List the correct sequence of commands to process a set of records when using explicit cursors
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INITIALIZE, GET, CLOSE
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OPEN, FETCH, CLOSE
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CURSOR, GET, FETCH, CLOSE
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CURSOR, FETCH, CLOSE
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GET, SEEK, HIDE
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None of the above.
To process a set of records using explicit cursors, the correct sequence of commands is:
B. OPEN, FETCH, CLOSE
Explanation:
- The first step is to declare a cursor, which is typically done outside of the sequence of commands listed in the question. The cursor declaration specifies the SELECT statement that defines the result set to be processed.
- The next step is to open the cursor using the OPEN command. This prepares the result set for processing.
- The FETCH command is then used to retrieve each record in the result set one at a time. This command is usually used in a loop, where processing is performed on each record as it is retrieved.
- Finally, the CLOSE command is used to release the resources associated with the cursor.
Therefore, the correct answer is:
The Answer is: B. OPEN, FETCH, CLOSE
The correct sequence is OPEN, FETCH, CLOSE. An explicit cursor in SQL/PL-SQL (or embedded SQL/COBOL) must first be declared, then OPENed to execute its query and position it before the first row, then FETCHed repeatedly to retrieve rows one at a time (looping until no more rows), and finally CLOSEd to release the resources. The other options use nonexistent or out-of-order keywords: INITIALIZE/GET/CLOSE and GET/SEEK/HIDE aren't real cursor verbs, and CURSOR is a declaration keyword, not a runtime action performed in this sequence. So OPEN, FETCH, CLOSE is the standard, correct processing order.