Oracle Alter Table Drop Primary Key

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I created new field inside the table I transfered the values into new field and deleted old one, problem solved!! Right now I am working as a SQL Server developer in TCS.

Given that it WAS an autoincrement in the prior definition of the table, it is quite likely that there exists some program that inserts into this table without providing an ID value because the ID column is autoincrement anyway. Use anonymous type syntax to specify arguments e. Schema name is optional, if no schema is specified then dbo is assumed.

SQL - Primary Key

Hello Folks, We also know some basics about the Primary Key. The Primary Key constraint uniquely identifies each record in a database table. Primary Keys must contain unique values. By default, Primary key creates a clustered index on the column on which they are defined. A Primary key column cannot contain NULL values. There are multiple ways of creating, altering and deleting Primary Key Constraint on a table: How to create a PK with a constrain name while creating a table? Incorrect syntax near the keyword 'Primary'. So the question is how to find that out? Well there are multiple ways again. I am very passionate about SQL Server. Please feel free to drop me any question online or offline, I will try to give you the best possible answer from my side. Right now I am working as a SQL Server developer in TCS. I have an experience of just 2. You both have given a very nice queries, and thanx for the great learning. Hi Prashant, its really not necessary to give the constraint name specially for Primary Key. But if want to give explicitly as a constraint you might have to add a constraint name.

A primary key column cannot have NULL values. Since in case of import, the two thiings happen separately, dropping the primary key now will NOT drop the index. A primary key can be defined in either a CREATE TABLE statement or an ALTER TABLE statement. To drop a constraints associated index, you must disable or drop the constraint itself. Hello Folks, We also know some basics about the Primary Key. So unfortunately no difference to the statement we used before.