Question

In SQL Server Management Studio, I did the query below.
Unfortunately, I forgot to uncomment the WHERE clause.
1647 rows were updated instead of 4.

How can I undo the last statement?

Unfortunately, I’ve only just finished translating those 1647 rows and was doing final corrections , and thus don’t have a backup.

UPDATE [dbo].[T_Language]
   SET 
       [LANG_DE] = 'Mietvertrag' --<LANG_DE, varchar(255),>
      ,[LANG_FR] = 'Contrat de bail' -- <LANG_FR, varchar(255),>
      ,[LANG_IT] = 'Contratto di locazione' -- <LANG_IT, varchar(255),>      
      ,[LANG_EN] = 'Tenancy agreement' -- <LANG_EN, varchar(255),>
       --WHERE [LANG_DE] like 'Mietvertrag'

There is a transaction protocol, at least I hope so.

Answer 1

A non-committed transaction can be reverted by issuing the command ROLLBACK

But if you are running in auto-commit mode there is nothing you can do….