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Improve Range Types and Exclusion Constraints example. 

Make the examples self-contained to avoid confusion. Per bug report
8367 from KOIZUMI Satoru.
This commit is contained in:
Jeff Davis 2013-09-04 23:30:27 -07:00
parent f5c2f5a8f6
commit be6fcb671e
1 changed files with 11 additions and 7 deletions
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18
doc/src/sgml/rangetypes.sgml
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@ -451,7 +451,10 @@ CREATE INDEX reservation_idx ON reservation USING gist (during);
range type. For example:
<programlisting>
ALTER TABLE reservation ADD EXCLUDE USING gist (during WITH &amp;&amp;);
CREATE TABLE reservation (
during tsrange,
EXCLUDE USING gist (during WITH &amp;&amp;)
);
</programlisting>
That constraint will prevent any overlapping values from existing
@ -459,14 +462,14 @@ ALTER TABLE reservation ADD EXCLUDE USING gist (during WITH &amp;&amp;);
<programlisting>
INSERT INTO reservation VALUES
(1108, '[2010-01-01 11:30, 2010-01-01 13:00)');
('[2010-01-01 11:30, 2010-01-01 15:00)');
INSERT 0 1
INSERT INTO reservation VALUES
(1108, '[2010-01-01 14:45, 2010-01-01 15:45)');
('[2010-01-01 14:45, 2010-01-01 15:45)');
ERROR: conflicting key value violates exclusion constraint "reservation_during_excl"
DETAIL: Key (during)=([ 2010-01-01 14:45:00, 2010-01-01 15:45:00 )) conflicts
with existing key (during)=([ 2010-01-01 14:30:00, 2010-01-01 15:30:00 )).
DETAIL: Key (during)=(["2010-01-01 14:45:00","2010-01-01 15:45:00")) conflicts
with existing key (during)=(["2010-01-01 11:30:00","2010-01-01 15:00:00")).
</programlisting>
</para>
@ -479,6 +482,7 @@ with existing key (during)=([ 2010-01-01 14:30:00, 2010-01-01 15:30:00 )).
are equal:
<programlisting>
CREATE EXTENSION btree_gist;
CREATE TABLE room_reservation (
room text,
during tsrange,
@ -492,8 +496,8 @@ INSERT 0 1
INSERT INTO room_reservation VALUES
('123A', '[2010-01-01 14:30, 2010-01-01 15:30)');
ERROR: conflicting key value violates exclusion constraint "room_reservation_room_during_excl"
DETAIL: Key (room, during)=(123A, [ 2010-01-01 14:30:00, 2010-01-01 15:30:00 )) conflicts with
existing key (room, during)=(123A, [ 2010-01-01 14:00:00, 2010-01-01 15:00:00 )).
DETAIL: Key (room, during)=(123A, ["2010-01-01 14:30:00","2010-01-01 15:30:00")) conflicts
with existing key (room, during)=(123A, ["2010-01-01 14:00:00","2010-01-01 15:00:00")).
INSERT INTO room_reservation VALUES
('123B', '[2010-01-01 14:30, 2010-01-01 15:30)');