Which provide a way for select multiple rows of data from the database?

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Which provide a way for select multiple rows of data from the database?

ANSWER: PL/SQL Cursors The cursor is the pointer to this context area.

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. For INSERT operations, the cursor holds the data that needs to be inserted. For UPDATE and DELETE operations, the cursor identifies the rows that would be affected.

Which cursor is used to process multiple rows?

You should explicitly open and close a cursor before and after use. Example: Fetching Multiple Rows With a Cursor in PL/SQL shows examples of the use of a cursor to process multiple rows in a table. The FETCH statement retrieves the rows in the result set one at a time.

What are the steps for using a cursor?

There are four steps in using an Explicit Cursor.

  • DECLARE the cursor in the Declaration section.
  • OPEN the cursor in the Execution Section.
  • FETCH the data from the cursor into PL/SQL variables or records in the Execution Section.
  • CLOSE the cursor in the Execution Section before you end the PL/SQL Block.

How can you handle multiple rows without using loops in PL SQL?

Handle Multiple Rows Without Loops

  1. Adding delimiters to a file which has no delimiter.
  2. Data from 1 column to be separated in multiple columns.
  3. Handling null in outer join.
  4. Datastage – flat file concat header.
  5. Single row converted into multiple rows using transformer stage.

Which of the following is used to declare a record?

First, you must define a cursor. And then you use %ROWTYPE with the cursor variable to declare a record. The fields of the record correspond to the columns in the cursor SELECT statement. The following is an example of declaring a record based on a cursor.

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.

When should a close statement be used in PL SQL?

After all rows have been retrieved from the result set that is associated with a cursor, the cursor must be closed. The result set cannot be referenced after the cursor has been closed. However, the cursor can be reopened and the rows of the new result set can be fetched.

How do I use cursor to fetch multiple records?

Procedure

  1. Specify the cursor using a DECLARE CURSOR statement.
  2. Perform the query and build the result table using the OPEN statement.
  3. Retrieve rows one at a time using the FETCH statement.
  4. Process rows with the DELETE or UPDATE statements (if required).
  5. Terminate the cursor using the CLOSE statement.

How many steps are there for explicit cursor?

There are four steps in using an Explicit Cursor. DECLARE the cursor in the declaration section. OPEN the cursor in the Execution Section. FETCH the data from cursor into PL/SQL variables or records in the Execution Section. CLOSE the cursor in the Execution Section before you end the PL/SQL Block.

What are the types of cursor?

There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors. These are explained as following below. Implicit Cursors: Implicit Cursors are also known as Default Cursors of SQL SERVER.

Which loop is guaranteed to execute at least one time?

while loop
while loop is guaranteed to execute at least one time.