Which variable can hold only single value?

A variable can only store one value at a time – a number or a string. A value stored in a variable can be used once or many times in a program. Variables are like whiteboards.

Which of the following code fragments tells the system to look up the data type of a database column and use it for the declared variable?

The TYPE attribute tells the system to look up the data type of a database column and use it for the declared variable.

How do you declare a PL SQL table of records to hold the rows selected from the EMP table?

DECLARE TYPE EmpTabTyp IS TABLE OF emp%ROWTYPE INDEX BY BINARY_INTEGER; emp_tab EmpTabTyp; i BINARY_INTEGER := 0; CURSOR c1 IS SELECT * FROM emp; BEGIN OPEN c1; LOOP i := i + 1; /* Fetch entire row into record stored by ith element.

Which of the following allow us to repeat the processing of a desired portion of code?

Loops are used for situations in which we need to repeat a line or lines of code within our block. The basic loop uses the LOOP and END LOOP markers to begin and end the loop code.

Which of the following is used to declare a record?

1) Which of the following is used to declare a record? Explanation: The %ROWTYPE attribute helps in creating table and cursor based records.

What is the use of an index?

Indexes are used to quickly locate data without having to search every row in a database table every time a database table is accessed. Indexes can be created using one or more columns of a database table, providing the basis for both rapid random lookups and efficient access of ordered records.

What type of control structures are repetition statements that enable you to execute statements in a Plsql block repeatedly?

Overview of PL/SQL Control Structures

The iteration structure executes a sequence of statements repeatedly as long as a condition holds true. The sequence structure simply executes a sequence of statements in the order in which they occur.

How many loops are there in PL SQL?

four kinds
PL/SQL provides four kinds of loop statements: basic loop, WHILE loop, FOR loop, and cursor FOR loop.

What is SQL Rowcount in Oracle?

The value of the SQL%ROWCOUNT attribute refers to the most recently executed SQL statement from PL/SQL. To save an attribute value for later use, assign it to a local variable immediately. The SQL%ROWCOUNT attribute is not related to the state of a transaction.

Which iteration structure executes a sequence of statements repeatedly?

LOOP statements execute a sequence of statements multiple times. There are three forms of LOOP statements: LOOP , WHILE-LOOP , and FOR-LOOP .

Which of the following statement is used to close a loop in PL SQL?

The EXIT statement allows you to unconditionally exit the current iteration of a loop.

What are the different control structures supported in PL SQL?

Overview of PL/SQL Control Structures. Conditional Control: IF and CASE Statements. Iterative Control: LOOP and EXIT Statements. Sequential Control: GOTO and NULL Statements.

Which structure executes a sequence of statements repeatedly as long as a condition holds true * 1 point?

Iteration structure executes sequence of statements repeatedly – PL/SQL. Q. Which structure executes a sequence of statements repeatedly as long as a condition holds true? The iteration structure is obtained by the use of loop constructs.

Which loop executes a sequence of statements multiple times?

The for loop executes a sequence of statements multiple times and abbreviates the code that manages the loop variable. Explanation: The for loop can iterate over sequence elements, such as a list or a string. It’s often used when we have a piece of code that we want to repeat several times.

Which statements execute a sequence of statements multiple times choose the answer loop statement null statement merge statement all the above?

ANSWER: LOOP

A loop helps us in executing a statement or a group of statement multiple times depending on the block of code.

Which of the following combines the data manipulating power of SQL?

PL/SQL
Thus, PL/SQL combines the data manipulating power of SQL with the data processing power of procedural languages.

Which statement chooses from a sequence of conditions and executes a corresponding statement?

CASE statement
The CASE statement chooses from a sequence of conditions, and executes a corresponding statement. The CASE statement evaluates a single expression and compares it against several potential values, or evaluates multiple Boolean expressions and chooses the first one that is TRUE .

Which of the following results are true when a rollback statement is issued to the database?

When a ROLLBACK statement is issued to the database, the transaction has ended, and the following results are true: All work done by the transaction is undone, as if it hadn’t been issued. Any locks acquired by the transaction are released.