How do you write an if statement in PL SQL?

How do you write an if loop in PL SQL?

Syntax for IF-THEN-ELSE Statements:

IF <condition: returns Boolean> THEN -executed only if the condition returns TRUE <action_blockl> ELSE -execute if the condition failed (returns FALSE) <action_block2> END if; In the above syntax, keyword ‘IF’ will be followed by a condition which evaluates to ‘TRUE’/’FALSE’.

How many else clauses can an if statement have in PL SQL?

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.

What are the conditional statements in PL SQL?

Conditional selection statements, which run different statements for different data values. The conditional selection statements are IF and CASE . Loop statements, which run the same statements with a series of different data values.

Conditional Selection Statements

  • IF THEN.
  • IF THEN ELSE.
  • IF THEN ELSIF.
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What are the two subtypes of the IF conditional statement in PL SQL?

An IF statement has two forms: IF-THEN and IF-THEN-ELSE. An IF-THEN statement allows you to specify only one group of actions to take. In other words, this group of actions is taken only when a condition evaluates to TRUE. An IF-THEN-ELSE statement allows you to specify two groups of actions.

What is procedure in PL SQL with example?

Procedure Vs. Function: Key Differences

Procedure Function
Used mainly to a execute certain process Used mainly to perform some calculation
Cannot call in SELECT statement A Function that contains no DML statements can be called in SELECT statement
Use OUT parameter to return the value Use RETURN to return the value

What is the if statement?

The IF statement is a decision-making statement that guides a program to make decisions based on specified criteria. The IF statement executes one set of code if a specified condition is met (TRUE) or another set of code evaluates to FALSE.

Can we use else if in Plsql?

Syntax (IF-THEN-ELSE)

The syntax for IF-THEN-ELSE in Oracle/PLSQL is: IF condition THEN {… statements to execute when condition is TRUE…} ELSE {… … You use the IF-THEN-ELSE syntax, when you want to execute one set of statements when condition is TRUE or a different set of statements when condition is FALSE.

How many else clauses can an if statement have?

When you want to define more than two blocks of statements, use the ElseIf Statement. You can nest up to ten levels of If… Then… Else statements. If you need to create an expression with more than ten levels, you must redefine it using the ElseIf statement or the Select Case…

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What does a conditional statement look like?

A conditional statement is a statement that can be written in the form “If P then Q,” where P and Q are sentences. For this conditional statement, P is called the hypothesis and Q is called the conclusion. Intuitively, “If P then Q” means that Q must be true whenever P is true.

How many types of unconditional statements are there?

In C Programming Language, There are four types of unconditional control transfer statements.

Is statement in PL SQL?

PL/SQL IF THEN statement

The condition is a Boolean expression that always evaluates to TRUE, FALSE, or NULL. If the condition evaluates to TRUE, the statements after the THEN execute. Otherwise, the IF statement does nothing.

Where do you declare variables in PL SQL procedures?

PL/SQL variables must be declared in the declaration section or in a package as a global variable. When you declare a variable, PL/SQL allocates memory for the variable’s value and the storage location is identified by the variable name.

What is a conditional control structure?

A conditional control structure is used to execute statement(s) based on some condition. When the condition is associated with a statement(s) that is true only then we want to execute the related/associated statement(s) otherwise, we want to ignore/skip those statement(s).