How Will You Create a Table With Boolean Data Type in SQL Server?


Heather Bennett

In SQL Server, creating a table with a boolean data type is slightly different compared to other data types. The boolean data type is not directly supported in SQL Server; however, we can simulate it using other data types and constraints.

Simulating Boolean Data Type

To simulate a boolean data type, we can use the bit data type. The bit data type represents a binary value of either 0 or 1, where 0 represents false and 1 represents true.

To create a table with a boolean column, follow these steps:

Step 1: Create the Table

Start by creating the table with the desired column name:

    MyBooleanColumn bit

Step 2: Add Check Constraint

Add a check constraint to limit the possible values of the column to either 0 or 1:

ADD CONSTRAINT CHK_MyTable_MyBooleanColumn 
CHECK (MyBooleanColumn IN (0,1));

This constraint ensures that only valid boolean values are allowed in the column. Any attempt to insert an invalid value will result in an error.

Step 3: Insert Data

You can now insert data into your table. To insert a boolean value, use either 0 or 1:

INSERT INTO MyTable (MyBooleanColumn)
VALUES (1); -- Represents true

INSERT INTO MyTable (MyBooleanColumn)
VALUES (0); -- Represents false


In SQL Server, we can simulate a boolean data type using the bit data type and adding a check constraint to restrict the values to 0 or 1. This allows us to work with boolean values in our tables effectively.

Remember to always use the appropriate data types and constraints to ensure data integrity and accurate representation of your data.

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