SET IDENTITY_INSERT table1 ON
This command is giving me error and I need to insert a value into identity column in Postgresql.
Related
I can't figure out what I am doing wrong.
This is my code
SET IDENTITY_INSERT [Erea_Local].[Domain].[BlikAfmeting] ON
INSERT INTO [Erea_Local].[Domain].[BlikAfmeting]
SELECT *
FROM [dbo].[BlikAfmetings]
SET IDENTITY_INSERT [Erea_Local].[Domain].[BlikAfmeting] OFF
This is the error
An explicit value for the identity column in table 'Erea_Local.Domain.BlikAfmeting' can only be specified when a column list is used and IDENTITY_INSERT is ON.
If I only run the set IDENTITY INSERT .....
I get the message command completed
According the message:
An explicit value for the identity column in table
'Erea_Local.Domain.BlikAfmeting' can only be specified when a column
list is used and IDENTITY_INSERT is ON.
You should use a column list of values.
I have a table which has several field including:
contact_id
phone
phone_id
contact_id and phone are primary keys and phone_id is an auto increment field. I want to use it to recognize a certain entry. So I want to know that is it possible to duplicate that non primary field when I'm entering data.
Unless there is no constraint, some unique index, you can duplicate values in that column, because 1) you can turn identity_insert on, 2) you can reseed increments.
Here is a proof:
CREATE TABLE #test(id INT IDENTITY(1, 1))
INSERT INTO #test DEFAULT VALUES
INSERT INTO #test DEFAULT VALUES
INSERT INTO #test DEFAULT VALUES
SET IDENTITY_INSERT #test ON
INSERT INTO #test(id) VALUES(1)
SET IDENTITY_INSERT #test OFF
INSERT INTO #test DEFAULT VALUES
INSERT INTO #test DEFAULT VALUES
DBCC CHECKIDENT ('#test', RESEED, 1);
INSERT INTO #test DEFAULT VALUES
INSERT INTO #test DEFAULT VALUES
SELECT * FROM #test
DROP TABLE #test
Output:
id
1
2
3
1
4
5
2
3
The short answer is Yes, it's possible.
SQL Server does not force a unique constraint on identity columns, meaning that the can have duplicated values, however, Sql server will not generate duplicate values itself in an identity column.
Identity columns in sql server are populated by the sql server itself when you insert a row to the table.
However, you can specify a value to them by using SET IDENTITY_INSERT before the insert statement.
There are a couple of things that you should be aware of:
Setting identity_insert on is per table. you can only set it for one table at the time.
Until you set the identity_insert back off, any insert statement to that table will have to specify a value for the identity column.
you can't use set identity insert on for more then one table on a single session. therefor after you've done inserting records to the table you must set the identity_insert back off on that table.
I'm trying to overcome the problem of identity gaps in my table that occur when i delete rows, where the SQL Server management studio increments not the last identity that exists in the table but the last created row identity even if it was deleted.
I'm not sure how to do this in a trigger:
1- When a row is being inserted
2- Get the last identity that exists in the table
3- Increment that identity by 1
4- Set the identity of the row being inserted to the new identity in (3-)
5- Perform the insert
You can use DBCC CHECKIDENT to reset the identity to max identity value in the table
Checks the current identity value for the specified table
and, if it is needed, changes the identity value. You can
also use DBCC CHECKIDENT to manually set a new current identity value
for the identity column.
Simple Demo
CREATE TABLE trgtest
(
id INT IDENTITY(1, 1),
NAME VARCHAR(30)
)
INSERT INTO trgtest
VALUES ('A'),('B'),('C'),('D')
SELECT * FROM trgtest
DELETE FROM trgtest
WHERE NAME = 'D'
DECLARE #max_id INT
SELECT #max_id = Max(id)
FROM trgtest
DBCC checkident(trgtest, reseed, #max_id) -- Reseting the Identity value to Max identity value in Table
INSERT INTO trgtest
VALUES ('D')
SELECT * FROM trgtest
Q 1:
I have a empty table to insert records. Having one column of IDENTITY type, for which I want to insert values manually.
Example:
Table: Employee
create table Employee
(
ID int IDENTITY(1,1) PRIMARY KEY,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Address varchar(255),
City varchar(255)
)
Inserting records:
SET IDENTITY_INSERT Employee ON;
insert into Employee values(101,'ABC','XYZ','HighStreet','Moscow')
Error:
Msg 8101, Level 16, State 1, Line 1
An explicit value for the identity column in table 'Employee' can only be specified when a column list is used and IDENTITY_INSERT is ON.
Q 2:
How to get latest inserted ID of an Employee without using MAX and Top?
Answer 1
If you will try to insert the value into Identity column you will get the error
Cannot insert explicit value for identity column in table ‘Employee’
when IDENTITY_INSERT is set to OFF.
Write SET IDENTITY_INSERT table name ON before the insert script and
SET IDENTITY_INSERT table name Off after insert script
SET IDENTITY_INSERT Employee ON
insert into Employee(ID,LastName,FirstName,Address,City) values
(101,'ABC','XYZ','HighStreet','Moscow')
SET IDENTITY_INSERT Employee OFF
Answer 2
There are several ways using like this after insert statement
After an INSERT, SELECT INTO, or bulk copy statement is completed,
##IDENTITY contains the last identity value that is generated by the
statement
SELECT ##IDENTITY
It returns the last IDENTITY value produced on a connection,
regardless of the table that produced the value, and regardless of the
scope of the statement that produced the value.
SELECT SCOPE_IDENTITY()
It returns the last IDENTITY value produced on a connection and by a
statement in the same scope, regardless of the table that produced the
value.
SELECT IDENT_CURRENT(‘Employee’)
It returns the last IDENTITY value produced in a table, regardless of
the connection that created the value, and regardless of the scope of
the statement that produced the value. IDENT_CURRENT is not limited by
scope and session; it is limited to a specified table. IDENT_CURRENT
returns the identity value generated for a specific table in any
session and any scope.
MSDN SOURCE
You can use IDENT_CURRENT( 'table_name' ) to get the current value.
For external value of Identity column Column Name given explicitly is Must as below
SET IDENTITY_INSERT Employee ON;
insert into Employee(ID ,LastName,FirstName,Address,City)
values(101,'ABC','XYZ','HighStreet','Moscow')
don't know why this code is not executing...
SET IDENTITY_INSERT COM_MST ON
GO
INSERT INTO COM_MST
SELECT * FROM COM_MST_DEL
and showing an error
An explicit value for the identity column in table 'COM_MST' can only be specified when a column list is used and IDENTITY_INSERT is ON.
You have to specify the columns in the insert statement
SET IDENTITY_INSERT COM_MST ON
GO
INSERT INTO COM_MST
SELECT * FROM COM_MST_DEL
In this your select statement SELECT * FROM COM_MST_DEL might be returning more than the column available in table COM_MST also make sure to specify the column name in Insert statement.
OR
See the solution proposed in the post An explicit value for the identity column in table can only be specified when a column list is used and IDENTITY_INSERT is ON SQL Server