Lukas Eder created DERBY-5893: --------------------------------- Summary: Add support for the SQL:2008 standard IS [ NOT ] DISTINCT FROM predicate Key: DERBY-5893 URL: https://issues.apache.org/jira/browse/DERBY-5893 Project: Derby Issue Type: Improvement Components: SQL Affects Versions: 10.9.1.0 Reporter: Lukas Eder Priority: Minor
The SQL:1999 standard specifies the IS [ NOT ] DISTINCT FROM predicate in chapter 8.15 <distinct predicate>: <distinct predicate> ::= <row value predicand 3> <distinct predicate part 2> <distinct predicate part 2> ::= IS [ NOT ] DISTINCT FROM <row value predicand 4> <row value predicand 3> ::= <row value predicand> <row value predicand 4> ::= <row value predicand> This predicate is supported by at least these databases: - http://www.postgresql.org/docs/9.1/static/functions-comparison.html - http://www.h2database.com/html/grammar.html#condition_right_hand_side - http://hsqldb.org/doc/guide/ch05.html#N11BB0 - http://dev.mysql.com/doc/refman/5.6/en/comparison-operators.html#operator_equal-to (with a different syntax) - http://dcx.sybase.com/1200/en/dbreference/is-distinct-from-search-condition.html It would probably make sense for the Derby database to implement it as well. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira