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1 | 1 | <!-- |
2 | | -$Header: /cvsroot/pgsql/doc/src/sgml/syntax.sgml,v 1.40 2001/02/24 18:09:51 petere Exp $ |
| 2 | +$Header: /cvsroot/pgsql/doc/src/sgml/syntax.sgml,v 1.41 2001/02/25 16:05:21 petere Exp $ |
3 | 3 | --> |
4 | 4 |
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5 | 5 | <chapter id="sql-syntax"> |
@@ -905,17 +905,17 @@ sqrt(2) |
905 | 905 | you will sometimes need to add parentheses when using combinations |
906 | 906 | of binary and unary operators. For instance |
907 | 907 | <programlisting> |
908 | | -SELECT 5 !+ 6; |
| 908 | +SELECT 5 !- 6; |
909 | 909 | </programlisting> |
910 | 910 | will be parsed as |
911 | 911 | <programlisting> |
912 | | -SELECT 5 ! (+ 6); |
| 912 | +SELECT 5 ! (- 6); |
913 | 913 | </programlisting> |
914 | 914 | because the parser has no idea -- until it is too late -- that |
915 | 915 | <token>!</token> is defined as a postfix operator, not an infix one. |
916 | 916 | To get the desired behavior in this case, you must write |
917 | 917 | <programlisting> |
918 | | -SELECT (5 !)+ 6; |
| 918 | +SELECT (5 !)- 6; |
919 | 919 | </programlisting> |
920 | 920 | This is the price one pays for extensibility. |
921 | 921 | </para> |
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