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When you try to insert into a table with an identity column, you may receive an error message indicating that an explicit value cannot be inserted for an identity column in table “Table” when IDENTITY_INSERT is OFF. “This is not the end of the world and it is actually quite easy to get around.
The reason for this error is when you are trying to tell SQL Server what the identifier value for a row in a table should be. If your table has an ID column, SQL Server wants to automatically generate that ID value for you. The error is basically “Hey, I have to generate an ID for you … don’t tell me what it is!”
Only one table in a session can have IDENTITY_INSERT ON at any given time. If this property is already enabled for a table and SET IDENTITY_INSERT ON is issued for another table, SQL Server returns an error message indicating that SET IDENTITY_INSERT is already enabled and reports the table set to ON.
If the inserted value is greater than the current identifier value for the table, SQL Server automatically uses the newly inserted value as the current identifier value.
SET IDENTITY_INSERT is specified at runtime or at runtime, not during scan.
Creating databases and tables
First, create a named database.
Create a table named “Person” using the following code. Table created using “PRIMARY KEY IDENTITY”
Syntax for setting “identity_insert off | of course”
“Set identity_insert off | on” helps us fix this error. The correct syntax for this statement is as follows.
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SET IDENTITY_INSERT . . {OFF | SURE }
Whereas the first argument is the name of the database in which the table is located. The second argument specifying is the schema to which this table belongs, whose ID value should be set to ON or OFF. The third argument is a table with an identity column.
There are two main ways to insert data into a table without error. They are considered a solution to this error and are described below.
Tell SQL Server what the identifier value should be
If you want to specify ID values for the records you are inserting, you must run a small SQL command to enable ID insertion before running the INSERT statement. Identity inserts allow you to populate the value of an identity column with a specific value.
Allow SQL Server to generate ID
If you don’t care about the identity values for these records, you should let SQL Server only generate the identity values for you. To do this, simply enter the table columns and omit the identity column.
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