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##### Asked by: Denia Dieck

technology and computing databases# What is Boolean SQL?

Last Updated: 21st May, 2020

**boolean**is a data type that can store either a True or False value. This is often stored as 1 (true) or 0 (false). It's named after George Boole who first defined an algebraic system of logic in the 19th century.

**Boolean**values are common in programming languages, but do they exist in

**SQL**?

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Similarly, what is Boolean SQL Server?

There is **boolean** data type in **SQL Server**. Its values can be TRUE , FALSE or UNKNOWN . However, the **boolean** data type is only the result of a **boolean** expression containing some combination of comparison operators (e.g. = , <> , < , >= ) or logical operators (e.g. AND , OR , IN , EXISTS ).

Beside above, what is an example of a Boolean? A **Boolean** variable has only two possible values: true or false. It is common to use Booleans with control statements to determine the flow of a program. In this **example**, when the **boolean** value "x" is true, vertical black lines are drawn and when the **boolean** value "x" is false, horizontal gray lines are drawn.

Likewise, people ask, does SQL have Boolean?

**SQL** server **does** not **have** a real **boolean** datatype (which would be named **bool** or **boolean** ). In order to store **boolean** like values in **SQL** Server, the bit datatype **is** needed. It **can** assume the three values 0 , 1 and null .

What is Boolean true or false?

In computer science, the **Boolean** data type is a data type that has one of two possible values (usually denoted **true** and **false**) which is intended to represent the two **truth** values of logic and **Boolean** algebra. It is named after George Boole, who first defined an algebraic system of logic in the mid 19th century.