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How do you change the datatype of a primary key in a column?
You can’t change primary key column,unless you drop it.. Any operations to change its data type will lead to below error.. The object ‘XXXX’ is dependent on column ‘XXXX’.
How can I change the datatype of a primary key in SQL Server?
To modify a primary key
- Open the Table Designer for the table whose primary key you want to modify, right-click in the Table Designer, and choose Indexes/Keys from the shortcut menu.
- In the Indexes/Keys dialog box, select the primary key index from the Selected Primary/Unique Key or Index list.
Can we update primary key column in SQL?
A table’s primary key should be explicitly defined in the CREATE TABLE statement. Tables can only have one primary key. You can change the primary key of an existing table with an ALTER TABLE ALTER PRIMARY KEY statement, or by using DROP CONSTRAINT and then ADD CONSTRAINT in the same transaction.
Is it OK to use varchar for primary key value?
Varchar takes up more space than integers, and there is more processing required to work with character data. Then again, database design should not be determined from performance alone. If the product ids are non-numeric, it could be alright to use it.
How to change the column length of a primary key?
The object ‘PK_TableName’ is dependent on column ‘PersonID’. PersonID = PK. I’ve read What is the sql to change the field length of a table column in sql server which only applies to non-PK columns.
How to change the primary key in SQL?
SQLServer 2008 did not allow me to change a primary key with data so I deactivated all the constraints, performed the command and activated all the constraints again. The commands are: EXEC sp_MSforeachtable @command1=”ALTER TABLE ? NOCHECK CONSTRAINT ALL” — commands here EXEC sp_MSforeachtable @command1=”ALTER TABLE ? CHECK CONSTRAINT ALL”
Which is worse A varchar or an int?
VARCHAR vs. INT doesn’t tell much. What matter is the access pattern. On absolute terms, a wider key will always be worse than a narrow key. The type carries absolutely no importance, is the width that matters.