How do you declare a cursor variable?
A cursor variable is like an explicit cursor that is not limited to one query. To create a cursor variable, either declare a variable of the predefined type SYS_REFCURSOR or define a REF CURSOR type and then declare a variable of that type.
What are the cursor variables?
A cursor variable is a cursor that contains a pointer to a query result set. The result set is determined by execution of the OPEN FOR statement using the cursor variable. A cursor variable, unlike a static cursor, is not associated with a particular query.
Which statements are used to control a cursor variable?
You use three statements to control a cursor variable: OPEN – FOR , FETCH , and CLOSE . First, you OPEN a cursor variable FOR a multi-row query. Then, you FETCH rows from the result set. When all the rows are processed, you CLOSE the cursor variable.
What is the difference between ref cursor and Sys Ref cursor in Oracle?
There is no difference between using a type declared as REF CURSOR and using SYS_REFCURSOR , because SYS_REFCURSOR is defined in the STANDARD package as a REF CURSOR in the same way that we declared the type ref_cursor .
Can ref cursor be used with procedure of parameter?
Yes, of course, you can pass a cursor variable as parameter to a procedure and to fetch from in in that procedure.
Which statement associates a cursor variable with multi-row query execute the query and identifies the result set?
OPEN-FOR-USING Statement
OPEN-FOR-USING Statement. The OPEN-FOR-USING statement associates a cursor variable with a multi-row query, executes the query, identifies the result set, positions the cursor before the first row in the result set, then zeroes the rows-processed count kept by %ROWCOUNT .
How to declare a cursor variable in PL/SQL?
To declare a cursor variable, you use the REF CURSOR is the data type. PL/SQL has two forms of REF CURSOR typeS: strong typed and weak typed REF CURSOR.
How are cursor variables defined?
How cursor variables are defined is the topic of the next section. Cursor variables are defined using a REF CURSOR type. The type is defined in one of two ways: Strongly Typed – The REF CURSOR type is restricted to an individual return type using the RETURN clause.
What is REF CURSOR type in PL/SQL?
PL/SQL has two forms of REF CURSOR typeS: strong typed and weak typed REF CURSOR. The following shows an example of a strong REF CURSOR. DECLARE TYPE customer_t IS REF CURSOR RETURN customers%ROWTYPE; c_customer customer_t; Code language: SQL (Structured Query Language) (sql)
What is the return type of strongly typed REF CURSOR?
PL/SQL procedure successfully completed. The return value of a strongly typed REF CURSOR must be a record which can be defined using the %ROWTYPE and %TYPE attributes or as a record structure. The return_types.sql script gives an example of each method along with an invalid scalar definition.