I'm trying to run the following Dynamic SQL statement:
#Tbl, #Fld, and #LookupValue have all been set according to Table to search, Field (Or Column) to search and column value to compare.
DECLARE #Sql AS VARCHAR(500)
SET #Sql = 'SELECT COUNT(*)
FROM ' + #Tbl +
' WITH (NOLOCK)
WHERE ' + #Fld + ' = ''' + #LookupValue + ''''
EXEC(#Sql)
I want to store the result into a variable so I can check to see if there are any returned rows. This statement is in the middle of a WHILE construct that is checking several tables and fields.
If records are found, then I want to display:
SET #Sql = 'SELECT ' + #Fld +
' FROM ' + #Tbl +
' WITH (NOLOCK)
WHERE ' + #Fld + ' = ''' + #LookupValue + ''''
EXEC(#Sql)
Yes, you can store it in a typed variable and use sp_executesql like
DECLARE #Sql AS NVARCHAR(500);
DECLARE #cnt INT;
SET #Sql = 'SELECT #cnt = COUNT(*)
FROM ' + #Tbl +
' WITH (NOLOCK)
WHERE ' + #Fld + ' = ''' + #LookupValue + '''';
EXEC sp_executesql #Sql, N'#cnt INT OUTPUT', #cnt OUTPUT;
SELECT #cnt;
you can create a temporary table and store the count value.
if object_id('tempdb.#mycount') is null
create table #mycount ( countVal int);
DECLARE #Sql AS VARCHAR(500)
SET #Sql = 'INSERT INTO #mycount
SELECT COUNT(*)
FROM ' + #Tbl +
' WITH (NOLOCK)
WHERE ' + #Fld + ' = ''' + #LookupValue + ''''
EXEC(#Sql)
select countVal from #mycount
-- once the temp table usage is done, you can delete it
drop table #mycount
Related
I was trying to pass table name and column name dynamic, this is as part of SSIS process I am trying this stored procedure below.
CREATE PROCEDURE [lnd].[Get_ANCNotullColumn]
(#PassedTableName AS NVarchar(255),
#PassedColumnName AS NVARCHAR(100))
AS
BEGIN
DECLARE #ActualTableName AS NVarchar(255)
SELECT #ActualTableName = QUOTENAME( TABLE_NAME )
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME = #PassedTableName
DECLARE #sql AS NVARCHAR(MAX)
SELECT #sql = 'SELECT COUNT(*) FROM ' + #ActualTableName + ';'
DECLARE #final AS NVARCHAR(MAX)
SELECT #final = #sql + 'WHERE ' + #PassedColumnName + ' IS NULL OR ' + #PassedColumnName + '='''
EXEC(#SQL)
END
On executing this, I am NOT getting count as result, instead I am getting execution success.
EXEC [lnd].[Get_ANCNotullColumn] 'lnd.ANC_LND_ItemOverride', 'comments'
I need to get the count as output.
Also my simple direct query is like this
SELECT COUNT(*)
FROM lnd.ANC_LND_ItemOverride
WHERE Comments IS NULL OR Comments = '' -- 3 is the output
I think you may need to modify you value passing and your concatenation values.
from this statement you need to remove the semi colon as it will throw error
SELECT #sql = 'SELECT COUNT(*) FROM ' + #ActualTableName + ';'
While passing blank values you need additional quotes
SELECT #final = #sql + 'WHERE ' + #PassedColumnName + ' IS NULL OR ' + #PassedColumnName + '= '''''
While execution I believe you wanted to execute final instead of SQL
I think below should give your output:
CREATE PROC [lnd].[Get_ANCNotullColumn]( #PassedTableName as NVarchar(255),#PassedColumnName AS
NVARCHAR(100))
AS
BEGIN
DECLARE #ActualTableName AS NVarchar(255)
SELECT #ActualTableName = QUOTENAME( TABLE_NAME )
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME = #PassedTableName
DECLARE #sql AS NVARCHAR(MAX)
SELECT #sql = 'SELECT COUNT(*) FROM ' + #ActualTableName + ' '
DECLARE #final AS NVARCHAR(MAX)
SELECT #final = #sql + 'WHERE ' + #PassedColumnName + ' IS NULL OR ' + #PassedColumnName + '='''''
EXEC(#final)
END
I am trying to insert data into a SQL Server table using a variable. I tried
DECLARE #table NVARCHAR(50) = 'ToolList',
#val NVARCHAR(50) = 'test'
EXEC ('INSERT INTO ' + #table + 'SELECT ' + #val)
and
EXEC ('INSERT INTO ' + #table + '([col1]) VALUES(' + #val +')'
but still get an error that says
Incorrect syntax near 'test'.
