By Can we use FOR LOOP in ref cursor?
1 Answer. A ref cursor being a pointer to an open cursor used to send an open cursor as an out argument to the client app to loop through the record.
How is the loop index of cursor FOR LOOP declared?
The cursor FOR LOOP statement implicitly declares its loop index as a record variable of the row type that a specified cursor returns, and then opens a cursor. With each iteration, the cursor FOR LOOP statement fetches a row from the result set into the record.
What is the difference between cursor and ref cursor in Oracle?
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 is use of ref cursor in Oracle?
Using REF CURSOR s is one of the most powerful, flexible, and scalable ways to return query results from an Oracle Database to a client application. A REF CURSOR is a PL/SQL data type whose value is the memory address of a query work area on the database.
What is ref cursor example?
A ref cursor is a variable, defined as a cursor type, which will point to, or reference a cursor result. The advantage that a ref cursor has over a plain cursor is that is can be passed as a variable to a procedure or a function. The REF CURSOR can be assigned to other REF CURSOR variables.
What are the different types of cursor?
Cursors are used to store Database Tables. There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors. These are explained as following below….What is Cursor in SQL ?
- Declare Cursor Object.
- Open Cursor Connection.
- Fetch Data from cursor.
- Close cursor connection.
- Deallocate cursor memory.
What are the benefits of cursor FOR loop?
PL/SQL cursor FOR loop has one great advantage of loop continued until row not found. In sometime you require to use explicit cursor with FOR loop instead of use OPEN, FETCH, and CLOSE statement. FOR loop iterate repeatedly and fetches rows of values from database until row not found.
Which isn’t the characteristics of a cursor FOR loop?
9) The command used to open a CURSOR FOR loop is None, cursor for loops handle cursor opening implicitly.
What is strong and weak ref cursor?
A strongly typed ref cursor always returns a known type, usually from a declared TYPE object. A weakly typed ref cursor has a return type that is dependant on the SQL statement it executes, i.e. only once the cursor is opened is the type known (at runtime).
What is difference between cursor and for loop?
Unlike an implicit cursor, you can reference an explicit cursor or cursor variable by its name. Therefore, an explicit cursor or cursor variable is called a named cursor. The cursor FOR LOOP statement lets you run a SELECT statement and then immediately loop through the rows of the result set.
Which is not type of cursor?
Explanation: SQL Server supports four types of cursor. Explanation: Cursor alternatives are WHILE loop, subqueries, Temporary tables and Table variables. Explanation: We should use cursor in that case when there is no option except cursor. 6.