- Identity (or AutoNumber) is a column that automatically generates numeric values.
- A start and increment value can be set, but most DBA leave these at 1.
- A GUID column also generates numbers; the value of this cannot be controlled.
- Identity/GUID columns do not need to be indexed.
- SELECT @@IDENTITY - returns the last IDENTITY value produced on a connection
- SELECT IDENT_CURRENT ('tablename') - returns the last IDENTITY value produced in a table
- SELECT SCOPE_IDENTITY() - returns the last IDENTITY value produced on a connection.
Tuesday, January 26, 2016
What is an Identity?
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