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Full Discussion: Aggregation of huge data
Top Forums Shell Programming and Scripting Aggregation of huge data Post 302896110 by Corona688 on Friday 4th of April 2014 11:44:57 AM
Old 04-04-2014
The other thing to keep in mind is that awk uses floating point numbers. It's not infinite precision. If you print that number to 13 extra decimal places, most of those decimals will be meaningless garbage.

If you want a perfect sum, bc should do the job, if you convert the output into something it can use.

Code:
awk 'BEGIN { print "Z = 0;" } { sub(/-/, ""); print "Z += ",$1,";" } END { print "Z;" }' inputfile | bc

This prints "z = 0;" as the first line, then all lines afterwards as "z += number;" And the final line as "z;" to print the final sum.
 

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DROP 
AGGREGATE(7) PostgreSQL 9.2.7 Documentation DROP AGGREGATE(7) NAME
DROP_AGGREGATE - remove an aggregate function SYNOPSIS
DROP AGGREGATE [ IF EXISTS ] name ( argtype [ , ... ] ) [ CASCADE | RESTRICT ] DESCRIPTION
DROP AGGREGATE removes an existing aggregate function. To execute this command the current user must be the owner of the aggregate function. PARAMETERS
IF EXISTS Do not throw an error if the aggregate does not exist. A notice is issued in this case. name The name (optionally schema-qualified) of an existing aggregate function. argtype An input data type on which the aggregate function operates. To reference a zero-argument aggregate function, write * in place of the list of input data types. CASCADE Automatically drop objects that depend on the aggregate function. RESTRICT Refuse to drop the aggregate function if any objects depend on it. This is the default. EXAMPLES
To remove the aggregate function myavg for type integer: DROP AGGREGATE myavg(integer); COMPATIBILITY
There is no DROP AGGREGATE statement in the SQL standard. SEE ALSO
ALTER AGGREGATE (ALTER_AGGREGATE(7)), CREATE AGGREGATE (CREATE_AGGREGATE(7)) PostgreSQL 9.2.7 2014-02-17 DROP AGGREGATE(7)
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