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doc: Clarify CREATE TYPE ENUM documentation

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The documentation claimed that an enum type requires "one or more"
labels, but since 1fd9883ff4, zero labels are also allowed.

Reported-by: Lukas Eder <lukas.eder@gmail.com>
Bug: #15356
This commit is contained in:
Peter Eisentraut 2018-11-13 10:42:43 +01:00
parent 8af1511e9c
commit 390301ce63
1 changed files with 5 additions and 2 deletions
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doc/src/sgml/ref/create_type.sgml
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@ -117,9 +117,12 @@ CREATE TYPE <replaceable class="parameter">name</replaceable>
<para>
The second form of <command>CREATE TYPE</command> creates an enumerated
(enum) type, as described in <xref linkend="datatype-enum">.
Enum types take a list of one or more quoted labels, each of which
Enum types take a list of quoted labels, each of which
must be less than <symbol>NAMEDATALEN</symbol> bytes long (64 bytes in a
standard <productname>PostgreSQL</productname> build).
standard <productname>PostgreSQL</productname> build). (It is possible to
create an enumerated type with zero labels, but such a type cannot be used
to hold values before at least one label is added using <xref
linkend="sql-altertype">.)
</para>
</refsect2>