you will sometimes need to add parentheses when using combinations
of binary and unary operators. For instance
-SELECT 5 ! ~ 6;
+SELECT 5 ! + 6;
will be parsed as
-SELECT 5 ! (~ 6);
+SELECT 5 ! (+ 6);
- because the parser has no idea --- until it's too late --- that
- ! is defined as a postfix operator not an infix one.
+ because the parser has no idea -- until it is too late -- that
+ ! is defined as a postfix operator, not an infix one.
To get the desired behavior in this case, you must write
-SELECT (5 !) ~ 6;
+SELECT (5 !) + 6;
This is the price one pays for extensibility.