Can we use dynamic SQL in cursor?
The SQL Dynamic Cursors are exactly opposite to Static Cursors. You can use this SQL Server Dynamic cursor to perform INSERT, DELETE, and UPDATE operations. Unlike static cursors, all the changes made in the Dynamic cursor will reflect the Original data.
What is static and dynamic cursor in Oracle?
A static cursor supports both Relative and Absolute Positioning whereas a Dynamic Cursor supports only Relative Positioning. •A Static Cursor can be used for Bookmarking purposes as the data returned is static whereas a Dynamic Cursor can’t be used for the same.
What is dynamic SQL in Oracle with example?
For example, dynamic SQL lets you create a procedure that operates on a table whose name is not known until runtime. Oracle includes two ways to implement dynamic SQL in a PL/SQL application: Native dynamic SQL, where you place dynamic SQL statements directly into PL/SQL blocks.
How is SYS _ REFCURSOR weakly typed in SQL?
As SYS_REFCURSOR is a weakly typed Ref-Cursor, it assumes any record structure as its return type during its run time. When we open a cursor variable created with the SYS_REFCURSOR type, a reference is created in the SGA, which can be then passed to another program or client environment as a cursor variable.
When is a REF CURSOR defined without a return type?
When a Ref-Cursor is defined without a return type, it is called as a weakly typed dynamic Ref-Cursor. There is no dependency on its return structure, thus making it open to all SELECT statements independent of its structure.
When to use a REF CURSOR in SQL?
A Ref-Cursor can shift its pointer from one SQL to another at run time, unlike the explicit cursors, which makes the former the preferred one over the latter.
What is the return type of func _ refcur?
In the below code listing, the function FUNC_REFCUR has the Oracle defined weakly typed SYS_REFCURSOR as its return type for returning the result set of the EMPLOYEES table for a particular department, which is passed as its input parameter. OPEN l_rc_var1 FOR SELECT * FROM employees WHERE department_id=ip_dept_id;