Helen Borrie wrote Wed, 27 Apr 2016 03:17:00 +0300:
Hello, Helen
I would like to say a few errors in the description of Operator Precedence.
Common Language Elements->Expressions->SQL Operators->Operator Precedence
1. Arithmetic Operators. Among the arithmetic operators of places without
unary plus (+) and minus (-). They have a higher priority than
multiplication and division.
Operator Purpose Precedence
--
+ Unary plus 1
- Unary minus 1
* Multiplication 2
/ Division2
+ Addition3
- Subtraction 3
2. Comparison Operators. All comparison operators have the same priority.
Since Firebird 3.0.1. predicate IS has a higher priority than the other
comparison operators. The Firebird 2.x predicate IS has the same priority
as other comparison operators.
Operators Priorities can be found in parse.y
// precedence declarations for expression evaluation
%left OR
%left AND
%left NOT
%left '=' '<' '>' BETWEEN LIKE CONTAINING STARTING SIMILAR KW_IN NEQ GEQ
LEQ NOT_GTR NOT_LSS
%left IS
%left '+' '-'
%left '*' '/'
%left UMINUS UPLUS
%left CONCATENATE
%left COLLATE
--
Cheers,
Simonov Denis
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