1 Answer. It is possible to reference another cursor within the first one: declare cursor c1 is select distinct Assigned from table_name; cursor c2(p_Assigned in varchar2) is select id, Assigned from table_name where Assigned = p_Assigned; begin for r1 in c1 loop dbms_output.
How do I use two cursors in PL SQL?
DECLARE AA NUMBER; CURSOR S IS SELECT ENAME, SAL FROM EMP; CURSOR D IS SELECT ENAME, SAL FROM EMP; NAME EMP. ENAME%TYPE; SALARY EMP. SAL%TYPE; C NUMBER; BEGIN AA := :NUMBER_OF_EMP; SELECT COUNT(EMPNO) INTO C FROM EMP; OPEN S; FOR A IN 1..AA LOOP FETCH S INTO NAME, SALARY; DBMS_OUTPUT.
Can you pass a parameter to a cursor?
An explicit cursor may accept a list of parameters. Each time you open the cursor, you can pass different arguments to the cursor, which results in different result sets. In the cursor query, each parameter in the parameter list can be used anywhere which a constant is used.
How do you pass values at runtime in PL SQL?
In PL/SQL, we can pass parameters to procedures and functions in three ways. 1) IN type parameter: These types of parameters are used to send values to stored procedures. 2) OUT type parameter: These types of parameters are used to get values from stored procedures. This is similar to a return type in functions.
Can we pass parameters to cursor in Oracle?
We can pass parameters into a cursor and use them in the query. We can only pass values to the cursor; and cannot pass values out of the cursor through parameters.
Can we call cursor inside cursor?
The trick to declaring a cursor within a cursor is that you need to continue to open and close the second cursor each time a new record is retrieved from the first cursor. That way, the second cursor will use the new variable values from the first cursor.
Can we have 2 cursors in a procedure?
Standard cursor in MySQL allow only one HANDLER. However, when we use multiple cursors like a nested loop, the handler will stop both cursors at the same time. Since we cannot declare two handlers for each cursor, we need to use BLOCK. Below is the example of MySQL’s stored procedure using multiple cursors.
What is correct syntax of parameterized cursor?
Syntax of Parameterized Cursor in Oracle Database
CURSOR cur _ name (parameter list) IS SELECT statement; Syntax of declaring a cursor parameter is pretty similar to that of the simple cursor except the addition of parameters enclosed in the parenthesis.
What is parameterized cursor give example?
Parameterized cursors are static cursors that can accept passed-in parameter values when they are opened. The following example includes a parameterized cursor. The cursor displays the name and salary of each employee in the EMP table whose salary is less than that specified by a passed-in parameter value.
Which of the following correctly defines a cursor?
A cursor is a pointer to a temporary area DDL statement. A cursor is a pointer to a permanent work area created in DDL statement.
Which type of cursor is automatically declared?
21) Which type of cursor is automatically declared by Oracle every time an SQL statement is executed? Explanation: The implicit cursor are automatically created.
What are triggers in DB explain their types How do they work?
A database trigger is special stored procedure that is run when specific actions occur within a database. Most triggers are defined to run when changes are made to a table’s data. Triggers can be defined to run instead of or after DML (Data Manipulation Language) actions such as INSERT, UPDATE, and DELETE.
What is trigger in PL SQL with examples?
Triggers are stored programs, which are automatically executed or fired when some events occur. Triggers are, in fact, written to be executed in response to any of the following events − A database manipulation (DML) statement (DELETE, INSERT, or UPDATE) A database definition (DDL) statement (CREATE, ALTER, or DROP).
What is difference between cursor and ref cursor?
A cursor is really any SQL statement that runs DML (select, insert, update, delete) on your database. A ref cursor is a pointer to a result set. This is normally used to open a query on the database server, then leave it up to the client to fetch the result it needs.
What are parameterized cursors?
Parameterized cursors are static cursors that can accept passed-in parameter values when they are opened. … The cursor displays the name and salary of each employee in the EMP table whose salary is less than that specified by a passed-in parameter value.
Why cursor is used in Oracle?
Cursors are used when the user needs to update records in a singleton fashion or in a row by row manner, in a database table. The Data that is stored in the Cursor is called the Active Data Set. Oracle DBMS has another predefined area in the main memory Set, within which the cursors are opened.