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

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