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| author | Peter Eisentraut <peter_e@gmx.net> | 2001-02-25 16:05:21 +0000 |
|---|---|---|
| committer | Peter Eisentraut <peter_e@gmx.net> | 2001-02-25 16:05:21 +0000 |
| commit | 60774e821060dd6d6395504d4ccda107d2a71a42 (patch) | |
| tree | 89213f4d8f19edc962eb943ff89b12c9269518c3 | |
| parent | 2a398726e7685392615725acfc93920e8965318e (diff) | |
| download | postgresql-60774e821060dd6d6395504d4ccda107d2a71a42.tar.gz postgresql-60774e821060dd6d6395504d4ccda107d2a71a42.zip | |
Even better example for operator precedence mis-parsing.
| -rw-r--r-- | doc/src/sgml/syntax.sgml | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/doc/src/sgml/syntax.sgml b/doc/src/sgml/syntax.sgml index 181d113a415..1e95caa637c 100644 --- a/doc/src/sgml/syntax.sgml +++ b/doc/src/sgml/syntax.sgml @@ -1,5 +1,5 @@ <!-- -$Header: /cvsroot/pgsql/doc/src/sgml/syntax.sgml,v 1.40 2001/02/24 18:09:51 petere Exp $ +$Header: /cvsroot/pgsql/doc/src/sgml/syntax.sgml,v 1.41 2001/02/25 16:05:21 petere Exp $ --> <chapter id="sql-syntax"> @@ -905,17 +905,17 @@ sqrt(2) you will sometimes need to add parentheses when using combinations of binary and unary operators. For instance <programlisting> -SELECT 5 ! + 6; +SELECT 5 ! - 6; </programlisting> will be parsed as <programlisting> -SELECT 5 ! (+ 6); +SELECT 5 ! (- 6); </programlisting> because the parser has no idea -- until it is too late -- that <token>!</token> is defined as a postfix operator, not an infix one. To get the desired behavior in this case, you must write <programlisting> -SELECT (5 !) + 6; +SELECT (5 !) - 6; </programlisting> This is the price one pays for extensibility. </para> |