I would like the example to come out like:


GroupID, MAC Address, IP Address, Name
1, 8a7sd87sad, 192.168.1.100, John
2, 09a8sd098as, NULL, Steven

It needs to be completely dynamic though, as a new column name could be entered to the source table at any time...

I have tried Dynamic SQL and JOINs, but can only seem to get it to work correctly. I was starting to consider doing a loop similar to this:





Code Snippet

DECLARE @ColumnName varchar(128)
DECLARE @Sql varchar(255)
SELECT @ColumnName = [ColumnName] FROM tblSourceData
SELECT @Sql = 'SELECT [GroupId], [ColumnValue] AS ['+@ColumnName+'] FROM tblSourceData'
EXEC (@Sql)

Could somebody please point me in the right direction? I've heard a bit about Pivot tables in my search for this solution, is that perhaps the route I need to go?

Regards,
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I have a quick question on SQL Server. Lets say I have table Order which has column names OrderId, CustomerName, OrderDate and NumberofItems. To select the OrderID values from the table I say
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Hi
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How can query be written for this. Also there are many stored procedures which will access this table. In these stored procedures i will send username as an input. Then the query in the stored procedure shd access the table as A_Username .
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Aug 3, 2007

I am trying to do a PIVOT on a query result, but the column names created by the PIVOT function are dynamic.

For example (modified from the SQL Server 2005 Books Online documentation on the PIVOT operator) :

SELECT
Division,
[2] AS CurrentPeriod,
[1] AS PreviousPeriod
FROM
(
SELECT
Period,
Division,
Sales_Amount
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(
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) p
PIVOT
(
SUM (Sales_Amount)
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Let's assume that any value 2 is selected for the @period parameter, and returns the sales by division for periods 2 and 1 (2 minus 1).

Division CurrentPeriod PreviousPeriodA 400 3000 B 400 100 C 470 300 D 800 2500 E 1000 1900

What if the value @period were to be changed, to say period 4 and it should returns the sales for periods 4 and 3 for example, is there a way I can change to code above to still perform the PIVOT while dynamically accepting the period values 4 and 3, applying it to the columns names in the first SELECT statement and the FOR ... IN clause in the PIVOT statement ?

Need a way to represent the following [2] and [1] column names dynamically depending on the value in the @period parameter.

[2] AS CurrentPeriod,
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FOR Period IN ( [2], [1] )

I have tried to use the @period but it doesn't work.

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Jul 3, 2007

Folks,



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With DTSs I would create an ActiveX script to execute the procedure which loads the results into a temp table. After that I would select everything from this temp table and load the results into a record set, looping through this record set to create the destination spreadsheet with the dynamic column names.

When it comes to SSIS we are advised to write vb.net scripts instead of ActiveX... These ones do not have records set's but dataset's, which at first glance are only applicable to xml and not xls files (when I try to define a variable as a dataset in my vb.net code, I face a message saying: Missing reference required to assembly System.Xml...).

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Thank you.



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I would like to provide the names of columns in an insert statement from a schema table, so that when running through a number of Bus Rule checks I can reference the schema table and only maintain the columns in the schema table rather than maintain named columns in multiple insert statements. So my query for one check looks like below. I'm using dynamic sql to execute the insert statement. My question is, is there a better way or different way to do this without using dynamic sql? Ie, Is there a way that I can use the columns parameter like this instead?

Insert
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Dynamic code:

Declare @columns as nvarchar(max);
Declare @InvSQL as nvarchar(max);
SELECT @columns =
STUFF ((
SELECT ', [' + name + ']'
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[Code] ....

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My intention is to create only 1 variable and evaluate the expression based on the conditional expression description. Is this possible?

Regards

RH




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Jan 21, 2004

I'm trying to do an update query that looks like this:

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PAEMPLOYEE

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Hello,
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Apr 10, 2008

How do I use table names stored in variables in stored procedures?




Code Snippetif (select count(*) from @tablename) = 0 or (select count(*) from @tablename) = 1000000





I receive the error 'must declare table variable '@tablename''

I've looked into table variables and they are not what I would require to accomplish what is needed.
After browsing through the forums I believe I need to use dynamic sql particuarly involving sp_executesql. However, I am pretty new at sql and do not really understand how to use this and receive an output parameter from it(msdn kind of confuses me too). I am tryin got receive an integer count of the records from a certain table which can change to anything depending on what the user requires.




Code Snippet

if exists(Select * from sysobjects where name = @temptablename)
drop table @temptablename




It does not like the 'drop table @temptablename' part here. This probably wouldn't be an issue if I could get temporary tables to work, however when I use temporary tables i get invalid object '#temptable'.

Heres what the stored procedure does.
I duplicate a table that is going to be modified by using 'select into temptable'
I add the records required using 'Insert into temptable(Columns) Select(Columns)f rom TableA'
then I truncate the original table that is being modified and insert the temporary table into the original.

Heres the actual SQL query that produces the temporary table error.




Code Snippet
Select * into #temptableabcd from TableA

Insert into #temptableabcd(ColumnA, ColumnB,Field_01, Field_02)
SELECT ColumnA, ColumnB, Sum(ABC_01) as 'Field_01', Sum(ABC_02) as 'Field_02',
FROM TableB
where ColumnB = 003860
Group By ColumnA, ColumnB

TRUNCATE TABLE TableA

Insert into TableA(ColumnA, ColumnB,Field_01, Field_02)
Select ColumnA, ColumnB, Sum(Field_01) as 'Field_01', Sum('Field_02) as 'Field_02',
From #temptableabcd
Group by ColumnA, ColumnB




The above coding produces

Msg 208, Level 16, State 0, Line 1

Invalid object name '#temptableabcd'.

Why does this seem to work when I use an actual table? With an actual table the SQL runs smoothly, however that creates the table names as a variable problem from above. Is there certain limitation with temporary tables in stored procedures? How would I get the temporary table to work in this case if possible?

Thanks for the help.


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[code]....

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END

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I like to print the table names that starts with 'table'.
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create table table1(tableID int, tableName varchar (30))
insert table1
select 1, 'tableSam' union all
select 2, 'tableDaniel' union all
select 3, 'tableRon' union all
select 4, 'tableKen' union all
select 5, 'tableHonda'

create table table2(tableID int, tableName varchar (30))
insert table2
select 6, 'tableSam' union all
select 7, 'tableDaniel' union all
select 8, 'tableRon' union all
select 9, 'tableKen' union all
select 10, 'tableHonda'

create table table3(tableID int, tableName varchar (30))
insert table3
select 11, 'tableSam' union all
select 12, 'tableDaniel' union all
select 13, 'tableRon' union all
select 14, 'tableKen' union all
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create table table4 (tableID int, tableName varchar (30))
insert table4
select 16, 'tableSam' union all
select 17, 'tableDaniel' union all
select 18, 'tableRon' union all
select 19, 'tableKen' union all
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declare @string varchar(330)
declare @tableName varchar(30)
declare @count int
set @count = 0

while (@count < 5)
begin

select @tableName = table_name from information_schema.tables
where table_name like 'table%'

exec(@string)
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