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Top Forums Shell Programming and Scripting Newbie question: modulo operator with negative operand, bug or feature? Post 302951889 by drl on Tuesday 11th of August 2015 12:00:12 PM
Old 08-11-2015
Hi.

Quote:
In computing, the modulo operation finds the remainder after division of one number by another (sometimes called modulus).

Given two positive numbers, a (the dividend) and n (the divisor), a modulo n (abbreviated as a mod n) is the remainder of the Euclidean division of a by n.
..
When either a or n is negative, the naive definition breaks down and programming languages differ in how these values are defined.
-- https://en.wikipedia.org/wiki/Modulo_operation

Best wishes ... cheers, drl
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ALTER 
OPERATOR(7) PostgreSQL 9.2.7 Documentation ALTER OPERATOR(7) NAME
ALTER_OPERATOR - change the definition of an operator SYNOPSIS
ALTER OPERATOR name ( { left_type | NONE } , { right_type | NONE } ) OWNER TO new_owner ALTER OPERATOR name ( { left_type | NONE } , { right_type | NONE } ) SET SCHEMA new_schema DESCRIPTION
ALTER OPERATOR changes the definition of an operator. The only currently available functionality is to change the owner of the operator. You must own the operator to use ALTER OPERATOR. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have CREATE privilege on the operator's schema. (These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the operator. However, a superuser can alter ownership of any operator anyway.) PARAMETERS
name The name (optionally schema-qualified) of an existing operator. left_type The data type of the operator's left operand; write NONE if the operator has no left operand. right_type The data type of the operator's right operand; write NONE if the operator has no right operand. new_owner The new owner of the operator. new_schema The new schema for the operator. EXAMPLES
Change the owner of a custom operator a @@ b for type text: ALTER OPERATOR @@ (text, text) OWNER TO joe; COMPATIBILITY
There is no ALTER OPERATOR statement in the SQL standard. SEE ALSO
CREATE OPERATOR (CREATE_OPERATOR(7)), DROP OPERATOR (DROP_OPERATOR(7)) PostgreSQL 9.2.7 2014-02-17 ALTER OPERATOR(7)
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