Your question: How if else works in PL SQL?

If the condition evaluates to TRUE, then the statements between THEN and ELSE execute. In case the condition evaluates to FALSE or NULL, the else_statements between ELSE and END IF executes.

How do you write if else condition in PLSQL?

The syntax for IF-THEN-ELSE in Oracle/PLSQL is: IF condition THEN {… statements to execute when condition is TRUE…} ELSE {… statements to execute when condition is FALSE…}

How if else works SQL?

The SQL Server else if statement handles multiple statements effectively by executing them sequentially. It will check for the first condition. If the condition is TRUE, then it will execute the statements present in that block. … Because ELSE IF conditions only execute if it’s previous IF or ELSE IF statement fails.

How many else clauses can an if statement have in PLSQL?

An IF statement can have any number of ELSIF clauses; the final ELSE clause is optional. Boolean expressions are evaluated one by one from top to bottom. If any expression returns TRUE , its associated sequence of statements is executed and control passes to the next statement.

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Can we use if statement in Oracle SQL query?

The PL/SQL IF statement allows you to execute a sequence of statements conditionally. The IF statement evaluates a condition. The condition can be anything that evaluates to a logical value of true or false such as comparison expression or a combination of multiple comparison expressions.

Which of the following is not an optional block in PLSQL structure?

A PL/SQL block consists of three sections: declaration, executable, and exception-handling sections. In a block, the executable section is mandatory while the declaration and exception-handling sections are optional. … An anonymous block is not saved in the Oracle Database server, so it is just for one-time use.

What is exception-handling in PLSQL?

In PL/SQL, a warning or error condition is called an exception. … When an error occurs, an exception is raised. That is, normal execution stops and control transfers to the exception-handling part of your PL/SQL block or subprogram. Internal exceptions are raised implicitly (automatically) by the run-time system.

How does if else work?

The if/else if statement allows you to create a chain of if statements. The if statements are evaluated in order until one of the if expressions is true or the end of the if/else if chain is reached. If the end of the if/else if chain is reached without a true expression, no code blocks are executed.

What is if else if else statement?

If / Else / Else If conditional statements are conditional statements that have more than one condition. If the first condition is false, only then will the second condition will be checked. If the second one is also false, then the app will default to else or it will do nothing.

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How do you use if else?

Conditional Statements

  1. Use if to specify a block of code to be executed, if a specified condition is true.
  2. Use else to specify a block of code to be executed, if the same condition is false.
  3. Use else if to specify a new condition to test, if the first condition is false.

Which of the following is optional while using if/then else if statement?

After executing the statements following Then or Else, the program continues with the statement following End If. The Else and ElseIf blocks are both optional.

How do you close an if statement in PLSQL?

Syntax for IF THEN Statements:

IF <condition: returns Boolean> THEN -executed only if the condition returns TRUE <action_block> END if; In the above syntax, keyword ‘IF’ will be followed by a condition which evaluates to ‘TRUE’/’FALSE’. The control will execute the <action_block> only if the condition returns <TRUE>.

Which of the following is not true about PLSQL package specifications?

Q 24 – Which of the following is not true about PL/SQL package specifications? A – The specification is the interface to the package. B – It declares the types, variables, constants, exceptions, cursors, and subprograms that can be referenced from outside the package.

What is PLSQL in Rdbms?

PL/SQL is basically a procedural language, which provides the functionality of decision making, iteration and many more features of procedural programming languages. PL/SQL can execute a number of queries in one block using single command.

What are kinds of IF-THEN statement?

Hypotheses followed by a conclusion is called an If-then statement or a conditional statement. This is read – if p then q. A conditional statement is false if hypothesis is true and the conclusion is false. The example above would be false if it said “if you get good grades then you will not get into a good college”.

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What is loop in PLSQL?

The LOOP statement executes a sequence of statements within a PL/SQL code block multiple times. WHILE statement (PL/SQL) The WHILE statement repeats a set of SQL statements as long as a specified expression is true. The condition is evaluated immediately before each entry into the loop body.