How to get identity for primary key in sql

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3.67/5 (3 votes)

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Hi all,

I have a table as emp(empid primary key,identity,sal,dept).
I inserted 10 values like

empid  sal dept

1     2000  3
2     3000  2
3     500   1
.     ...   .
.     ...   .
.     ...   .
10    2000  3

Now I deleted empid from 5 to 10.

Now I am inserting new values it's empid takes from 11.....
but here will need to takes empid id as 6........

How can I over come this .........please any body help to me
Thanks in advance..........

Posted 30-May-12 23:51pm

Unareshraju

Updated 31-May-12 0:06am

v3

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Comments

Arunprasath Natarajan 31-May-12 6:12am

If ID is Auto generated you can not get the deleted ID.

4 solutions

Solution 4

Hi You cannot get deleted id. because ur primary key will be auto generated.

if you want to insert record with deleted id then you have to

SQL

SET IDENTITY_INSERT OFF
insert into emp(empid primary key,identity,sal,dept) values (6, your values).
SET IDENTITY_INSERT ON

Posted 31-May-12 0:59am

sunandandutt

Updated 31-May-12 1:00am

v2

Solution 2

Hi,

Try read this article:

[SQL-How-to-find-holes-in-sequences]

Using the last sql to get the first free number and then use this number in the insert query. Remember to use the IDENTITY_INSERT when inserting values into an identity column.

Regards
Joachim

Posted 31-May-12 0:30am

Joachim1234

Solution 3

Hi u cannot get deleted id. because ur primary key will be auto generated.

if u remove auto generated and identty is yes to no u will get it.

Posted 31-May-12 0:50am

MAKReddy

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Ashok Nalam · Accepted Answer · 2012-05-31T00:18:00

If SET IDENTITY_INSERT is ON then if you try to delete the middle rows data and again if you try to add the new row it will take max(id)+1 for the new row not the middle rows values.

Inorder to insert middle rows manually you have to do it with by setting SET IDENTITY_INSERT to off.

SET IDENTITY_INSERT OFF
insert into emp(empid primary key,identity,sal,dept) values (6, your values).

then again try to on the IDENTITY_INSERT. then it will continue with taking id as
max(id)+1.

SET IDENTITY_INSERT ON

<pre lang="SQL">
SET IDENTITY_INSERT OFF
insert into emp(empid primary key,identity,sal,dept) values (6, your values).
SET IDENTITY_INSERT ON