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Update MERGE docs to mention that ONLY is supported.
Commit 7103ebb7aa added support for MERGE, which included support for
inheritance hierarchies, but didn't document the fact that ONLY could
be specified before the source and/or target tables to exclude tables
inheriting from the tables specified.
Update merge.sgml to mention this, and while at it, add some
regression tests to cover it.
Dean Rasheed, reviewed by Nathan Bossart.
Backpatch to 15, where MERGE was added.
Discussion: https://postgr.es/m/CAEZATCU0XM-bJCvpJuVRU3UYNRqEBS6g4-zH%3Dj9Ye0caX8F6uQ%40mail.gmail.com
This commit is contained in:
Dean Rasheed
parent
07c29ca7fe
commit
5defdef8aa
@ -22,13 +22,13 @@ PostgreSQL documentation
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<refsynopsisdiv>
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<synopsis>
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[ WITH <replaceable class="parameter">with_query</replaceable> [, ...] ]
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MERGE INTO <replaceable class="parameter">target_table_name</replaceable> [ [ AS ] <replaceable class="parameter">target_alias</replaceable> ]
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MERGE INTO [ ONLY ] <replaceable class="parameter">target_table_name</replaceable> [ * ] [ [ AS ] <replaceable class="parameter">target_alias</replaceable> ]
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USING <replaceable class="parameter">data_source</replaceable> ON <replaceable class="parameter">join_condition</replaceable>
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<replaceable class="parameter">when_clause</replaceable> [...]
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<phrase>where <replaceable class="parameter">data_source</replaceable> is:</phrase>
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{ <replaceable class="parameter">source_table_name</replaceable> | ( <replaceable class="parameter">source_query</replaceable> ) } [ [ AS ] <replaceable class="parameter">source_alias</replaceable> ]
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{ [ ONLY ] <replaceable class="parameter">source_table_name</replaceable> [ * ] | ( <replaceable class="parameter">source_query</replaceable> ) } [ [ AS ] <replaceable class="parameter">source_alias</replaceable> ]
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<phrase>and <replaceable class="parameter">when_clause</replaceable> is:</phrase>
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@ -129,6 +129,14 @@ DELETE
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<listitem>
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<para>
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The name (optionally schema-qualified) of the target table to merge into.
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If <literal>ONLY</literal> is specified before the table name, matching
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rows are updated or deleted in the named table only. If
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<literal>ONLY</literal> is not specified, matching rows are also updated
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or deleted in any tables inheriting from the named table. Optionally,
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<literal>*</literal> can be specified after the table name to explicitly
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indicate that descendant tables are included. The
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<literal>ONLY</literal> keyword and <literal>*</literal> option do not
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affect insert actions, which always insert into the named table only.
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</para>
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</listitem>
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</varlistentry>
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@ -151,7 +159,12 @@ DELETE
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<listitem>
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<para>
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The name (optionally schema-qualified) of the source table, view, or
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transition table.
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transition table. If <literal>ONLY</literal> is specified before the
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table name, matching rows are included from the named table only. If
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<literal>ONLY</literal> is not specified, matching rows are also included
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from any tables inheriting from the named table. Optionally,
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<literal>*</literal> can be specified after the table name to explicitly
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indicate that descendant tables are included.
