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      <h1>Appendix</h1>
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      <p><a href="#formats">Valid Formats</a></p>
      <p><a href="Supported%20Datatypes.htm#date">Date Data Types</a></p>
      <p class="line">&nbsp;</p>
      <p><a href="Appendix.htm">Appendix</a></p>
      <p><a href="Cardinality.htm">Cardinality</a></p>
      <p><a href="Date%20Formats.htm">Date Formats</a></p>
      <p><a href="Environment%20Variables.htm">Environment Variables</a></p>
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      <h2>Date Formats</h2>
      <p>The FORMAT clause of the COLUMN section in the Omnidex Environment file 
        applies to Omnidex Date class data types only. This includes OMNIDEX DATE, 
        OMNIDEX DATETIME and OMNIDEX TIME data types.</p>
      <p>In the INTERNAL section of the COLUMN section, this refers to the actual 
        data stored in the database, in which case, this is only applicable to 
        flat file databases. This only applies when the data type of the actual 
        data stored in the database is an Omnidex Date class data type, which 
        usually only occurs in flat file databases.<br>
        If the data type of the actual data in the database is an Omnidex Date 
        class data type, use this clause to indicate the granularity of the data. 
        For example, if the data type is OMNIDEX DATE and only the year and month 
        are stored in the database, the format_spec would be: YYYYMM or YYMM.</p>
      <p>In the OMNIDEX section of the COLUMN section, this refers to what is 
        stored in the index files.<br>
        No matter what the data type of the database date data is, the Omnidex 
        indexes store only Omnidex Date class data. Use the FORMAT format_spec 
        clause to define the granularity of the data stored in the index files. 
        For example, if the database data type is ORACLE DATETIME but you only 
        want to search on the date, there is no need to store the time portion 
        in the indexes. </p>
      <p>The default format_spec is: YYYYMMDD</p>
      <p><img src="../images/note.gif" width="12" height="15"><strong>This clause 
        DOES NOT affect the appearance of returned data. </strong></p>
      <p>DISC recommends that you do not index more granularity than is actually 
        needed for the application. For example, in applications that will qualify 
        records based on years, months, or even days, but never on time of day, 
        it is not necessary and not recommended that the time data be indexed. 
        The time data is not lost, it is simply not stored in the Omnidex indexes.</p>
      <p class="line">&nbsp;</p>
      <h3><a name="formats"></a>Valid Formats</h3>
      <p>Date formats are based on the following:</p>
      <h4>YYYYMMDDHHNNSSFF</h4>
      <p class="indent"> <span class="ex">YYYY</span><br>
        long year - 1941, 2005</p>
      <p class="indent"> <span class="ex">YY</span><br>
        short year - 41, 05</p>
      <p class="indent"> <span class="ex">MM</span><br>
        month from 01 to 12 - June = 06</p>
      <p class="indent"> <span class="ex">DD</span><br>
        day from 01 to 31</p>
      <p class="indent"> <span class="ex">HH</span><br>
        hour from 00 to 23<br>
        00 for midnight<br>
        06 for 6 am<br>
        14 for 2 pm</p>
      <p class="indent"> <span class="ex">NN</span><br>
        minute from 00 to 59</p>
      <p class="indent"> <span class="ex">SS</span><br>
        second from 00 to 59</p>
      <p class="indent"> <span class="ex">FF</span><br>
        fraction of a second from 0.01 to 0.99<br>
      </p>
      <p> </p>
      <p>Date formats can can be any of the following:</p>
      <p class="ex">YYYY <br>
        YYYYMM <br>
        YYYYMMDD <br>
        YYYYMMDDHH <br>
        YYYYMMDDHHNN <br>
        YYYYMMDDHHNNSS <br>
        YYYYMMDDHHNNSSFF <br>
        YY <br>
        YYMM <br>
        YYMMDD <br>
        YYMMDDHH <br>
        YYMMDDHHNN <br>
        YYMMDDHHNNSS <br>
        YYMMDDHHNNSSFF <br>
        MM <br>
        MMDD <br>
        MMDDHH <br>
        MMDDHHNN <br>
        MMDDHHNNSS <br>
        MMDDHHNNSSFF <br>
        DD <br>
        DDHH <br>
        DDHHNN <br>
        DDHHNNSS <br>
        DDHHNNSSFF <br>
        HH <br>
        HHNN <br>
        HHNNSS <br>
        HHNNSSFF <br>
        NN <br>
        NNSS <br>
        NNSSFF <br>
        SS <br>
        SSFF <br>
        FF</p>
      <p>&nbsp;</p>
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