Drop Foreign Key without knowing the name of the constraint?

Question

I have created one table using below command:

create table Table1(
    Id int Not Null 
        Foreign key 
        references Table2(Id)  
        on delet         


        

Answer 1

Expanding on the answers since I ran into some gotchas. Also, I had 2 foreign keys declared, so I added an optional key to keep, if it's null it'll just be ignored:

declare @name varchar(255),
     @table varchar(255) = 'mytable',
     @column varchar(255) = 'mykeycolumn',
     @validkey varchar(255) =  'mykeyIwanttokeep'

SELECT @name = CONSTRAINT_NAME
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE TABLE_NAME = @table
    AND COLUMN_NAME =  @column
    AND (CONSTRAINT_NAME != @validkey or @validkey is null)

declare @sql varchar(1023) = 'alter table ' + @table + ' drop ' + @name 

exec (@sql)