CoolInterview.com - World's Largest Collection of Interview Questions & Answers, FAQs, queries, sample papers, exam papers, dumps, what, why, how, where, when questions
Our Services
Get 9,000 Interview Questions & Answers in an eBook.




Get it now !!
Send your Resume to 6000 Companies

Search Interview Questions

Question: What is the difference between @@identity and SCOPE_IDENTITY()?

Answer: This particular issue isn't so much about doing something right or wrong, it is about understanding your options so you choose the right one. Both @@IDENTITY and SCOPE_IDENTITY() return the last identity value (primary key) that was entered by your active session, but in different scenarios they can each return different values. When I say "active session" I am referring to the current activity you are engaging in. For example, if you can a stored procedure, that is what I am referring to as your active session. Each call to t a stored procedure (or user defined function, etc) is a session, unless the a stored procedure is nested in the stored procedure you are calling. In the case of a nested stored procedure or user defined method, while they are separate methods, they are part of the current session, but not part of the current scope. Your scope is limited to the method (stored procedure or user defined function) that you explicitly invoked. This is where the difference between @@IDENTITY and SCOPE_IDENTITY() comes in.

@@IDENTITY will return the last identity value entered into a table in your current session (this is limited to your session only, so you won't get identities entered by other users). While @@IDENTITY is limited to the current session, it is not limited to the current scope. In other words, if you have a trigger on a table that causes an identity to be created in another table, you will get the identity that was created last, even if it was the trigger that created it. Now this isn't bad, as long as you ensure that things are done in the correct order. Where this can get ugly is when there is an application revision and a new trigger gets added that gets fired from your stored procedure. Your code didn't anticipate this new trigger, so you could now be getting an incorrect value back.

SCOPE_IDENTITY(), like @@IDENTITY, will return the last identity value created in the current session, but it will also limit it to your current scope as well. In other words, it will return the last identity value that you explicitly created, rather than any identity that was created by a trigger or a user defined function.

For more information and example refer to: -
1) http://dotnetjunkies.com/Article/86F0988E-FED4-414F-BA2E-D01D953C11BE.dcik
2) http://msdn2.microsoft.com/en-us/library/aa259185(sql.80).aspx
3) http://msdn2.microsoft.com/en-us/library/aa933167(SQL.80).aspx



Category SQL Interview Questions & Answers - Exam Mode / Learning Mode
Rating (0.2) By 7658 users
Added on 11/11/2012
Views 57139
Rate it!
Question: What is the difference between @@identity and SCOPE_IDENTITY()?
Answer:

This particular issue isn't so much about doing something right or wrong, it is about understanding your options so you choose the right one. Both @@IDENTITY and SCOPE_IDENTITY() return the last identity value (primary key) that was entered by your active session, but in different scenarios they can each return different values. When I say "active session" I am referring to the current activity you are engaging in. For example, if you can a stored procedure, that is what I am referring to as your active session. Each call to t a stored procedure (or user defined function, etc) is a session, unless the a stored procedure is nested in the stored procedure you are calling. In the case of a nested stored procedure or user defined method, while they are separate methods, they are part of the current session, but not part of the current scope. Your scope is limited to the method (stored procedure or user defined function) that you explicitly invoked. This is where the difference between @@IDENTITY and SCOPE_IDENTITY() comes in.

@@IDENTITY will return the last identity value entered into a table in your current session (this is limited to your session only, so you won't get identities entered by other users). While @@IDENTITY is limited to the current session, it is not limited to the current scope. In other words, if you have a trigger on a table that causes an identity to be created in another table, you will get the identity that was created last, even if it was the trigger that created it. Now this isn't bad, as long as you ensure that things are done in the correct order. Where this can get ugly is when there is an application revision and a new trigger gets added that gets fired from your stored procedure. Your code didn't anticipate this new trigger, so you could now be getting an incorrect value back.

SCOPE_IDENTITY(), like @@IDENTITY, will return the last identity value created in the current session, but it will also limit it to your current scope as well. In other words, it will return the last identity value that you explicitly created, rather than any identity that was created by a trigger or a user defined function.

For more information and example refer to: -
1) http://dotnetjunkies.com/Article/86F0988E-FED4-414F-BA2E-D01D953C11BE.dcik
2) http://msdn2.microsoft.com/en-us/library/aa259185(sql.80).aspx
3) http://msdn2.microsoft.com/en-us/library/aa933167(SQL.80).aspx Source: CoolInterview.com

Answered by: Anup | Date: 11/13/2007 | Contact Anup Contact Anup

SCOPE_IDENTITY, IDENT_CURRENT, and @@IDENTITY are similar functions in that they return values inserted into IDENTITY columns.

IDENT_CURRENT is not limited by scope and session; it is limited to a specified table. IDENT_CURRENT returns the value generated for a specific table in any session and any scope.

SCOPE_IDENTITY and @@IDENTITY will return last identity values generated in any table in the current session.

