SQL Server - Truncate all tables

example_output.sql

-- COMING SOON

truncate_all_tables.sql

-----------------------------------------------------------------------------
-- 
-- Creates a SQL command to truncate all the required tables.
-- It removes all constraints, truncate the tables and add the same constraints again.
-- 
-- Based on (with a lot of fixes to work with different schemas and other issues):
-- http://sqlhints.com/2014/09/28/truncate-allall-except-fewspecified-tables-of-a-database-in-sql-server/
--
-----------------------------------------------------------------------------

USE [Cpr_Medical_E73]
GO
SET NOCOUNT ON
GO
--Get the list of all the tables to be truncated
 DECLARE @TablesToBeTruncated AS TABLE (
	Id INT IDENTITY(1,1),
	TableObjectId INT,
	TableName SYSNAME,
    SchemaId INT
)
INSERT INTO @TablesToBeTruncated (TableObjectId, TableName, SchemaId)
SELECT
	ST.object_id,
	ST.name,
	ST.schema_id
FROM
	sys.Tables ST
	INNER JOIN sys.Schemas SS
		ON ST.schema_id = SS.schema_id
WHERE ST.type = 'U' AND ST.NAME NOT LIKE '#%' AND ST.name <> 'sysdiagrams'
	--AND SS.name IN ('') -- Specify here the comma separated schema names which tables need to be truncated
	--AND ST.NAME NOT IN ('') -- Specify here the comma separated table names which needs to be truncated
	--AND ST.NAME IN ('') -- Specify here the comma separated table names for which truncation is not required

PRINT 'BEGIN TRANSACTION TruncateTables'
PRINT 'BEGIN TRY'

DECLARE @DbName VARCHAR(MAX)
SELECT @DbName = db_name();
PRINT '    USE [' + @DbName + ']'

--Generate the foreignkeys drop and create back script 
DECLARE
	@CreateScript AS NVARCHAR(MAX),
	@DropScript AS NVARCHAR(MAX)

SELECT
    ------------DROP SCRIPT--------------------
    @DropScript = ISNULL(@DropScript,'') +
		'    ALTER TABLE ' + QUOTENAME(SCHEMA_NAME(FKey.schema_id)) + '.' + QUOTENAME(OBJECT_NAME(FKey.parent_object_id)) +
		' DROP CONSTRAINT ' + QUOTENAME(FKey.name) + CHAR(10),

     -----------CREATE BACK SCRIPT-------------
    @CreateScript = ISNULL(@CreateScript,'') +
		'    ALTER TABLE ' + QUOTENAME(SCHEMA_NAME(FKey.schema_id)) + '.' + QUOTENAME(OBJECT_NAME(FKey.parent_object_id)) +
		' ADD CONSTRAINT ' + QUOTENAME(FKey.name) +
		' FOREIGN KEY ' +
			'(' + STUFF(( -- Get the list of columns
                 SELECT ',' + QUOTENAME(COL_NAME(FKeyCol.parent_object_id, FKeyCol.parent_column_id))
                 FROM SYS.FOREIGN_KEY_COLUMNS FKeyCol
                 WHERE FKey.OBJECT_ID = FKeyCol.constraint_object_id
                 ORDER BY FKeyCol.constraint_column_id
                 FOR XML PATH('')),1,1,'') +
			')' +
		' REFERENCES ' + QUOTENAME(SCHEMA_NAME(Tlist.SchemaId)) + '.' + QUOTENAME(OBJECT_NAME(FKey.referenced_object_id)) +
			' (' + STUFF(( -- Get the list of columns
                SELECT ',' + QUOTENAME(COL_NAME(FKeyCol.referenced_object_id, FKeyCol.referenced_column_id))
                FROM SYS.FOREIGN_KEY_COLUMNS FKeyCol
                WHERE FKey.OBJECT_ID = FKeyCol.constraint_object_id
                ORDER BY FKeyCol.constraint_column_id
                FOR XML PATH('')),1,1,'') +
			') ' +
		-- ON UPDATE ?
		CASE
			WHEN update_referential_action_desc = 'CASCADE' THEN ' ON UPDATE CASCADE'
            WHEN update_referential_action_desc = 'SET_DEFAULT' THEN ' ON UPDATE SET DEFAULT'
            WHEN update_referential_action_desc = 'SET_NULL' THEN ' ON UPDATE SET NULL'
            ELSE ''
		END +
		-- ON DELETE ?
		CASE
			WHEN delete_referential_action_desc = 'CASCADE' THEN ' ON DELETE CASCADE'
            WHEN delete_referential_action_desc = 'SET_DEFAULT' THEN ' ON DELETE SET DEFAULT'
            WHEN delete_referential_action_desc = 'SET_NULL' THEN ' ON DELETE SET NULL'
            ELSE ''
       END + CHAR(10)
 FROM
	@TablesToBeTruncated Tlist
    INNER JOIN SYS.FOREIGN_KEYS FKey
        ON Tlist.TableObjectId = FKey.referenced_object_id
 
--PRINT THE TRUNCATION SCRIPT
IF LEN(ISNULL(@DropScript,'')) > 0
 BEGIN
	PRINT CHAR(10) + CHAR(10) + '    --------DROP FOREIGN KEY CONSTRAINTS SCRIPT--------'
	PRINT CAST((@DropScript + CHAR(10) + CHAR(10)) AS NTEXT)
 END
 
PRINT '    --------TRUNCATE TABLES SCRIPT--------'
--TRUNCATE TABLES

DECLARE
	@id INT,
	@truncatescript NVARCHAR(MAX)

SELECT
	@id = MIN(Id)
FROM
	@TablesToBeTruncated

WHILE @id IS NOT NULL
 BEGIN
    SELECT
		@truncatescript = '    TRUNCATE TABLE ' + QUOTENAME(SCHEMA_NAME(SchemaId)) + '.' + QUOTENAME(TableName) 
    FROM
		@TablesToBeTruncated
	WHERE
		Id = @id

	PRINT CAST(@truncatescript AS NTEXT)

    SELECT
		@id = MIN(Id)
	FROM
		@TablesToBeTruncated
	WHERE Id > @id
 END
 
IF LEN(ISNULL(@CreateScript,'')) > 0
 BEGIN
	PRINT CHAR(10)
    PRINT '    --------CREATE BACK THE FOREIGN KEY CONSTRAINTS SCRIPT--------'
	PRINT CAST((@CreateScript + CHAR(10) + CHAR(10)) AS NTEXT)
 END

PRINT '    COMMIT TRANSACTION TruncateTables'
PRINT 'END TRY'

PRINT 'BEGIN CATCH'
PRINT '    ROLLBACK TRANSACTION TruncateTables'
PRINT 'END CATCH'

GO

Hi, you query is very useful, Is there a way to truncate all tables a database without the list of the tables?

Hi, you query is very useful, Is there a way to truncate all tables a database without the list of the tables?

you can use USE [Cpr_Medical_E73] select * from sys.tables and you get all names of tables