Eine Einführung in

SQL

CREATE TABLE problems: Foreign key references.

PostgreSQL
A foreign key should refer to a candidate key in some table. This is usually the primary key but may be a field (or list of fields) specified as UNIQUE.	Execute tidy up code silently DROP TABLE t_stupid CREATE TABLE t_stupid (a INTEGER ,FOREIGN KEY(a) REFERENCES cia(population))
Specific to PostgreSQL
none