However, SCOPE_IDENTITY returns values inserted only within the current scope; @@IDENTITY is not limited to a specific scope
Source: CoolInterview.com

Answered by: Rajesh Jaiswal | Date: 9/22/2009 | Contact Rajesh Jaiswal Contact Rajesh Jaiswal


If you have the better answer, then send it to us. We will display your answer after the approval

Rules to Post Answers in CoolInterview.com:-

  • There should not be any Spelling Mistakes.
  • There should not be any Gramatical Errors.
  • Answers must not contain any bad words.
  • Answers should not be the repeat of same answer, already approved.
  • Answer should be complete in itself.

Post your answer here

Inform me about updated answers to this question.
Related Questions
View Answer
1. How to create a new table?
2. How to insert another column into the table?
View Answer
What is the use of indexes?Explain about it?
View Answer
lets i have a table "bapi" having 6 field like this
f1 f2 f3 f4 f5 f6
... ... .. ... ... ...
p r o m o d

i want to retrive all the data by using select statement and my output will be look like this:
xyz
...
p
r
o
m
o
d
f1 f2 f3 f4 f5 f6
... ... .. ... - SQL Interview Questions & Answers" class="btn btn-primary btn-xs">View Answer
what is the difference between replace and translate functions?
View Answer
How to delete same id in rows?
For example empid=5 repeated for times in rows. How to delete which sql query is used?
View Answer
Difference between decode and case.
in which case we are using case and in which case we are using decode?
with an example.

View Answer
How to retrieving the data from 11th column to n th column in a table.

View Answer
what is the difference between oracle,sql and sql server

View Answer
on index
why u need indexing ? where that is stroed
and what u mean by schema object?
for what purpose we are using view

View Answer
I have a table with duplicate names in it. Write me a query which returns only duplicate rows with number of times they are repeated.

View Answer
Difference between Stored Procedure and Trigger

View Answer
When using a count(disitnct) is it better to use a self-join or temp table to find redundant data, and provide an example?

View Answer
What is the advantage to use trigger in your PL?

View Answer
What the difference between UNION and UNIONALL?

View Answer
How to find second maximum value from a table?

View Answer
How to display duplicate rows in a table?

View Answer
What is joint?

View Answer
What is the difference between TRUNCATE and DELETE commands
View Answer
Which system table contains information on constraints on all the tables created?
View Answer
Which command displays the SQL command in the SQL buffer, and then executes it
View Answer

Please Note: We keep on updating better answers to this site. In case you are looking for Jobs, Pls Click Here Vyoms.com - Best Freshers & Experienced Jobs Website.

View All SQL Interview Questions & Answers - Exam Mode / Learning Mode




India News Network
Latest 20 Questions
Payment of time- barred debt is: (a) Valid (b) Void (c) Illegal (d) Voidable
Consideration is defined in the Indian Contract Act,1872 in: (a) Section 2(f) (b) Section 2(e) (c) Section 2(g) (d) Section 2(d)
Which of the following is not an exception to the rule, "No consideration, No contract": (a) Natural love and affection (b) Compensation for involuntary services (c) Completed gift (d) Agency
Consideration must move at the desire of: (a) The promisor (b) The promisee (c) The promisor or any other party (d) Both the promisor and the promisee
An offer which is open for acceptance over a period of time is: (a) Cross Offer (b) Counter Offer (c) Standing Offer (d) Implied Offer
Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
_________ amounts to rejection of the original offer. (a) Cross offer (b) Special offer (c) Standing offer (d) Counter offer
A advertises to sell his old car by advertising in a newspaper. This offer is caleed: (a) General Offer (b) Special Offer (c) Continuing Offer (d) None of the above
In case a counter offer is made, the original offer stands: (a) Rejected (b) Accepted automatically (c) Accepted subject to certain modifications and variations (d) None of the above
In case of unenforceable contract having some technical defect, parties (a) Can sue upon it (b) Cannot sue upon it (c) Should consider it to be illegal (d) None of the above
If entire specified goods is perished before entering into contract of sale, the contract is (a) Valid (b) Void (c) Voidable (d) Cancelled
______________ contracts are also caled contracts with executed consideration. (a) Unilateral (b) Completed (c) Bilateral (d) Executory
A offers B to supply books @ Rs 100 each but B accepts the same with condition of 10% discount. This is a case of (a) Counter Offer (b) Cross Offer (c) Specific Offer (d) General Offer
_____________ is a game of chance. (a) Conditional Contract (b) Contingent Contract (c) Wagering Contract (d) Quasi Contract
There is no binding contract in case of _______ as one's offer cannot be constructed as acceptance (a) Cross Offer (b) Standing Offer (c) Counter Offer (d) Special Offer
An offer is made with an intention to have negotiation from other party. This type of offer is: (a) Invitation to offer (b) Valid offer (c) Voidable (d) None of the above
When an offer is made to the world at large, it is ____________ offer. (a) Counter (b) Special (c) General (d) None of the above
Implied contract even if not in writing or express words is perfectly _______________ if all the conditions are satisfied:- (a) Void (b) Voidable (c) Valid (d) Illegal
A specific offer can be accepted by ___________. (a) Any person (b) Any friend to offeror (c) The person to whom it is made (d) Any friend of offeree
An agreement toput a fire on a person's car is a ______: (a) Legal (b) Voidable (c) Valid (d) Illegal
Cache = 0.328125 Seconds