How do I do an if-then statement in SQL?

How do I do an if-then statement in SQL?

Syntax. IF (a <= 20) THEN c:= c+1; END IF; If the Boolean expression condition evaluates to true, then the block of code inside the if statement will be executed. If the Boolean expression evaluates to false, then the first set of code after the end of the if statement (after the closing end if) will be executed.

Does SQL support if/then else?

In MS SQL, IF…ELSE is a type of Conditional statement. Any T-SQL statement can be executed conditionally using IF… ELSE. If the condition evaluates to True, then T-SQL statements followed by IF condition in SQL server will be executed.

How do you do multiple if conditions in SQL?

Multiple IF conditions using ELSE

1. — test if a condition is true. IF (condition is true) BEGIN.
2. DO THING A. DO THING B. END.
3. ELSE. BEGIN. DO THING C.
4. DO THING D. DO THING E. END.

What is the use and syntax of IF THEN statement?

Multiline syntax When an If Then Else statement is encountered, condition is tested. If condition is True , the statements following Then are executed. If condition is False , each ElseIf statement (if there are any) is evaluated in order.

What is the difference between inner and outer join?

The major difference between inner and outer joins is that inner joins result in the intersection of two tables, whereas outer joins result in the union of two tables.

Which part of IF statement should be indented?

The correct answer is “The statements within if”. There is a typo mistake. It should be “if” not “it”.

How does else if work in 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.

What is an example of an IF-THEN statement?

Sally eats a snack if she is hungry. In if-then form, the statement is If Sally is hungry, then she eats a snack. The hypothesis is Sally is hungry and the conclusion is she eats a snack.

When to use if or else in SQL?

In MS SQL, IF…ELSE is a type of Conditional statement. Any T-SQL statement can be executed conditionally using IF… ELSE. If the condition evaluates to True, then T-SQL statements followed by IF keyword will be executed. If the condition evaluates to False, then T-SQL statements followed by ELSE keyword will be executed.

What happens if condition evaluates to false in T-SQL?

If the condition evaluates to False, then T-SQL statements followed by ELSE keyword will be executed. Once, either IF T-SQL statements or ELSE T-SQL statement is executed, then other unconditional T-SQL statements continues execution.

When is the IF THEN statement true in SQL?

Only if the subquery returns at least one row does this condition be true. In this example, the IF …THEN statement evaluates whether a record exists in the customer table. If the condition is true, then the program proceeds to delete the relevant records from the table.

How can logic be used in SQL Server?

SQL Server has a unique capability of allowing you to execute real-time programmatic logic on the values within your query. Based on those logical evaluations, you can generate various values as part of the returned data set. Using the CASE Statement