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What is the difference between/ purpose of the @@IDENTITY, SCOPE_IDENTITY(), IDENT_CURRENT ?
Description:I want to know the differences between or purposes of each one of the @@IDENTITY, SCOPE_IDENTITY(), IDENT_CURRENT() .
To understand the main differences between @@identity, scope_identity() and ident_current(tablename), start with the purpose of each one of them which are as follows.
-The @@identity function returns the last identity created in the same session. -The scope_identity() function returns the last identity created in the same session and the same scope. -The ident_current(tablename) returns the last identity created for a specific table or view in any session.
In the above definitions the session is the database connection. The scope is the current query or the current stored procedure.
Now for further understanding on scope_identity() and the @@identity functions's differences ,Lets consider if you have a trigger on the table. If you have a query that inserts a record, causing the trigger to insert another record on an other table, the scope_identity() function will return the identity created by the query, while the @@identity function will return the identity created by the trigger.
Replied by: Junaid Aziz | Replied on: Jul 13, 2018
-The @@identity function returns the last identity created in the same session.
-The scope_identity() function returns the last identity created in the same session and the same scope.
-The ident_current(tablename) returns the last identity created for a specific table or view in any session.
In the above definitions the session is the database connection. The scope is the current query or the current stored procedure.
Now for further understanding on scope_identity() and the @@identity functions's differences ,Lets consider if you have a trigger on the table. If you have a query that inserts a record, causing the trigger to insert another record on an other table, the scope_identity() function will return the identity created by the query, while the @@identity function will return the identity created by the trigger.
Replied by: Junaid Aziz | Replied on: Jul 13, 2018