Table constraints

Informix®

Informix supports primary key, unique, foreign key, default and check constraints.

The constraint naming syntax is different in Informix and most other databases: Informix expects the constraint name after the constraint definition:

CREATE TABLE emp (
  ...
  emp_code CHAR(10) UNIQUE CONSTRAINT pk_emp,
  ...
)

While other SQL database brands require to specify the constraint name before the constraint definition:

CREATE TABLE emp (
   ... 
   emp_code CHAR(10) CONSTRAINT pk_emp UNIQUE, 
   ...
)

SAP ASE

SAP® ASE supports primary key, unique, foreign key, default and check constraints.

Constraint naming

However, SAP ASE does not support a constraint naming clause.

Solution

The database interface does not convert constraint naming expressions when creating tables from BDL programs. Review the database creation scripts to adapt the constraint naming clauses for SAP ASE.