doc: Clarify CREATE TYPE ENUM documentation

The documentation claimed that an enum type requires "one or more"
labels, but since 1fd9883ff49, zero labels are also allowed.

Reported-by: Lukas Eder 
Bug: #15356

diff --git a/doc/src/sgml/ref/create_type.sgml b/doc/src/sgml/ref/create_type.sgml
index fa9b520b241953ddd6c91de6b011547f26383aca..175315f3d7e456332a2b9c667773727e2d3e5f46 100644 (file)
--- a/doc/src/sgml/ref/create_type.sgml
+++ b/doc/src/sgml/ref/create_type.sgml
@@ -117,9 +117,12 @@ CREATE TYPE name
    
     The second form of CREATE TYPE creates an enumerated
     (enum) type, as described in .
-    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 NAMEDATALEN bytes long (64 bytes in a
-    standard PostgreSQL build).
+    standard PostgreSQL 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 
+    linkend="sql-altertype"/>.)