Can we use switch case in SQL?

@RamSingh – there’s no switch statement in the SQL language. As others have indicated, you can use a CASE expression, but it has to compute and return a scalar value.

Table of Contents

How do you give multiple conditions in a case in SQL?

Here are 3 different ways to apply a case statement using SQL:

(1) For a single condition: CASE WHEN condition_1 THEN result_1 ELSE result_2 END AS new_field_name.
(2) For multiple conditions using AND: CASE WHEN condition_1 AND condition_2 THEN result_1 ELSE result_2 END AS new_field_name.

How do you write 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.

What is switch operator in SQL?

Switch returns a Null value if: None of the expressions is True. The first True expression has a corresponding value that is Null.

How do I pivot data in SQL?

You follow these steps to make a query a pivot table: First, select a base dataset for pivoting. Second, create a temporary result by using a derived table or common table expression (CTE) Third, apply the PIVOT operator.

Is null or is not null?

The IS NULL condition is satisfied if the column contains a null value or if the expression cannot be evaluated because it contains one or more null values. If you use the IS NOT NULL operator, the condition is satisfied when the operand is column value that is not null, or an expression that does not evaluate to null.

Can CASE statement return multiple values?

@yzhang – With CASE only the first match will return values. If you want the possibility of multiple conditions mathcing each input row, you need to make each check indpendantly, and UNION the results together.

Can you have multiple conditions in a CASE statement?

Multiple conditions in CASE statement

You can evaluate multiple conditions in the CASE statement.

Can I use if condition in SQL query?

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.

What is SQL IIF?

SQL Server IIF() Function
The IIF() function returns a value if a condition is TRUE, or another value if a condition is FALSE.

What is switch function?

The SWITCH function evaluates one value (called the expression) against a list of values, and returns the result corresponding to the first matching value. If there is no match, an optional default value may be returned.

Can we PIVOT 2 columns in SQL Server?

You gotta change the name of columns for next Pivot Statement. You can use aggregate of pv3 to sum and group by the column you need. The key point here is that you create new category values by appending 1 or 2 to the end. Without doing this, the pivot query won’t work properly.

How do I PIVOT columns to rows in SQL?

In SQL Server you can use the PIVOT function to transform the data from rows to columns: select Firstname, Amount, PostalCode, LastName, AccountNumber from ( select value, columnname from yourtable ) d pivot ( max(value) for columnname in (Firstname, Amount, PostalCode, LastName, AccountNumber) ) piv; See Demo.

Is NULL () in SQL?

The ISNULL() function returns a specified value if the expression is NULL. If the expression is NOT NULL, this function returns the expression.

Can we SELECT NULL values in SQL?

The IS NULL condition is used in SQL to test for a NULL value. It returns TRUE if a NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.

Can you use a subquery in a Case Statement?

Takeaway: Do not use a subquery as a condition in the CASE expression. If you need to retrieve a value, put the result of the subquery in a variable first. Then, use that variable in the CASE expression.

How do you write a select query in a Case Statement?

The case statement in SQL returns a value on a specified condition. We can use a Case statement in select queries along with Where, Order By, and Group By clause. It can be used in the Insert statement as well.
…
Insert statement with CASE statement.

Value	Description	Required value in Employee table
1	Female Employee	F

How do you write a select query in a CASE statement?

How do I select conditional in SQL?

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

How do you write an if statement in a select query?

You can have two choices for this to actually implement:

Using IIF, which got introduced from SQL Server 2012: SELECT IIF ( (Obsolete = ‘N’ OR InStock = ‘Y’), 1, 0) AS Saleable, * FROM Product.
Using Select Case : SELECT CASE WHEN Obsolete = ‘N’ or InStock = ‘Y’ THEN 1 ELSE 0 END as Saleable, * FROM Product.

Which is faster case or IIf?

The CASE is slightly faster than IIF. IF is a control of flow statement; it indicates which T-SQL statement to evaluate next, based on a condition. CASE is a function — it simply returns a value.

Can I use IIf in SQL?

What are the 3 functions of a switch?

Three basic functins of a switch are Learning, Forwarding and Preventing Layer 2 Loops.

What is a switch formula?

Excel 2019. The SWITCH function compares one value against a list of values and returns a result that corresponds to the first match found. You can use the SWITCH function when you want to perform a “self-contained” exact match lookup with several possible results.

Can we use switch case in SQL?