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doc/FAQ
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doc/FAQ
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Frequently Asked Questions (FAQ) for PostgreSQL
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Last updated: Wed Apr 18 23:05:05 EDT 2007
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Last updated: Fri Apr 20 09:48:11 EDT 2007
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Current maintainer: Bruce Momjian (bruce@momjian.us)
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upper and lowercase characters, it can not have identical values that
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differ only in case. To force a particular case to be stored in the
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column, use a CHECK constraint or a trigger.
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4.9) In a query, how do I detect if a field is NULL? How do I
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concatenate possible NULLs? How can I sort on whether a field is NULL
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or not?
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4.9) In a query, how do I detect if a field is NULL? How do I concatenate
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possible NULLs? How can I sort on whether a field is NULL or not?
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alink="#0000ff">
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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
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<P>Last updated: Wed Apr 18 23:05:05 EDT 2007</P>
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<P>Last updated: Fri Apr 20 09:48:11 EDT 2007</P>
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<P>Current maintainer: Bruce Momjian (<A href=
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"mailto:bruce@momjian.us">bruce@momjian.us</A>)
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@ -823,10 +823,6 @@ table?</TD><TD>unlimited</TD></TR>
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case to be stored in the column, use a <SMALL>CHECK</SMALL>
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constraint or a trigger.</P>
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<A href="#item4.9">4.9</A>) In a query, how do I detect if a field
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is <SMALL>NULL</SMALL>? How do I concatenate possible <SMALL>NULL</SMALL>s?
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How can I sort on whether a field is <SMALL> NULL</SMALL> or not?<BR>
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<H3 id="item4.9">4.9) In a query, how do I detect if a field
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is <SMALL>NULL</SMALL>? How do I concatenate possible <SMALL>NULL</SMALL>s?
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How can I sort on whether a field is <SMALL> NULL</SMALL> or not?</H3>
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