you missed a space before SELECT and the #val should enclosed in single quote
DECLARE #table nvarchar(50) = 'ToolList',
#val nvarchar(50) = 'test'
EXEC ( 'INSERT INTO ' + #table + ' SELECT ''' + #val + '''')
when you use Dynamic SQL, it is easier to form the query in a variable so that you can print out , inspect the value before execution
select #sql = 'INSERT INTO ' + #table + ' SELECT ''' + #val + ''''
print #sql
exec (#sql)
You'd better use sp_executesql that allows for statements to be parameterized, to avoid the risk of SQL injection.
DECLARE #Query NVARCHAR(1000),
#table NVARCHAR(50) = 'ToolList'
SET #Query = 'INSERT INTO ' + #table + ' SELECT #val'
EXEC sp_executesql #Query, N'#val nvarchar(50)', #val = 'test'
sp-executesql-transact-sql
You can also use CHAR(39) instead of adding single quotes every time for better readability. And also, you have not added a space after the variable which contains the table name.
Query
declare #table nvarchar(50) = 'ToolList',
#val nvarchar(50) = 'test2';
declare #sql as varchar(max) = 'insert into ' + #table
+ ' select ' + char(39) + #val + char(39);
exec(#sql);
You need 4 singlequotes before the #val field as it is a string and all strings needs to be encapsulated in single quotes.
You can print the dynamic string using PRINT command check what the final string you are going to execute.
DECLARE #table VARCHAR(50) = 'ToolList'
DECLARE #val VARCHAR(50) = 'test'
DECLARE #DSQL AS VARCHAR(MAX) = ''
SET #DSQL = #DSQL + ' INSERT INTO [' + #table + ']' + '
SELECT ' + '''' + #val + ''''
--PRINT #DSQL
EXEC(#DSQL)
I have following table and values,
Tb_name column_name1 column_name2
Citator_KTLO_CC Date_Created Date_Modified
Citator_KTLO_QA Date_Created Date_Modified
I want to select dynamically column from table, so the result is like this:
Select Date_Created,Date_Modified from Citator_KTLO_CC
and in next loop it will select for second row, like
Select Date_Created,Date_Modified from Citator_KTLO_QA
How can i do this by using dynamic sql ?
any example are appreciated.
here is an example of how to do this.
Since you dont post many info I just assume that the table containing all the tablenames is called 'tables'
Also this will only work if all tables have the same column types.
-- create a test table you dont need this
create table tables (tb_name varchar(100) primary key, field1 varchar(100), field2 varchar(100))
-- fill my test table you dont need this
insert into tables values ('table1', 'field1', 'field2')
insert into tables values ('table2', 'foo1', 'foo2')
insert into tables values ('table3', 'test1', 'test2')
-- this is the actual code you need, replace the names with your real names
declare #sql varchar(max) = ''
declare #tb_name varchar(100) = ''
declare #field1 varchar(100) = ''
declare #field2 varchar(100) = ''
declare myCursor cursor for
select tb_name, field1, field2 from tables -- dont know how your table is called
open myCursor
fetch next from myCursor into #tb_name, #field1, #field2
while ##FETCH_STATUS = 0
begin
set #sql = #sql + ' select ' + #field1 + ', ' + #field2 + ' from ' + #tb_name + ' union all '
fetch next from myCursor into #tb_name, #field1, #field2
end
close myCursor
deallocate myCursor
select #sql = left(#sql, len(#sql) - 10)
exec (#sql)
EDIT:
using a where clause is possible but things will get more complicated
declare #something date = getdate()
set #sql = #sql + ' select ' + #field1 + ', ' + #field2 + ' from ' + #tb_name + ' where ' + #field1 + ' = ' + #something + ' union all '
You can use the example above to build what you need just play with it.