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</para>
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</listitem>
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</varlistentry>
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@ -1886,6 +1886,7 @@ CREATE TABLE measurement_y2007m01 (
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) WITH (autovacuum_enabled=off);
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ALTER TABLE measurement_y2007m01 DROP COLUMN filler;
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ALTER TABLE measurement_y2007m01 INHERIT measurement;
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INSERT INTO measurement VALUES (0, '2005-07-21', 5, 15);
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CREATE OR REPLACE FUNCTION measurement_insert_trigger()
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RETURNS TRIGGER AS $$
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BEGIN
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@ -1917,15 +1918,17 @@ INSERT INTO measurement VALUES (1, '2007-01-17', 10, 10);
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SELECT tableoid::regclass, * FROM measurement ORDER BY city_id, logdate;
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tableoid | city_id | logdate | peaktemp | unitsales
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----------------------+---------+------------+----------+-----------
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measurement | 0 | 07-21-2005 | 5 | 15
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measurement_y2006m02 | 1 | 02-10-2006 | 35 | 10
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measurement_y2006m02 | 1 | 02-16-2006 | 45 | 20
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measurement_y2006m03 | 1 | 03-17-2006 | 25 | 10
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measurement_y2006m03 | 1 | 03-27-2006 | 15 | 40
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measurement_y2007m01 | 1 | 01-15-2007 | 10 | 10
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measurement_y2007m01 | 1 | 01-17-2007 | 10 | 10
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(6 rows)
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(7 rows)
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CREATE TABLE new_measurement (LIKE measurement) WITH (autovacuum_enabled=off);
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INSERT INTO new_measurement VALUES (0, '2005-07-21', 25, 20);
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INSERT INTO new_measurement VALUES (1, '2006-03-01', 20, 10);
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INSERT INTO new_measurement VALUES (1, '2006-02-16', 50, 10);
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INSERT INTO new_measurement VALUES (2, '2006-02-10', 20, 20);
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@ -1933,6 +1936,37 @@ INSERT INTO new_measurement VALUES (1, '2006-03-27', NULL, NULL);
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INSERT INTO new_measurement VALUES (1, '2007-01-17', NULL, NULL);
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INSERT INTO new_measurement VALUES (1, '2007-01-15', 5, NULL);
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INSERT INTO new_measurement VALUES (1, '2007-01-16', 10, 10);
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BEGIN;
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MERGE INTO ONLY measurement m
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USING new_measurement nm ON
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(m.city_id = nm.city_id and m.logdate=nm.logdate)
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WHEN MATCHED AND nm.peaktemp IS NULL THEN DELETE
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WHEN MATCHED THEN UPDATE
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SET peaktemp = greatest(m.peaktemp, nm.peaktemp),
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unitsales = m.unitsales + coalesce(nm.unitsales, 0)
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WHEN NOT MATCHED THEN INSERT
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(city_id, logdate, peaktemp, unitsales)
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VALUES (city_id, logdate, peaktemp, unitsales);
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SELECT tableoid::regclass, * FROM measurement ORDER BY city_id, logdate, peaktemp;
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tableoid | city_id | logdate | peaktemp | unitsales
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----------------------+---------+------------+----------+-----------
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measurement | 0 | 07-21-2005 | 25 | 35
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measurement_y2006m02 | 1 | 02-10-2006 | 35 | 10
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measurement_y2006m02 | 1 | 02-16-2006 | 45 | 20
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measurement_y2006m02 | 1 | 02-16-2006 | 50 | 10
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measurement_y2006m03 | 1 | 03-01-2006 | 20 | 10
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measurement_y2006m03 | 1 | 03-17-2006 | 25 | 10
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measurement_y2006m03 | 1 | 03-27-2006 | 15 | 40
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measurement_y2006m03 | 1 | 03-27-2006 | |
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measurement_y2007m01 | 1 | 01-15-2007 | 5 |
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measurement_y2007m01 | 1 | 01-15-2007 | 10 | 10
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measurement_y2007m01 | 1 | 01-16-2007 | 10 | 10
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measurement_y2007m01 | 1 | 01-17-2007 | 10 | 10
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measurement_y2007m01 | 1 | 01-17-2007 | |
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measurement_y2006m02 | 2 | 02-10-2006 | 20 | 20
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(14 rows)
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ROLLBACK;
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MERGE into measurement m
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USING new_measurement nm ON
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(m.city_id = nm.city_id and m.logdate=nm.logdate)
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@ -1946,6 +1980,7 @@ WHEN NOT MATCHED THEN INSERT
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SELECT tableoid::regclass, * FROM measurement ORDER BY city_id, logdate;
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tableoid | city_id | logdate | peaktemp | unitsales
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----------------------+---------+------------+----------+-----------
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measurement | 0 | 07-21-2005 | 25 | 35
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measurement_y2006m02 | 1 | 02-10-2006 | 35 | 10
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measurement_y2006m02 | 1 | 02-16-2006 | 50 | 30
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measurement_y2006m03 | 1 | 03-01-2006 | 20 | 10
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@ -1953,8 +1988,37 @@ SELECT tableoid::regclass, * FROM measurement ORDER BY city_id, logdate;
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measurement_y2007m01 | 1 | 01-15-2007 | 10 | 10
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measurement_y2007m01 | 1 | 01-16-2007 | 10 | 10
