SQL Server 2008 delete all tables under special schema

Question

Hello I would like to know is is possible to drop all tables in database what was created under custom schema for example DBO1...with one sql query or special script.

T

Answer 1

Building on @Kevo's answer, I added the following for dropping all foreign key constraints before deleting the tables. I've only tested on SQL2008 R2

select @Sql = COALESCE(@Sql,'') + 'ALTER TABLE %SCHEMA%.' + t.name + ' drop constraint ' + 
OBJECT_NAME(d.constraint_object_id)  + ';' + CHAR(13)
from sys.tables t 
    join sys.foreign_key_columns d on d.parent_object_id = t.object_id 
    inner join sys.schemas s on t.schema_id = s.schema_id
where s.name = @Schema
ORDER BY t.name;

Answer 2

Just in case it helps someone, I added this as a stored procedure to the master database to allow it to conveniently used on any db / schema.

It can be called like this:

EXEC master.dbo.dropTablesInSchema 'my_db', 'dbo

Stored procedure create script:

CREATE PROC [master].[dbo].[dropTablesInSchema]
    @db nvarchar(max),
    @schema nvarchar(max)
AS
BEGIN
    DECLARE @Tables TABLE (name nvarchar(max))
    INSERT INTO @Tables
    EXEC ('SELECT TABLE_NAME FROM [' + @db + '].INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = ''' + @schema + ''' and TABLE_TYPE =''BASE TABLE''')

    DECLARE @SqlStatement NVARCHAR(MAX)
    SELECT @SqlStatement = 
        COALESCE(@SqlStatement, N'') + N'DROP TABLE [' + @db + '].[' + @schema + '].' + QUOTENAME(NAME) + N';' + CHAR(13)
    FROM @Tables

    EXEC(@SqlStatement)

END

Answer 3

This will generate all the DROP TABLE and DROP VIEW with check exists.

DECLARE @SqlStatement NVARCHAR(MAX)

SELECT @SqlStatement = 
COALESCE(@SqlStatement, N'') + N'IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'''+'['+TABLE_SCHEMA+'].' + QUOTENAME(TABLE_NAME) +''' )' + CHAR(13)+
 '  DROP '+ TABLE_TYPE +' ['+TABLE_SCHEMA+'].' + QUOTENAME(TABLE_NAME) + N';' + CHAR(13)
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA in ('SCHEMA1','SCHEMA2','SCHEMA13' )
ORDER BY TABLE_SCHEMA   

PRINT  REPLACE(@SqlStatement,'DROP BASE TABLE ','DROP TABLE ') 
GO

Answer 4

I combined the answers from @raider33 and @Kevo to one solutions for direct execution.

DECLARE @SqlStatement NVARCHAR(MAX)
DECLARE @schema varchar(30) = 'SCHEMA_NAME';

select @SqlStatement = COALESCE(@SqlStatement,'') + 'ALTER TABLE '+@schema+'.' + t.name + ' drop constraint ' + 
OBJECT_NAME(d.constraint_object_id)  + ';' + CHAR(13) + CHAR(10)
from sys.tables t 
    join sys.foreign_key_columns d on d.parent_object_id = t.object_id 
    inner join sys.schemas s on t.schema_id = s.schema_id
where s.name = @schema
ORDER BY t.name;

SELECT @SqlStatement += 
    COALESCE(@SqlStatement, '') + 'DROP TABLE ' + @schema +'.'+ QUOTENAME(TABLE_NAME) + ';'  + CHAR(13) + CHAR(10)
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = @schema

EXECUTE sp_executesql @SqlStatement

Answer 5

Also building on @Kevo's answer, I added the following while loop for an issue I was having with TSQL Print statement. A message string can be up to 8,000 characters long. If greater than 8,000 the print statement will truncate any remaining characters.

DECLARE @SqlLength int
      , @SqlPosition int = 1
      , @printMaxLength int = 8000

SET @SqlLength = LEN(@Sql)

WHILE (@SqlLength) > @printMaxLength
BEGIN
    PRINT SUBSTRING(@Sql, @SqlPosition, @printMaxLength)
    SET @SqlLength = @SqlLength - @printMaxLength
    SET @SqlPosition = @SqlPosition + @printMaxLength
END
IF (@SqlLength) < @printMaxLength AND (@SqlLength) > 0
BEGIN
    PRINT SUBSTRING(@Sql, @SqlPosition, @printMaxLength)
END

Answer 6

Modification of acepted answer that works just copy pasted.

Change db to your database and set @dbSchema to your schema.

USE db -- CHANGE TO YOUR DB
GO

DECLARE @dbSchema NVARCHAR(200);
SET @dbSchema = 'dbo'  -- CHANGE TO YOUR SCHEMA

DECLARE @SqlStatement NVARCHAR(MAX)
SELECT @SqlStatement =
    COALESCE(@SqlStatement, N'') + N'DROP TABLE ' +'[' + @dbSchema +']' + '.' + QUOTENAME(TABLE_NAME) + N';' + CHAR(13)
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = @dbSchema and TABLE_TYPE = 'BASE TABLE'

EXEC sp_executesql @SqlStatement