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Asked: 2026-05-11T10:04:17+00:00

I’ve created some foreign keys without an explicit name. Then I’ve found SQL generated

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I’ve created some foreign keys without an explicit name.

Then I’ve found SQL generated crazy names like FK__Machines__IdArt__760D22A7. Guess they will be generated with different names at different servers.

Is there any nice function to drop the unnamed FK constraints passing as arguments the tables and the fields in question?

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  1. There is not a built in procedure to accomplish this, but you can build your own using the information in the information_schema views.

    Table based example

    Create Proc dropFK(@TableName sysname) as Begin  Declare @FK sysname Declare @SQL nvarchar(4000) Declare crsFK cursor for  select tu.Constraint_Name from  information_schema.constraint_table_usage TU LEFT JOIN SYSOBJECTS SO  ON TU.Constraint_NAME = SO.NAME where xtype = 'F' and Table_Name = @TableName open crsFK fetch next from crsFK into @FK While (@@Fetch_Status = 0) Begin     Set @SQL = 'Alter table ' + @TableName + ' Drop Constraint ' + @FK     Print 'Dropping ' + @FK     exec sp_executesql  @SQL     fetch next from crsFK into @FK End Close crsFK Deallocate crsFK End
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