Add documentation about the issues of casting MONEY to/from numeric

types.

diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml
index c67c6268556776714f30786abac2132272a11dc0..dccb88c8d87a0eb94e5e95bfb909be31e04ad92e 100644 (file)
--- a/doc/src/sgml/datatype.sgml
+++ b/doc/src/sgml/datatype.sgml
@@ -1,4 +1,4 @@
-
+
 
  
   Data Types
@@ -842,6 +842,14 @@ ALTER SEQUENCE tablename_
     floating-point literals, as well as typical
     currency formatting, such as '$1,000.00'.
     Output is generally in the latter form but depends on the locale.
+    Non-quoted numeric values can be converted to money by
+    casting the numeric value to text and then
+    money:
+
+SELECT 1234::text::money;
+
+    There is no simple way of doing the reverse;  casting a money value to a
+    numeric type.