Best answer: Can you do an if statement in SQL query?

We can use SQL IF statement without ELSE as well. In the following, the expression evaluates to TRUE; therefore, it prints the message. If the expression evaluates to FALSE, it does not return any output.

How do you write an if statement in SQL Select query?

Use a CASE statement: SELECT CASE WHEN (Obsolete = ‘N’ OR InStock = ‘Y’) THEN ‘Y’ ELSE ‘N’ END as Available etc… See working demo: if then without case in SQL Server.

Can we use if statement in select query in SQL?

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. If the condition evaluates to False, then T-SQL statements followed by ELSE keyword will be executed.

How do you add an if else condition in SQL query?

An optional extra is to add a column name to our result.

  1. case when condition1 then result1 when condition2 then result2 when condition3 then result3 else result end as columnname;
  2. select game, year, case when game like ‘sonic%’ then ‘Y’ else ‘N’ end as ‘Sonic Series’ from sega_sales order by ‘Sonic Series’ desc.
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How do you do if then 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.

Can you use or in SQL?

The OR condition can be used in the SQL UPDATE statement to test for multiple conditions. This example would update all favorite_website values in the customers table to techonthenet.com where the customer_id is 5000 or the last_name is Reynolds or the first_name is Paige.

How do you write multiple cases in SQL?

SELECT (case A. column1 when ‘1’ then (select value from B where B. clientId=100 and ‘1’=B.Id) when ‘2’ then (select value from C where C.

How use multiple IF condition in SQL query?

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.

How do you write a conditional statement in SQL?

SQL | Conditional Expressions

  1. The CASE Expression: Let you use IF-THEN-ELSE statements without having to invoke procedures. …
  2. The DECODE Function : Facilitates conditional inquiries by doing the work of a CASE or IF-THEN-ELSE statement. …
  3. COALESCE : Returns the first non-null argument.

Is true in SQL?

In SQL, a Boolean value – either TRUE , FALSE or UNKNOWN – is a truth value.

Boolean operators.

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If the first Boolean value is: … and the second Boolean value is: … then the result is:
TRUE FALSE TRUE
TRUE UNKNOWN TRUE
FALSE TRUE TRUE
FALSE FALSE FALSE

How do you check if a value is not null in SQL?

How to Test for NULL Values?

  1. SELECT column_names. FROM table_name. WHERE column_name IS NULL;
  2. SELECT column_names. FROM table_name. WHERE column_name IS NOT NULL;
  3. Example. SELECT CustomerName, ContactName, Address. FROM Customers. WHERE Address IS NULL; …
  4. Example. SELECT CustomerName, ContactName, Address. FROM Customers.

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.

How many else clauses can an if statement have?

No, there can be only one else per if . Since an else if is a new if , it can have a new else – you can have as many else if s as you want.

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