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 CONSTRAINTS 

Using the system table CONSTRAINTS, you can determine the following database information, among other things:

All conditions of the columns of table CUSTOMER that represent explicit value checks
SELECT definition
  FROM DOMAIN.CONSTRAINTS
    WHERE tablename = 'CUSTOMER'

Constraints (integrity conditions) that relate to NOT NULL definitions, primary keys, UNIQUE definitions or referential constrains are not found with this SELECT statement.

NOT-NULL columns: see COLUMNS

Primary keys: see COLUMNS

UNIQUE columns: see INDEXES

Referential constraint: see FOREIGNKEYS

Columns in a referential constraint: see FOREIGNKEYCOLUMNS

Constraint of a domain: see DOMAINCONSTRAINTS

 

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