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docs: add JSONB containment example of a key and empty object 

Backpatch through 9.5
This commit is contained in:
Bruce Momjian 2015-10-07 10:30:54 -04:00
parent 23d29cef93
commit b292ee79a6
1 changed files with 4 additions and 1 deletions
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5
doc/src/sgml/json.sgml
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@ -280,7 +280,7 @@ SELECT '[1, 2, 3]'::jsonb @> '[1, 2, 2]'::jsonb;
-- The object with a single pair on the right side is contained
-- within the object on the left side:
SELECT '{"product": "PostgreSQL", "version": 9.4, "jsonb":true}'::jsonb @> '{"version":9.4}'::jsonb;
SELECT '{"product": "PostgreSQL", "version": 9.4, "jsonb": true}'::jsonb @> '{"version": 9.4}'::jsonb;
-- The array on the right side is <emphasis>not</> considered contained within the
-- array on the left, even though a similar array is nested within it:
@ -291,6 +291,9 @@ SELECT '[1, 2, [1, 3]]'::jsonb @&gt; '[[1, 3]]'::jsonb;
-- Similarly, containment is not reported here:
SELECT '{"foo": {"bar": "baz"}}'::jsonb @&gt; '{"bar": "baz"}'::jsonb; -- yields false
-- A top-level key and an empty object is contained:
SELECT '{"foo": {"bar": "baz"}}'::jsonb @&gt; '{"foo": {}}'::jsonb;
</programlisting>
<para>