Rules to Compare Two Values

If types of compared values are different, the relationship between the values is defined by type priority:

• NULL (lowest);
• Boolean;
• Number;
• Date;
• String;
• Reference types

The relationship between different reference types is defined based on table reference numbers corresponding to a specific type.

If data types are the same, their values are compared based on the following rules:

• the Boolean type TRUE value is greater than FALSE;
• the Number type has standard rules of number comparison;
• the Date type earlier dates are less than later dates;
• for the String type strings are compared according to the national database parameters;
• reference types are compared according to their values (record number, etc.).

See also:
                       Data Composition System Expression Language
                       Bilingual Presentation of Data Composition System Keywords