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Add a little to index operator class discussion.

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Tom Lane
2000-03-28 02:51:09 +00:00
parent 1f7ba1ebaf
commit f71fb9e0b8
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doc/src/sgml/indices.sgml
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@ -110,9 +110,11 @@
integers. In practice the default operator class for the field's integers. In practice the default operator class for the field's
datatype is usually sufficient. The main point of having operator classes datatype is usually sufficient. The main point of having operator classes
is that for some datatypes, there could be more than one meaningful is that for some datatypes, there could be more than one meaningful
ordering. For an index on such a datatype, we could select which ordering. For example, we might want to sort a complex-number datatype
ordering we wanted by selecting the proper operator class. There either by absolute value or by real part. We could do this by defining
are also some operator classes with special purposes: two operator classes for the datatype and then selecting the proper
class when making an index. There are also some operator classes with
special purposes:
<itemizedlist> <itemizedlist>
<listitem> <listitem>