mirrors/postgres
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add a little to index operator class discussion.

Browse Source
This commit is contained in:
Tom Lane 2000-03-28 02:51:09 +00:00
parent 1f7ba1ebaf
commit f71fb9e0b8
1 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
doc/src/sgml/indices.sgml
View File

@ -110,9 +110,11 @@
integers. In practice the default operator class for the field's
datatype is usually sufficient. The main point of having operator classes
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 we wanted by selecting the proper operator class. There
are also some operator classes with special purposes:
ordering. For example, we might want to sort a complex-number datatype
either by absolute value or by real part. We could do this by defining
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>
<listitem>