How do I write if else in SQL Server?

Table of Contents

SQL Server: IF…ELSE Statement

Description. In SQL Server, the IF…ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE.
Syntax.
Note.
Example – IF…ELSE Statement.
Example – No ELSE condition.
Example – Nested IF…ELSE Statements.

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.

Is there else if in SQL?

SQL Else If Syntax 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.

How do you write multiple conditions in an if statement in SQL Server?

Multiple IF conditions using ELSE

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

How use multiple IF condition in SQL query?

END TRY BEGIN CATCH SELECT ERROR_MESSAGE() AS ‘Message’ RETURN -1 END CATCH END –The above works I then insert this below and these if statement become nested—- IF(@A!= @SA) BEGIN exec Store procedure @FIELD = 15, more params… END IF(@S!= @SS) BEGIN exec Store procedure @FIELD = 10, more params…

Can I use case in where clause SQL Server?

CASE can be used in any statement or clause that allows a valid expression. For example, you can use CASE in statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as select_list, IN, WHERE, ORDER BY, and HAVING.

What is the use and syntax of IF THEN statement?

Syntax. If the Boolean expression evaluates to true, then the if block will be executed, otherwise, the else block will be executed. C programming language assumes any non-zero and non-null values as true, and if it is either zero or null, then it is assumed as false value.

IS NULL function in SQL?

The syntax for the SQL ISNULL function is as follow. The SQL Server ISNULL function returns the replacement value if the first parameter expression evaluates to NULL. SQL Server converts the data type of replacement to data type of expression.

Can you do multiple if statements in SQL?

We can specify multiple statements as well with SQL IF statement and BEGIN END blocks. In the following query, we want to print a message from two print statements once a condition is satisfied. Note: We should have an END statement with corresponding BEGIN block.

How many else clauses can an if statement have?

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 can you substitute for if exists?

An alternative for IN and EXISTS is an INNER JOIN, while a LEFT OUTER JOIN with a WHERE clause checking for NULL values can be used as an alternative for NOT IN and NOT EXISTS.

What are the syntax rules for SQL?

SQL is followed by a unique set of rules and guidelines called Syntax. This tutorial gives you a quick start with SQL by listing all the basic SQL Syntax. All the SQL statements start with any of the keywords like SELECT, INSERT, UPDATE, DELETE, ALTER, DROP, CREATE, USE, SHOW and all the statements end with a semicolon (;).

What is if statement in SQL?

SQL Else If. The SQL Else If statement is very useful to check multiple conditions at once. It is an extension to the If then Else (which we discussed in the earlier post). If Else statement will only execute the statements when the given condition is either true or False but in real world, we may have to check more than two conditions.

Can you use if statements in a SQL query?

The IF statement is used to execute a block of code if a condition is satisfied . If a condition is not satisfied (FALSE) then optionally ELSE statement can be used. In the case of SQL Server, the IF statement is used to execute SQL statements if a condition is TRUE.

How do I use SQL?

SQL is used for Microsoft and other proprietors’ database functions, including data management for online and offline applications. You can use SQL to search existing databases, modify databases and create new databases and database elements.