SQL If Else Statement | How do I write if else in SQL?
In this article, you will learn how to use SQL Server If Else Condition to control the flow of program with syntax and examples
The SQL IF ELSE statement is a control-flow statement that allows you to execute or skip the statement block based on a specific condition.
Introduction: SQL If Else Statement
The IF Else statement is used to execute the code segment when a condition will be TRUE, or you can execute different code segments of the condition evaluates to FALSE.
Therefore, SQL if statements will test the condition first because it depending upon the result, if condition TRUE then it will execute the statements otherwise if Condition is False then the statement will not execute. So, the If Else statement is one of the most useful decision-making statements.
In SQL IF…ELSE statement to control the flow of programming.
If Else statement in SQL Server is one of the most useful decision-making statements.
Syntax: SQL If Else
The syntax for the SQL Server (Transact-SQL) in IF…ELSE statement is:
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IF (Test condition or Expression) BEGIN -- If the condition is TRUE then these statements will be executed True statements; END ELSE BEGIN -- If the condition is FALSE then these statements will be executed False statements; END |
This SQL Server (T-SQL) if-else statement accepts any test condition as the argument. therefore, If the test condition or expression in the above structure is true, then True statements will execute. otherwise, If the condition is false, then False statements will run.
Else Optional: Therefore, You should use the ELSE condition, in that case when you want to execute a set of statements when the IF condition evaluated to FALSE (ie: the condition was not met then use the Else Condition).
There is no ELSE IF condition within the IF…ELSE statement. Instead, you’ll have to nest multiple IF…ELSE statements to realize the required result.
SQL If Else Statement Flow chart
Let us see the flow chart Diagram of the SQL If Else statement for understanding in a better way.
Therefore, If the condition is true, then the IF T-SQL Conditional statement will run, followed by Other unconditional T-SQL Statements. If the condition is False, then ELSE T-SQL Conditional Statements will run, followed by Other unconditional T-SQL Statements. Because it’s out of the if-else condition, and it’s nothing to try and do with the SQL Server condition result.
SQL If Statements
Here, If Your are not aware IF Condition then we need to Understand First, SQL If Statement, There are the given below following illustrates the syntax of the IF statement:
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IF boolean_expression BEGIN { statement_block } END |
In the above syntax, therefore, if the Boolean_expression evaluates to TRUE then the statement_block within the BEGIN…END block is executed. Otherwise, the statement_block is skipped, and therefore the control of the program is passed to the statement after the END keyword.
SELECT statement, then you need to enclose the SELECT statement in parentheses.
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