I want to achieve this -
SELECT * FROM A1234
I have the the ID 1234 saved in another table called Aliases which has two columns Alias,ID with one record like this.
Alias = TestTable, ID = 1234
So I am trying something like this
SELECT * FROM ('A'+ (SELECT ID FROM Aliases WHERE Alias = 'TestTable'))
Any help would be appreciated
You should use dynamic sql.
DECLARE #Q VARCHAR(MAX),#ID INT
SET #ID=(Select DISTINCT ID from Aliases where Alias = 'TestTable') -- CHECK TO RETURN JUST ON RESULT
SET #Q='SELECT * FROM A'+CAST(#ID AS VARCHAR(10))
EXEC(#Q)
You need dynamic SQL for this.
DECLARE #sql NVARCHAR(MAX);
SELECT TOP (1) #sql = N'SELECT * FROM A' + RTRIM(ID) + ';'
FROM dbo.Aliases WHERE Alias = 'TestTable';
EXEC sp_executesql #sql;
To build a set of statements that selects all of them, you can say:
DECLARE #sql NVARCHAR(MAX);
SET #sql = N'';
SELECT #sql = #sql + N'
SELECT *, ''A' + RTRIM(ID) + ''' FROM A' + RTRIM(ID) + ';'
FROM dbo.Aliases;
PRINT #sql;
-- EXEC sp_executesql #sql;
Related
I want to select the store procedure parameter as aliases in select statement in sql
example i have two parameter in store procedure
#programcode int,
#class int
Query where I want use those parameters as alias.
select programcode as #programcode from tbl_name
Why would you want a column alias to be a number?
In any case, you can write this as:
DECLARE #sql nvarchar(MAX);
SET #sql = N'
SELECT programcode AS [' + CAST(#programcode AS VARCHAR(MAX)) + ']
FROM tbl_name
';
EXEC sp_executesql #sql;
Numbers are not really recommended for column aliases, so they need to use escapes.
Try this query.
DECLARE #SqlText nvarchar(MAX);
SET #sqlText = N'SELECT programcode AS ' + CAST(#programcode AS VARCHAR(MAX)) + ' FROM tbl_name'
Exec (#sqlText)
i want have the layout of pivot table with on top period YYYYMM in dynamic table.
show sum of consumption per month show 1 year.
but when i tried put the data (period (201801,201802...)) don't work with PERIOD table on dynamic ?!!
i don't know if im doing something wrong on the report ...can anyone help withit ?
The query without be in dynamic and work but when I tried to change to dynamic I can't make it work.
DECLARE #ColumnNames NVARCHAR(MAX) = ' '
DECLARE #SQL NVARCHAR (MAX) = ' '
SELECT #ColumnNames += QUOTENAME(Period) + ','
FROM [STOKVIS LIVE].[dbo].[SR_CONS_Consumption1year]
SET #ColumnNames = LEFT (#ColumnNames,LEN(#ColumnNames)-1)
SET #SQL =
SELECT [No_] ,[Group],[Lakeview],[Name],[class.],[Stock], [Period]
FROM [STOKVIS LIVE].[dbo].[SR_CONS_Consumption1year]
PIVOT (
SUM ([Qty])
FOR [Period]
IN( ' + #ColumnNames + ')
)
as pivortable
You are executing 2 queries that require dynamic syntax - I've not tested but I think you could try something like this:
--Declare Variables
DECLARE #ColumnNames NVARCHAR(MAX) = NULL
DECLARE #SQL NVARCHAR(MAX)
-- First dynamic query
SET #SQL = N'
SELECT #ColumnNames += QUOTENAME(Period) + '',''
FROM [STOKVIS LIVE].[dbo].[SR_CONS_Consumption1year] ;';
--Execute dynamic query
EXEC sp_executesql #sql, N'#ColumnNames NVARCHAR(MAX)', #ColumnNames;
SET #ColumnNames = LEFT (#ColumnNames,LEN(#ColumnNames)-1)
--second dynamic query
SET #SQL = N'
SELECT [No_] ,[Group],[Lakeview],[Name],[class.],[Stock], [Period]
FROM [STOKVIS LIVE].[dbo].[SR_CONS_Consumption1year]
PIVOT (
SUM ([Qty])
FOR [Period]
IN( ' + #ColumnNames + ')
)
AS PivotTable ;';
EXEC sp_executesql #sql, N'#ColumnNames NVARCHAR(MAX) OUT', #ColumnNames OUT;
SELECT #TransType
EDIT
Added OUT in the past EXEC to identify they are output variables so you can use SELECT #TransType to get the result
What I wanted: I want to execute a procedure for each distinct entry in the table and display all the result in a single table.
