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How do you loop a cursor?
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.
Can we use FOR LOOP in cursor?
Introduction to PL/SQL cursor FOR LOOP statement A nice feature of the cursor FOR LOOP statement is that it allows you to fetch every row from a cursor without manually managing the execution cycle i.e., OPEN , FETCH , and CLOSE . If there is no row to fetch, the cursor FOR LOOP closes the cursor.
Can we create a cursor in procedure?
To use cursors in SQL procedures, you need to do the following: Open the cursor to establish the result set. Fetch the data into local variables as needed from the cursor, one row at a time. Close the cursor when done.
Which command is used to open a cursor FOR LOOP?
The command used to open a CURSOR FOR loop is None, cursor for loops handle cursor opening implicitly.
What is difference between cursor and while loop?
Loop and cursor can be utilized in a circumstance to deal with row-based processing in T-SQL. While SQL While loop is quicker than a cursor, reason found that cursor is defined by DECLARE CURSOR. Every emphasis of the loop will be executed inside system memory and consuming required server assets.
What is difference between procedure and cursor?
A function or procedure is a set of instructions to perform some task. A cursor is an array that can stores the result set of a query. Stored procedures are pre-compiled objects and executes as bulk of statements, whereas cursors are used to execute row by row.
How does the Cursor FOR loop statement work?
The following illustrates the syntax of the cursor FOR LOOP statement: The record is the name of the index that the cursor FOR LOOP statement declares implicitly as a %ROWTYPE record variable of the type of the cursor. The record variable is local to the cursor FOR LOOP statement.
How to create a cursor with IF condition?
PL/SQL cursor with IF condition 1 There is a table (Table1) with Key Value pairs. 2 If the Table1 value is TRUE then the cursor should be created with STUDENT table 3 If the table1 value is FALSE then the cursor should be created with EMP table. More
How does SQL Cursor FOR loop work in Oracle?
Note that Oracle Database automatically optimizes a cursor FOR LOOP to work similarly to a BULK COLLECT query. Although your code looks as if it fetched one row at a time, Oracle Database fetches multiple rows at a time and allows you to process each row individually. PL/SQL cursor FOR LOOP examples
When to use a for loop in SQL?
PL/SQL cursor loop statement is used for fetching and processing each and every record one by one which is referred to by a cursor. The FOR LOOP is used by the cursor for carrying out the repetitive task of processing the records retrieved from the cursor reference.