How do I use two cursors in PL SQL?

Show activity on this post. 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.

How do I use two cursors in PL SQL?

Show activity on this post. 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.

How do I pass a value from one cursor to another cursor in Oracle PL SQL?

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 iterate through a cursor in SQL?

The cursor FOR LOOP implicitly creates its loop index as a record variable with the row type in which the cursor returns and then opens the cursor. In each loop iteration, the cursor FOR LOOP statement fetches a row from the result set into its loop index.

What is fetch next from cursor?

If FETCH NEXT is the first fetch against a cursor, it returns the first row in the result set. NEXT is the default cursor fetch option. PRIOR. Returns the result row immediately preceding the current row, and decrements the current row to the row returned.

Can we use nested cursor in SQL Server?

SQL developers can create nested cursor in SQL Server by defining an outer cursor and within the cursor code a new cursor is defined for each row in main cursor select. The inner cursor is created, executed, closed and deallocated each time in the outer cursor for each row.

Can we have 2 cursors in a procedure?

Your use of cursors here is totally inappropriate. Your logic in the second cursor is also flawed since it will select any record which inludes the friend, not just the required friendship. If you wanted to fix it you could try giving the second cursor a differant name, but preferably start over.

How do I pass one cursor to another 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 open a cursor twice?

Exactly, you can’t read a cursor twice.

How do you exit a loop cursor in PL SQL?

END LOOP; In such cases, you must use an EXIT statement to exit the loop. If you use an EXIT statement to exit a cursor FOR loop prematurely, the cursor is closed automatically. The cursor is also closed automatically if an exception is raised inside the loop.

What is implicit cursor in PL SQL?

Implicit cursors are automatically created by Oracle whenever an SQL statement is executed, when there is no explicit cursor for the statement. Programmers cannot control the implicit cursors and the information in it.

What is fetch next in SQL Server?

FETCH is a command in standard query language (SQL) that is used to retrieve rows from a SELECT query based on the position of a cursor. When we use NEXT as direction in conjugation with FETCH, we get FETCH NEXT that retrieves the next single row. If there is no such row, then the command returns an empty result.

How do you create a cursor in SQL?

– Most Common SQL Server Cursor Syntax – SQL Server Cursor as a Variable – SQL Server Cursor as Output of a Stored Procedure – SQL Server Cursor Current Of Example – SQL Server Cursor Alternative with a WHILE Loop

What is the use of cursor in Oracle?

Implicit Cursor. Whenever any DML operations occur in the database,an implicit cursor is created that holds the rows affected,in that particular operation.

  • Explicit Cursor. Programmers are allowed to create named context area to execute their DML operations to get more control over it.
  • Cursor Attributes.
  • FOR Loop Cursor statement.
  • What is an open cursor in Oracle?

    – In the above syntax, the declaration part contains the declaration of the cursor and the cursor variable in which the fetched data will be assigned. – The cursor is created for the ‘SELECT’ statement that is given in the cursor declaration. – In execution part, the declared cursor is opened, fetched and closed.

    How to create cursor in SQL Server with example?

    We have first declared three variables that will hold data from the cursor temporarily.

  • Then we have declared a temp variable that will hold cursor result set data.
  • Then we have declared a cursor for the AutoId,FirstName,LastName columns from the PersonalDetails table.
  • Then we have opened the cursor