Drop all Tables

I want to be able to drop all tables in a database.

I've found this.

USE [database]
EXEC sp_MSforeachtable @command1 = "DROP TABLE ?"

Just need to check that t will not delete any system tables ect.
aneilgAsked:
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Anthony PerkinsConnect With a Mentor Commented:
Instead of using sys.objects it is a lot easier to use sys.tables.  From SQL Server's BOL:
Returns a row for each table object, currently only with sys.objects.type = U.
It is also a good idea to include the schema in any query.  It may not always be dbo or you may not have permission to drop tables that are in the dbo schema.

And of course it should be pointed out that all these simple strategies rely on the fact that the table has no foreign key relationships.
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Kevin CrossConnect With a Mentor Chief Technology OfficerCommented:
If I remember correctly, sp_MSforeachtable excludes system tables; however, it always works best to test first.  I usually use PRINT command, or something I can audit.  In addition, you can add a filter with the @whereand parameter.  Hence, you can make sure only the tables you want match the filter.  For example, only user tables will get printed with this code.

sp_MSForEachTable
    @command1 = "PRINT '?'",
    @whereand = "AND uid = ANY (SELECT uid FROM sys.objects WHERE [type] = 'U')"
;

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dbaSQLConnect With a Mentor Commented:
I like mwvisa1's suggestion, because sp_MSForEachTable is very quick and easy, but it is also an undocumented proc. While there are many common uses for the undocumented procs, we should try to avoid them, if we can.

Here's another method that should work to remove your tables:

--DROP ALL TABLES
USE YourDatabaseName
GO
DECLARE @TableName VARCHAR(150)
DECLARE @SQL VARCHAR(300)
 
SELECT @TableName = (
      SELECT TOP 1 [name]
      FROM sys.objects
      WHERE [type] = 'U'
      AND [name] LIKE N'TableName%'
      ORDER BY [name] )
 
WHILE @TableName IS NOT NULL
BEGIN
    SELECT @SQL = 'DROP TABLE [dbo].[' + RTRIM(@TableName) +']'
    EXEC (@SQL)
    PRINT 'Dropped Table : ' + @TableName
    SELECT @TableName = (
      SELECT TOP 1 [name]
      FROM sys.objects
      WHERE [type] = 'U'
      AND [name] LIKE N'TableName%'  
      AND [name] > @TableName
      ORDER BY [name] )
END
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aneilgAuthor Commented:
Thanks I'll have a look at both.
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aneilgAuthor Commented:
dbaSQL not sure what your code is doing but it does not delete any table from my database.
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Kevin CrossChief Technology OfficerCommented:
aneilg, my code does not DROP anything because I wanted you to use PRINT to verify the filter was working the way you wanted first.  Once you are satisfied, change the code back to the DROP statement you had.
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aneilgAuthor Commented:
OK, Thanks.
You were right in being cautious with EXEC sp_MSforeachtable it drops the system tables unless specified.

Once again thanks.
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Kevin CrossChief Technology OfficerCommented:
You are most welcome!

Best regards and happy coding,

Kevin
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dbaSQLCommented:
my apologies, aneilg.  I will take a look and see where the problem is.
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dbaSQLCommented:
Corrected code is below.  It was just that I had left this tester line in there:

       AND [name] LIKE N'TableName%'

Had I used the PRINT command first, as mwvisa1 suggested, we would have seen that in the output.  Always very good to PRINT before EXEC.



--DROP ALL TABLES
USE YourDatabase
GO

DECLARE @TableName VARCHAR(150)
DECLARE @SQL VARCHAR(300)
 
SELECT @TableName = (
      SELECT TOP 1 [name]
      FROM sys.objects
      WHERE [type] = 'U'
      ORDER BY [name] )
 
WHILE @TableName IS NOT NULL
BEGIN
    SELECT @SQL = 'DROP TABLE [dbo].[' + RTRIM(@TableName) +']'
  --  PRINT @SQL
      EXEC (@SQL)
    PRINT 'Dropped Table : ' + @TableName
    SELECT @TableName = (
      SELECT TOP 1 [name]
      FROM sys.objects
      WHERE [type] = 'U'
      AND [name] > @TableName
      ORDER BY [name] )
END
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