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From "Bernt M. Johnsen (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-2167) Slightly misleading error message for UNIQUE constraint without NUT NULL constraint
Date Tue, 12 Dec 2006 10:05:21 GMT
Slightly misleading error message for UNIQUE constraint without NUT NULL constraint
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                 Key: DERBY-2167
                 URL: http://issues.apache.org/jira/browse/DERBY-2167
             Project: Derby
          Issue Type: Bug
          Components: Miscellaneous
            Reporter: Bernt M. Johnsen
            Priority: Trivial


With UNIQUE contraint, you get an error message which indicates you also need explicit NOT
NULL constraint for PRIMARY KEY constraint, which is not true . NOT NULL is implicit for PRIMARY
KEY (or more precise according to the lingo in the SQL standard: PRIMARY KEY is an alternative
syntax for UNIQUE NOT NULL)

ij> create table t1 (i integer unique);
ERROR 42831: 'I' cannot be a column of a primary key or unique key because it can contain
null values.
ij> create table t2 (i integer unique not null);
0 rows inserted/updated/deleted
ij> create table t3 (i integer primary key);
0 rows inserted/updated/deleted
ij> create table t4 (i integer primary key not null);
0 rows inserted/updated/deleted


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