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Date: Sat, 30 Jun 2012 09:42:42 +0000 (UTC)
From: "Lukas Eder (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
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Subject: [jira] [Created] (DERBY-5837) Add support for SQL standard DATE,
 TIME, TIMESTAMP literals
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Lukas Eder created DERBY-5837:
---------------------------------

             Summary: Add support for SQL standard DATE, TIME, TIMESTAMP literals
                 Key: DERBY-5837
                 URL: https://issues.apache.org/jira/browse/DERBY-5837
             Project: Derby
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 10.8.2.2
            Reporter: Lukas Eder
            Priority: Minor


The SQL standard 1992 specifies <datetime literals> as such:

         <datetime literal> ::=
                <date literal>
              | <time literal>
              | <timestamp literal>

         <date literal> ::=
              DATE <date string>

         <time literal> ::=
              TIME <time string>

         <timestamp literal> ::=
              TIMESTAMP <timestamp string>

         <date string> ::=
              <quote> <date value> <quote>

         <time string> ::=
              <quote> <time value> [ <time zone interval> ] <quote>

         <timestamp string> ::=
              <quote> <date value> <space> <time value> [ <time zone interval> ] <quote>

Taken from:
http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt

This seems not to be supported directly by Derby. Instead, Derby supports functions for constructing DATE, TIME, TIMESTAMP values. For example:
http://db.apache.org/derby/docs/dev/ref/rreftimestampfunc.html

For increased compatibility, it would be nice if literals were implemented according to the standard. In essence, the function's parentheses could be made optional

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