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What are implicit cursors and explicit cursors in PL/SQL. For example, When you execute INSERT, UPDATE, or DELETE statements the cursor attributes tell us
Oracle Database PL/SQL Language Reference .. Every SQL (implicit) cursor has six attributes, each of which returns useful For example, %ROWCOUNT returns the total number of rows processed by all executions of the SQL statement.
of the relative performance of implicit and explicit cursors in Oracle PL/SQL. evident in a comparison with a cursor FOR loop, as show in the example below.
Implicit cursors in PL/SQL are far faster than explicit PL/SQL cursors. Note that an implicit cursor run faster than an explicit cursor because we do not have to have a separate step to declare, open, fetch and close the cursor.
When this block is executed, the cursor variable returns the required value, but the variable in the INTO clause remains null. Oracle documentation in 12c about the SELECT statement in the implicit cursor FOR loops, SQL SELECT statement (not PL/SQL SELECT INTO statement).
In PL/SQL, you can refer to the most recent implicit cursor as the SQL cursor, Example. We will be using the CUSTOMERS table we had created and used in
Oracle uses implicit cursors for its internal processing. Even if we execute a SELECT statement Oracle reserves a private SQL area in memory Example Code.
Example 1 of an Implicit cursors. In the following PL/SQL code block, the select statement makes use of an implicit cursor: Begin Update emp Where 1=2;
The cursor FOR LOOP statement implicitly declares its loop index as a record variable of PL/SQL declares, opens, fetches from, and closes an implicit cursor. Example 6-20, "Passing Parameters to Explicit Cursor FOR LOOP Statement".
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