SQL Drop Primary Key
Hi
I am trying to drop a primary key in my SQL table [Machines]. The following isn't working
ALTER TABLE Machines DROP CONSTRAINT pk_Machine_Number
This is strange because with SELECT column_name FROM INFORMATION_SCHEMA.KEY_COL
I can see "Machine Number" so I am not sure what I am doing wrong
I am trying to drop a primary key in my SQL table [Machines]. The following isn't working
ALTER TABLE Machines DROP CONSTRAINT pk_Machine_Number
This is strange because with SELECT column_name FROM INFORMATION_SCHEMA.KEY_COL
I can see "Machine Number" so I am not sure what I am doing wrong
Use this query to verify if that constraint really exists:
SELECT name
FROM sys.key_constraints
WHERE type = 'PK' AND OBJECT_NAME(parent_object_id) = N'Machines'; 
What does "not work" means? What error message do you get?
btw, you cannot drop a PRIMARY KEY or UNIQUE constraint, when it's part of a FOREIGN KEY relation or when the table has a XML or spatial index.
btw, you cannot drop a PRIMARY KEY or UNIQUE constraint, when it's part of a FOREIGN KEY relation or when the table has a XML or spatial index.
ASKER
Hi Vitor. When I run your SQL I get PK__Machines__0687CEB62221
Would that last bit have been added on automatically
Would that last bit have been added on automatically
ASKER CERTIFIED SOLUTION
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ASKER
so this worked ALTER TABLE Machines DROP CONSTRAINT PK__Machines__0687CEB62221
ASKER
Great. Thanks once again! Excellent answer
try this, try to right click the table, and then select Script Table as > CREATE To > New Query Editor Window, see what's the CONSTRAINT name there?