hibbins.com » TSQL

TSQL Date Only Function

Jon Hibbins — Tue, 24 Nov 2009 07:00:38 +0000

CREATE FUNCTION [dbo].[DateOnly] (@DATE DATETIME)
RETURNS DATETIME
BEGIN
    RETURN DATEADD(d, DATEDIFF(d, 0, @DATE), 0)
END

TSQL Last Day Of The Month

Jon Hibbins — Mon, 23 Nov 2009 11:43:45 +0000

CREATE FUNCTION [dbo].[LastDayOfTheMonth] (@DATE DATETIME )
RETURNS DATETIME
BEGIN
    RETURN dateadd(ms, -3, DATEADD(mm, DATEDIFF(m, 0, @DATE) + 1, 0))
END

SQL Server Schema,Table,Function and Stored procedure Auditing

Jon Hibbins — Wed, 17 Dec 2008 16:09:47 +0000

If you like to know what’s changing on your SQL Server then the following code creates an audit table and the associated trigger for logging the changes

The Audit Object Table

CREATE TABLE [dbo].[AuditObjects](
 [EventID] [INT] IDENTITY(1,1) NOT NULL
,[EventData] [xml] NULL
PRIMARY KEY CLUSTERED (
   [EventID] ASC
) WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

And the associated Trigger

CREATE TRIGGER [TriggerAuditObjects]
ON DATABASE
FOR DDL_DATABASE_LEVEL_EVENTS
AS
INSERT INTO [dbo].[AuditObjects](EventData)
SELECT EVENTDATA()
GO
ENABLE TRIGGER [TriggerAuditObjects] ON DATABASE

You can now use xpath queries to analyse the data

Search Stored Procedures

Jon Hibbins — Fri, 05 Dec 2008 09:21:50 +0000

Ever had the need to search stored procedures to find redundant tables or text that needs replacing or re-factoring ?

Here’s a script to help (Sorry for the cursor, I’m sad with myself for using it )

-- Search string
DECLARE @SearchString nvarchar(50)
SET @SearchString = 'Search String'
 
-- Required Declares
DECLARE @getdbname sysname
DECLARE @sqlstm nvarchar(1000)
DECLARE SeachCursor cursor FOR 
-- Get All The Names into the SeachCursor
SELECT '['+name+']' FROM [master].[dbo].[sysdatabases] ORDER BY name 
OPEN SeachCursor
-- Add the Search Pattern
SET @SearchString = '%' + @SearchString + '%'
--Get the first Name
FETCH NEXT FROM SeachCursor INTO @getdbname
WHILE @@FETCH_STATUS=0
	BEGIN
	--set the statement to define the search condition, with variables
	SET @sqlstm = '
	SELECT [SP].[Specific_Catalog] AS [Database_Name], [SP].[Routine_Name] AS [Stored Procedure Name],[SP].[Routine_Definition] AS [Routine_Definition]
	FROM '+ @getdbname+'.[Information_Schema].[Routines] AS [SP]
	WHERE PatIndex('+''''+@SearchString+''''+', [Routine_Definition]) > 0'
	--Execute the Query
	EXEC (@sqlstm)
	FETCH NEXT FROM SeachCursor INTO @getdbname
	END
--Close the Cursor and Deallocate it from memory
CLOSE SeachCursor
DEALLOCATE SeachCursor

SQL 2008 Enable Changes To Tables

Jon Hibbins — Wed, 08 Oct 2008 13:23:34 +0000

If you get the error in the SQL 2008 Management Studio :

“Saving changes is not permitted. The changes you have made require the following tables to be dropped and re-created. You have either made changes to a table that can’t be re-created or enabled the option Prevent saving changes that require the table to be re-created.”

You can enable changes inside the Microsoft SQL Server Management Studio by going to ‘Tools|Options|Designers’ then unchecking the ‘Prevent saving changes that require table re-creation’ option

TSQL Count Number Of Stored Procedures, Views, Tables or Functions

Jon Hibbins — Thu, 04 Sep 2008 10:19:53 +0000

You can use TSQL to Count Number Of Stored Procedures, Views, Tables or Functions in a Database by using the Database INFORMATION_SCHEMA view

/* Count Number Of Tables In A Database */
    SELECT COUNT(*) AS TABLE_COUNT FROM INFORMATION_SCHEMA.TABLES
    WHERE TABLE_TYPE='BASE TABLE'
    /* Count Number Of Views In A Database */
    SELECT COUNT(*) AS VIEW_COUNT FROM INFORMATION_SCHEMA.VIEWS
    /* Count Number Of Stored Procedures In A Database */
    SELECT COUNT(*) AS PROCEDURE_COUNT FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 'PROCEDURE'
    /* Count Number Of Functions In A Database */
    SELECT COUNT(*) AS FUNCTION_COUNT FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 'FUNCTION'

The same methodology can be used to query for information :

/* Select Table Information For A Database */
    SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='BASE TABLE'
    /* Select View Information For A Database */
    SELECT * FROM INFORMATION_SCHEMA.VIEWS
    /* Select Stored Procedure Information For A Database */
    SELECT * FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 'PROCEDURE'
    /* Select Function Information For A Database */
    SELECT * FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 'FUNCTION'

SQL Server – TSQL DISTINCT or GROUP BY?

Jon Hibbins — Wed, 03 Sep 2008 10:47:46 +0000

DISTINCT v GROUP BY

A DISTINCT and GROUP BY usually generate the same query plan, so performance should be very simular or the same, if you only need to remove the dulicates then DISTINCT is easier to understand in the query, if you have a more complex query it may be worth running both and studdying the execution plan to see if your specific example wins

Take a MSSQL database offline and back online with TSQL

Jon Hibbins — Tue, 05 Aug 2008 06:29:29 +0000

Take a database offline with TSQL:

– Kill All Other Users Processes And Set The Database To Single User Mode
ALTER DATABASE AdventureWorks
SET SINGLE_USER
WITH ROLLBACK IMMEDIATE
– Take Offline
EXEC sp_dboption ‘AdventureWorks’, ‘offline’, ‘TRUE’

And restoring the database back to online with TSQL:

– Allow Users Back In By Setting Multi User Mode On
ALTER DATABASE AdventureWorks SET MULTI_USER
– Bring Back Online
EXEC sp_dboption ‘AdventureWorks’, ‘offline’, ‘FALSE’

Check if a SQL Server database exists or not (TSQL)

Jon Hibbins — Fri, 01 Aug 2008 11:29:15 +0000

Here is a usefull TSQL Script for checking if a database exists :

– Check if the Database Exists
DECLARE @DatabaseCount AS int
SELECT @DatabaseCount=COUNT(*) FROM master.dbo.sysdatabases WHERE name=‘master’
SELECT @DatabaseCount AS [DatabaseCount]