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22 Frequently Asked Questions (FAQ) for PostgreSQL
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4- Last updated: Wed Apr 18 23:05:05 EDT 2007
4+ Last updated: Fri Apr 20 09:48:11 EDT 2007
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66 Current maintainer: Bruce Momjian (bruce@momjian.us)
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630630 upper and lowercase characters, it can not have identical values that
631631 differ only in case. To force a particular case to be stored in the
632632 column, use a CHECK constraint or a trigger.
633- 4.9) In a query, how do I detect if a field is NULL? How do I
634- concatenate possible NULLs? How can I sort on whether a field is NULL
635- or not?
636633
637634 4.9) In a query, how do I detect if a field is NULL? How do I concatenate
638635 possible NULLs? How can I sort on whether a field is NULL or not?
Original file line number Diff line number Diff line change 1010 alink ="#0000ff ">
1111 < H1 > Frequently Asked Questions (FAQ) for PostgreSQL</ H1 >
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13- < P > Last updated: Wed Apr 18 23:05:05 EDT 2007</ P >
13+ < P > Last updated: Fri Apr 20 09:48:11 EDT 2007</ P >
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1515 < P > Current maintainer: Bruce Momjian (< A href =
1616 "mailto:bruce@momjian.us "> bruce@momjian.us</ A > )
@@ -823,10 +823,6 @@ <H3 id="item4.8">4.8) How do I perform regular expression
823823 case to be stored in the column, use a < SMALL > CHECK</ SMALL >
824824 constraint or a trigger.</ P >
825825
826- < A href ="#item4.9 "> 4.9</ A > ) In a query, how do I detect if a field
827- is < SMALL > NULL</ SMALL > ? How do I concatenate possible < SMALL > NULL</ SMALL > s?
828- How can I sort on whether a field is < SMALL > NULL</ SMALL > or not?< BR >
829-
830826 < H3 id ="item4.9 "> 4.9) In a query, how do I detect if a field
831827 is < SMALL > NULL</ SMALL > ? How do I concatenate possible < SMALL > NULL</ SMALL > s?
832828 How can I sort on whether a field is < SMALL > NULL</ SMALL > or not?</ H3 >
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