Updating row using cursor oracle
This temporary work area is used to store the data retrieved from the database, and manipulate this data.A cursor can hold more than one row, but can process only one row at a time.When your application requires consistent data for the duration of the transaction, not reflecting changes by other transactions, you can achieve transaction-level read consistency by using explicit locking, read-only transactions, serializable transactions, or by overriding default locking.Row locking at transactional level can be achieved with “SELECT FOR UPDATE” statement.Note: The material on triggers that was formerly in this document has been moved to A New Document on Constraints and Triggers. PL/SQL extends SQL by adding constructs found in procedural languages, resulting in a structural language that is more powerful than SQL. All PL/SQL programs are made up of blocks, which can be nested within each other.Typically, each block performs a logical action in he program.Even though the cursor stores multiple records, only one record can be processed at a time, which is called as current row.When you fetch a row the current row position moves to next row.
They must be created when you are executing a SELECT statement that returns more than one row.
Cursors enable manipulation of whole result sets at once.
In this scenario, a cursor enables the rows in a result set to be processed sequentially.
I have a Oracle database table with some fields (columns) in numeric format.
Now I need to update one column, namely store_id, to make it a primary column with unique number id.