What I did:
Declare #sql varchar(max)=''
Select #sql = #sql + ' exec proc1 ' + Convert(nvarchar(50),s1.product) + ';'
from (select distinct(s2.product) as product from sales s2) as s1;
exec (#sql)
What the problem is: it returns me n number of tables, n being number of distinct entries in the table. How do I union all of them?
I solved it. Thank you everyone.
Declare #sql varchar(max)='Declare #tempTable Table (product nvarchar(50) ); '
Select #sql = #sql + 'Insert into #tempTable exec proc1 ' + CONVERT(nvarchar(50),s1.product) + ';'
from (Select Distinct(s2.product) as product from Sales s2) as s1;
Set #sql = #sql + 'Select * from #tempTable';
Exec (#sql)
I want to write query in which name table will dynamicaly compute. I have code like this below. What should I put in 'magic code' region?
DECLARE #myTableName nvarchar(100) = 'sch'
+ CAST(#nowYear as VARCHAR(5))
+ 'Q'
+ CAST(#nowQuarter as VARCHAR(3))
+ '.[tVisits]'
-- magic code --
myTable = DoSomething(#aktTableName)
-- magic code --
SELECT * FROM myTable
I use MS SQL Server 2012
You need use the dynamic SQL -
DECLARE
#nowYear INT = 2013
, #nowQuarter INT = 1
DECLARE #myTableName NVARCHAR(100) = '[sch'
+ CAST(#nowYear AS VARCHAR(5))
+ 'Q'
+ CAST(#nowQuarter AS VARCHAR(3))
+ '].[tVisits]'
DECLARE #SQL NVARCHAR(MAX) = N'SELECT * FROM ' + #myTableName
EXEC sys.sp_executesql #SQL
Instead of SELECT * FROM myTable
You need to do something like
DECLARE #sql nvarchar(4000)
SELECT #sql = ' SELECT * FROM ' + #myTable -- #myTable is a string containing qualified table name
EXEC sp_executesql #sql
Note that sp_executesql allows for a parameterized query - check its documentation
I have multiple table names like g_str_a , g_str_ab , g_str_abc . I would like to drop all those tables that start with g_str on SQL Server 2008.
Will DROP Tables like 'g_str' help?
Please help me with the script.
SELECT
'DROP TABLE ' + QUOTENAME(SCHEMA_NAME(schema_id)) + '.' + QUOTENAME(name) + ';'
FROM sys.tables
WHERE name LIKE 'g\_str%' ESCAPE '\'
Then review the script and run it.
You can also concatenate the result into a single string and execute with EXEC if you need an entirely automated solution.
You could use dynamic SQL:
DECLARE #SQL NVARCHAR(MAX) = '';
SELECT #SQL = #SQL + 'DROP TABLE ' + QUOTENAME(SCHEMA_NAME([Schema_ID])) + '.' + QUOTENAME([name]) + ';'
FROM sys.tables
WHERE Name LIKE 'g\_str%' ESCAPE('\');
EXECUTE SP_EXECUTESQL #SQL;
Following query will delete tables automatically:
BEGIN TRANSACTION
DECLARE #tmpTablesToDelete TABLE (
RowNumber INT PRIMARY KEY
,Query NVARCHAR(MAX)
)
INSERT INTO
#tmpTablesToDelete
SELECT
RowNumber = ROW_NUMBER() OVER (ORDER BY (SELECT (0)))
,'DROP TABLE '+schemas.name+'.'+objects.name AS Query
FROM
sys.objects
INNER JOIN
sys.schemas
ON
schemas.schema_id = objects.schema_id
WHERE
type = 'U' AND objects.name like 'g_str%'
DECLARE #Counter INT
SELECT #Counter = MAX(RowNumber) FROM #tmpTablesToDelete
WHILE(#Counter > 0) BEGIN
DECLARE #Query NVARCHAR(MAX)
SELECT #Query = Query FROM #tmpTablesToDelete WHERE RowNumber = #Counter
PRINT #Query
EXEC sp_executesql #statement = #Query
SET #Counter = #Counter - 1
END
COMMIT TRANSACTION