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Full Discussion: File operator command
Top Forums Shell Programming and Scripting File operator command Post 302946764 by Scrutinizer on Friday 12th of June 2015 01:33:21 AM
Old 06-12-2015
Yes, but it is a different command altogether, in fact [[..]] is part of the shell syntax, whereas [ .. ] is not and using a regular test command with single brackets would not work properly in this case. Even if the -n operators happen to have a similar meaning, better advise would be to use the man page of the shell..
 

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DROP 
OPERATOR(7) SQL Commands DROP OPERATOR(7) NAME
DROP OPERATOR - remove an operator SYNOPSIS
DROP OPERATOR [ IF EXISTS ] name ( { lefttype | NONE } , { righttype | NONE } ) [ CASCADE | RESTRICT ] DESCRIPTION
DROP OPERATOR drops an existing operator from the database system. To execute this command you must be the owner of the operator. PARAMETERS
IF EXISTS Do not throw an error if the operator does not exist. A notice is issued in this case. name The name (optionally schema-qualified) of an existing operator. lefttype The data type of the operator's left operand; write NONE if the operator has no left operand. righttype The data type of the operator's right operand; write NONE if the operator has no right operand. CASCADE Automatically drop objects that depend on the operator. RESTRICT Refuse to drop the operator if any objects depend on it. This is the default. EXAMPLES
Remove the power operator a^b for type integer: DROP OPERATOR ^ (integer, integer); Remove the left unary bitwise complement operator ~b for type bit: DROP OPERATOR ~ (none, bit); Remove the right unary factorial operator x! for type bigint: DROP OPERATOR ! (bigint, none); COMPATIBILITY
There is no DROP OPERATOR statement in the SQL standard. SEE ALSO
CREATE OPERATOR [create_operator(7)], ALTER OPERATOR [alter_operator(7)] SQL - Language Statements 2010-05-14 DROP OPERATOR(7)
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