BOOLEAN data type


Informix supports the BOOLEAN data type, which can store 't' or 'f' values.

Genero BDL implements the BOOLEAN data type in a different way: A BOOLEAN variable stores integer values 1 or 0 (for TRUE or FALSE). This type is designed to hold the result of a boolean expression.


SAP® ASE provides the BIT data type to store boolean values.

However, unlike Informix types, BIT columns cannot be NULL and thus you must specify the NOT NULL constraint when creating the table.


The SAP ASE database interface converts BOOLEAN type to BIT columns and stores 1 or 0 values in the column.

You must explicitly specify the NOT NULL constraint in the CREATE TABLE statement.

The BOOLEAN type translation can be controlled with the following FGLPROFILE entry:
dbi.database.dsname.ifxemul.datatype.boolean = { true | false }
For more details see IBM Informix emulation parameters in FGLPROFILE.