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Add an example of attaching a default value to an updatable view.

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This is probably the single most useful thing that ALTER VIEW can do,
particularly now that we have auto-updatable views.  So show an explicit
example.
This commit is contained in:
Tom Lane 2013-02-09 11:43:48 -05:00
parent 0343a59d11
commit 3a1f8cdfa9
1 changed files with 13 additions and 1 deletions
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14
doc/src/sgml/ref/alter_view.sgml
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@ -154,7 +154,19 @@ ALTER VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable> RESET
<literal>bar</literal>:
<programlisting>
ALTER VIEW foo RENAME TO bar;
</programlisting></para>
</programlisting>
</para>
<para>
To attach a default column value to an updatable view:
<programlisting>
CREATE TABLE base_table (id int, ts timestamptz);
CREATE VIEW a_view AS SELECT * FROM base_table;
ALTER VIEW a_view ALTER COLUMN ts SET DEFAULT now();
INSERT INTO base_table(id) VALUES(1); -- ts will receive a NULL
INSERT INTO a_view(id) VALUES(2); -- ts will receive the current time
</programlisting>
</para>
</refsect1>
<refsect1>