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measurement_y2006m02 | 2 | 02-10-2006 | 20 | 20
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(8 rows)
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BEGIN;
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MERGE INTO new_measurement nm
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USING ONLY measurement m ON
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(nm.city_id = m.city_id and nm.logdate=m.logdate)
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WHEN MATCHED THEN DELETE;
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SELECT * FROM new_measurement ORDER BY city_id, logdate;
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city_id | logdate | peaktemp | unitsales
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---------+------------+----------+-----------
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1 | 02-16-2006 | 50 | 10
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1 | 03-01-2006 | 20 | 10
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1 | 03-27-2006 | |
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1 | 01-15-2007 | 5 |
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1 | 01-16-2007 | 10 | 10
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1 | 01-17-2007 | |
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2 | 02-10-2006 | 20 | 20
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(7 rows)
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ROLLBACK;
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MERGE INTO new_measurement nm
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USING measurement m ON
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(nm.city_id = m.city_id and nm.logdate=m.logdate)
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WHEN MATCHED THEN DELETE;
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SELECT * FROM new_measurement ORDER BY city_id, logdate;
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city_id | logdate | peaktemp | unitsales
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---------+------------+----------+-----------
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1 | 03-27-2006 | |
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1 | 01-17-2007 | |
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(2 rows)
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DROP TABLE measurement, new_measurement CASCADE;
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NOTICE: drop cascades to 3 other objects
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DETAIL: drop cascades to table measurement_y2006m02
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@ -1231,6 +1231,7 @@ CREATE TABLE measurement_y2007m01 (
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) WITH (autovacuum_enabled=off);
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ALTER TABLE measurement_y2007m01 DROP COLUMN filler;
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ALTER TABLE measurement_y2007m01 INHERIT measurement;
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INSERT INTO measurement VALUES (0, '2005-07-21', 5, 15);
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CREATE OR REPLACE FUNCTION measurement_insert_trigger()
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RETURNS TRIGGER AS $$
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@ -1264,6 +1265,7 @@ INSERT INTO measurement VALUES (1, '2007-01-17', 10, 10);
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SELECT tableoid::regclass, * FROM measurement ORDER BY city_id, logdate;
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CREATE TABLE new_measurement (LIKE measurement) WITH (autovacuum_enabled=off);
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INSERT INTO new_measurement VALUES (0, '2005-07-21', 25, 20);
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INSERT INTO new_measurement VALUES (1, '2006-03-01', 20, 10);
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INSERT INTO new_measurement VALUES (1, '2006-02-16', 50, 10);
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INSERT INTO new_measurement VALUES (2, '2006-02-10', 20, 20);
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@ -1272,6 +1274,21 @@ INSERT INTO new_measurement VALUES (1, '2007-01-17', NULL, NULL);
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INSERT INTO new_measurement VALUES (1, '2007-01-15', 5, NULL);
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INSERT INTO new_measurement VALUES (1, '2007-01-16', 10, 10);
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BEGIN;
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MERGE INTO ONLY measurement m
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USING new_measurement nm ON
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(m.city_id = nm.city_id and m.logdate=nm.logdate)
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WHEN MATCHED AND nm.peaktemp IS NULL THEN DELETE
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WHEN MATCHED THEN UPDATE
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SET peaktemp = greatest(m.peaktemp, nm.peaktemp),
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unitsales = m.unitsales + coalesce(nm.unitsales, 0)
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WHEN NOT MATCHED THEN INSERT
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(city_id, logdate, peaktemp, unitsales)
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VALUES (city_id, logdate, peaktemp, unitsales);
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SELECT tableoid::regclass, * FROM measurement ORDER BY city_id, logdate, peaktemp;
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ROLLBACK;
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MERGE into measurement m
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USING new_measurement nm ON
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(m.city_id = nm.city_id and m.logdate=nm.logdate)
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@ -1284,6 +1301,23 @@ WHEN NOT MATCHED THEN INSERT
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VALUES (city_id, logdate, peaktemp, unitsales);
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SELECT tableoid::regclass, * FROM measurement ORDER BY city_id, logdate;
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BEGIN;
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MERGE INTO new_measurement nm
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USING ONLY measurement m ON
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(nm.city_id = m.city_id and nm.logdate=m.logdate)
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WHEN MATCHED THEN DELETE;
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SELECT * FROM new_measurement ORDER BY city_id, logdate;
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ROLLBACK;
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MERGE INTO new_measurement nm
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USING measurement m ON
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(nm.city_id = m.city_id and nm.logdate=m.logdate)
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WHEN MATCHED THEN DELETE;
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SELECT * FROM new_measurement ORDER BY city_id, logdate;
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DROP TABLE measurement, new_measurement CASCADE;
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DROP FUNCTION measurement_insert_trigger();
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