EDIT:
using a where clause with a date format
declare #something date = getdate()
set #sql = #sql + ' select ' + #field1 + ', ' + #field2 + ' from ' + #tb_name + ' where ' + #field1 + ' = ''' + CONVERT(varchar(8), #something, 112) + ''' union all '
DECLARE #SQL VARCHAR(1000);
SET #SQL = '
SELECT *
FROM Citator_KTLO_CC
UNION ALL
SELECT *
FROM Citator_KTLO_QA;'
EXEC (#SQL);
How about something like this. If you've more than two cols, you can use dynamic sql to generate a list of cols to then generate more dynamic sql instead of hard coding.
DROP TABLE #Test
CREATE TABLE #Test
(Tb_name NVARCHAR(15),
column_name1 NVARCHAR(12),
column_name2 NVARCHAR(13));
INSERT INTO #Test VALUES
('Citator_KTLO_CC','Date_Created','Date_Modified'),
('Citator_KTLO_QA','Date_Created','Date_Modified');
DECLARE #SQL NVARCHAR(MAX)
SET #SQL = (SELECT STUFF((SELECT ' UNION ALL SELECT ' + Cols + ' FROM '+TbL
FROM (SELECT QUOTENAME(Tb_name) TBL,
QUOTENAME(column_name1) + ', '+
QUOTENAME(column_name2) Cols
FROM #Test) Blah
FOR XML PATH('')),1,10,''))
PRINT #SQL
EXEC sys.sp_executesql #SQL
Try this..
For selecting one row if you are running in aloop
DECLARE #sql NVARCHAR(4000)
SELECT #sql = ' select ' + column_name_1 + ',' + column_name2 + ' from ' + Tb_name
FROM < yourtable >
EXEC (#sql)
OR
DECLARE #sql NVARCHAR(4000)
SELECT #sql = 'union all select ' + column_name_1 + ',' + column_name2 + ' from ' + Tb_name
FROM < yourtable >
SET #sql =stuff(#sql,1,10,'')
EXEC (#sql)
DECLARE #ColumnList1 VARCHAR(MAX) = '''''';
DECLARE #ColumnList2 VARCHAR(MAX) = '''''';
DECLARE #ColumnNameFromTable1 VARCHAR(50);
DECLARE #ColumnNameFromTable2 VARCHAR(50);
DECLARE MyCursor1 CURSOR
FOR
SELECT COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'Citator_KTLO_CC'
ORDER BY ORDINAL_POSITION
DECLARE MyCursor2 CURSOR
FOR
SELECT COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'Citator_KTLO_QA'
ORDER BY ORDINAL_POSITION
OPEN MyCursor1
OPEN MyCursor2
FETCH NEXT FROM MyCursor1 INTO #ColumnNameFromTable1;
WHILE ##FETCH_STATUS = 0
BEGIN
FETCH NEXT FROM MyCursor2 INTO #ColumnNameFromTable2;
SET #ColumnList1 = #ColumnList1 + ',' + #ColumnNameFromTable1
SET #ColumnList2 = #ColumnList2 + ',' + #ColumnNameFromTable2
FETCH NEXT FROM MyCursor1 INTO #ColumnNameFromTable1;
END
CLOSE MyCursor1;
DEALLOCATE MyCursor1;
CLOSE MyCursor2;
DEALLOCATE MyCursor2;
EXEC ('SELECT ' + #ColumnList1 + ' FROM Citator_KTLO_CC UNION ALL SELECT ' +
#ColumnList2 + ' FROM Citator_KTLO_QA ')
I have a field namely Modified_Dt of type Datetime in all of my tables, to keep track of last modified date and time for a record.
Now, let's say I need to know which tables has records that has been modified recently(like today).
How do I write a query for that? How do I query multiple tables?
By the way, I am using MS SQL Server 2008 R2.
