Reference Manual
   CHAPTER 7. SQL Data Types     

Bit data type

Function 

For storing Boolean values.

Syntax 

BIT

Usage 

By default, columns of BIT data type do not allow NULL. This behavior is different from other data types. You can explicitly allow NULL if desired.

Standards and compatibility 

• SQL/92     Vendor extension.

• Sybase     Monetary data types in Adaptive Server Anywhere are implemented as user-defined data types, and are primarily intended for compatibility with Adaptive Server Enterprise.