Delete All Data in SQL Server Database

Delete all data in SQL Server database

SQLMenace's solution worked for me with a slight tweak to how data is deleted - DELETE FROM instead of TRUNCATE.

-- disable referential integrity
EXEC sp_MSForEachTable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL' 
GO 

EXEC sp_MSForEachTable 'DELETE FROM ?' 
GO 

-- enable referential integrity again 
EXEC sp_MSForEachTable 'ALTER TABLE ? WITH CHECK CHECK CONSTRAINT ALL' 
GO

How to delete the contents of a database in SQL Server Management Studio?

Try:

step1> generate Script of the database and save it in file(.sql)(without data)

step2> delete current database

step3> run the script(.sql) in Sql Server Management Studio

now you'll get the blank database.

see Generate a Script (SQL Server Management Studio)

delete all from table

You can use the below query to remove all the rows from the table, also you should keep it in mind that it will reset the Identity too.

TRUNCATE TABLE table_name

How to delete large data of table in SQL without log?

1. If you are Deleting All the rows in that table the simplest option is to Truncate table, something like

    TRUNCATE TABLE LargeTable
    GO
   

Truncate table will simply empty the table, you cannot use WHERE clause to limit the rows being deleted and no triggers will be fired.

2. On the other hand if you are deleting more than 80-90 Percent of the data, say if you have total of 11 million rows and you want to delete 10 million another way would be to Insert these 1 million rows (records you want to keep) to another staging table. Truncate this large table and Insert back these 1 million rows.

3. Or if permissions/views or other objects which has this large table as their underlying table doesn't get affected by dropping this table, you can get these relatively small amounts of the rows into another table, drop this table and create another table with same schema, and import these rows back into this ex-Large table.

4. One last option I can think of is to change your database's Recovery Mode to SIMPLE and then delete rows in smaller batches using a while loop something like this:

    DECLARE @Deleted_Rows INT;
    SET @Deleted_Rows = 1;
   
    WHILE (@Deleted_Rows > 0)
      BEGIN
       -- Delete some small number of rows at a time
         DELETE TOP (10000)  LargeTable 
         WHERE readTime < dateadd(MONTH,-7,GETDATE())
   
      SET @Deleted_Rows = @@ROWCOUNT;
    END
   

and don't forget to change the Recovery mode back to full and I think you have to take a backup to make it fully effective (the change or recovery modes).

How to drop all tables in a SQL Server database?

It doesn't work for me either when there are multiple foreign key tables.

I found that code that works and does everything you try (delete all tables from your database):

DECLARE @Sql NVARCHAR(500) DECLARE @Cursor CURSOR

SET @Cursor = CURSOR FAST_FORWARD FOR
SELECT DISTINCT sql = 'ALTER TABLE [' + tc2.TABLE_SCHEMA + '].[' +  tc2.TABLE_NAME + '] DROP [' + rc1.CONSTRAINT_NAME + '];'
FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS rc1
LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc2 ON tc2.CONSTRAINT_NAME =rc1.CONSTRAINT_NAME

OPEN @Cursor FETCH NEXT FROM @Cursor INTO @Sql

WHILE (@@FETCH_STATUS = 0)
BEGIN
Exec sp_executesql @Sql
FETCH NEXT FROM @Cursor INTO @Sql
END

CLOSE @Cursor DEALLOCATE @Cursor
GO

EXEC sp_MSforeachtable 'DROP TABLE ?'
GO

You can find the post here. It is the post by Groker.

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