USE MASTER
GO
DECLARE #ObjectName NVARCHAR(255)
DECLARE TablesList CURSOR
FOR select object_name(object_id, db_id('DBStackExchange'))
from [DBStackExchange].sys.columns
where name = 'Modified_Dt'
OPEN TablesList
FETCH NEXT FROM TablesList INTO #ObjectName
WHILE ##FETCH_STATUS = 0
BEGIN
exec
( 'If exists ( SELECT 1 FROM DBStackExchange.dbo.[' + #ObjectName
+ ']
Where convert(varchar(20),Modified_Dt,103)>=convert(varchar(20),getdate(),103))
Print ''' + #ObjectName + '''
'
)
FETCH NEXT FROM TablesList INTO #ObjectName
END
CLOSE TablesList
DEALLOCATE TablesList
Note: Replace 'DBStackExchange' with your Database name
declare #T table (T_Name nvarchar(255), M datetime)
declare #T_Name nvarchar(255), #SQLT nvarchar(max)
declare c cursor for select name from sys.tables
open c
fetch next from c into #T_Name
while ##fetch_status = 0 begin
set #SQLT = 'select top 1 ''' + #T_Name + ''', Modified_Dt from ' + #T_Name + ' order by Modified_Dt desc'
insert #T
exec sp_executesql #SQLT
fetch next from c into #T_Name
end
close c
deallocate c
select * from #T where M >= dateadd(day,datediff(day,0,getdate()),0)
Here is an answer without cursor or temporary table
DECLARE #ColumnName AS nvarchar(40) = 'Modified_Dt';
DECLARE #ModifiedSince AS datetime = '20140709';
DECLARE #sql AS nvarchar(max) = '';
-- Build a query with UNION ALL between all tables containing #ColumnName
WITH AllTables AS (
SELECT SCHEMA_NAME(Tables.schema_id) AS SchemaName
,Tables.name AS TableName
,Columns.name AS ColumnName
FROM sys.tables AS Tables
INNER JOIN sys.columns AS Columns
ON Tables.object_id = Columns.object_id
WHERE Columns.name = #ColumnName
)
SELECT #sql = #sql +
'UNION ALL SELECT ' + QUOTENAME(TableName, '''') +
', ' + QUOTENAME(ColumnName) +
' FROM ' + QUOTENAME(TableName) + CHAR(13)
FROM AllTables;
-- Create a query which selects last change from all tables
SET #sql =
'WITH AllChanges(TableName, ModifiedTime) AS ( ' +
STUFF(#sql, 1, LEN('UNION ALL'), '') + -- Remove first UNION
') ' +
'SELECT TableName ' +
' ,MAX(ModifiedTime) ' +
'FROM AllChanges ' +
'WHERE ModifiedTime > #ModifiedSince '
'GROUP BY TableName '
EXECUTE sp_executesql #sql, N'#ModifiedSince datetime', #ModifiedSince
I've got table with columns and procedure to create SQL table:
DECLARE #SQLString NVARCHAR(MAX)
SELECT #SQLString =
'
'+ ColName + ' ' + ColType + ' '+ ColNullable + ',
'
FROM FS_Report_Tables WHERE TableId = 0
PRINT ('CREATE TABLE '+ 'Test' + #SQLString)
EXEC ('CREATE TABLE '+ 'Test' + #SQLString)
Current code prints only last column when I need all ( without coma at last )
Data table example:
ColumnId TableId ColName ColType ColNullable
1 0 A int NOT NULL
2 0 B int NOT NULL
How can I build SQLString with nodes from SELECT from another table?
Please try:
DECLARE #SQLString NVARCHAR(MAX)
SELECT
#SQLString = COALESCE(#SQLString + ', ', '') + ColName + ' ' + ColType + ' ' + ColNullable
from
YourTable
select #SQLString
EXEC ('CREATE TABLE YourTableName (' + #SQLString + ')')
DECLARE #SQLString NVARCHAR(MAX)
SET #SQLString = 'CREATE TABLE '+ #TableName +
'
( '+#Column1Name+' '+#Column1DataType +' '+#Column1Nullable +')
'
PREPARE stmt FROM #SQLString;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
You need to use prepared statements
SQL server provides you a stored procedure, sp_executesql which will do this task for you