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This Video contains In-depth coverage of @@IDENTITY Vs SCOPE_IDENTITY() Vs IDENT_CURRENT in SQL. Covers all of the important queries and SQL commands. You'll learn how to read and write complex queries. Handle tricky SQL interview questions. Implement complex SQL queries and answer popular interview questions on SQL. This Video series will help to get jobs in SQL Developer, Database Developer, Data Engineer, Reporting Analyst, Data Analyst, Data Scientist, System Analyst, Power BI Developer, Tableau Developer, BI Developer, etc.
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SCOPE_IDENTITY is:
SCOPE_IDENTITY returns the last IDENTITY value inserted into an IDENTITY column in the same scope.
SCOPE_IDENTITY returns the last identity value generated for any table in the current session and the current scope.
A scope is a module; a Stored Procedure, trigger, function, or batch.
Thus, two statements are in the same scope if they are in the same Stored Procedure, function, or batch.
The SCOPE_IDENTITY() function will return the NULL value if the function is invoked before any insert statements into an identity column occur in the scope.
What IDENT_CURRENT is
IDENT_CURRENT is:
IDENT_CURRENT returns the last identity value generated for a specific table in any session and any scope.
IDENT_CURRENT is not limited by scope and session; it is limited to a specified table.
@@IDENTITY is:
@@IDENTITY returns the last identity value generated for any table in the current session, across all scopes.
After an INSERT, SELECT INTO, or bulk copy statement completes, @@IDENTITY contains the last identity value generated by the statement.
If the statement did not affect any tables with identity columns, @@IDENTITY returns NULL.
If multiple rows are inserted, generating multiple identity values, @@IDENTITY returns the last identity value generated.
The @@IDENTITY value does not revert to a previous setting if the INSERT or SELECT INTO statement or bulk copy fails, or if the transaction is rolled back.
Differences
The differences between them are:
SCOPE_IDENTITY, IDENT_CURRENT, and @@IDENTITY are similar functions in that they return values inserted into IDENTITY columns.
SCOPE_IDENTITY and @@IDENTITY will return the 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. A scope is a module; a Stored Procedure, trigger, function, or batch.
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