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Full Discussion: pass value from Oracle sql to Korn shell
Top Forums Programming pass value from Oracle sql to Korn shell Post 302706213 by DGPickett on Wednesday 26th of September 2012 10:16:57 AM
Old 09-26-2012
Usually MAX() or the like is a good way to ensure there is only one row out, but rownum=1 might be cheaper and OK if there is only one value. On one hand, MAX() folds all the rows together inside the engine, but rownum=1 allows a cursor to be created and filled, then discards each following row one by one at the presentation side. There are sample functions cheaper than max(), which evaluates every row, like FIRST_VALUE(), but it might insist on a sort: FIRST_VALUE but doc says OVER() can be empty: SQL Functions
or FIRST (also needs a sort): FIRST
Hint for first rows 1 helps: Comments

On a no-problem day, the sqlplus options pile is a fine way to return just the value, but on those other days, often including day 1 as you debug, for errors it is a bit of a train wreck. The sed and dAtA...eNdAtA approach works portably on all SQL tools, and saves the informative stuff to a log file for production support and debug.
 

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LEARN ABOUT OSX

httppower

httppower(8)							     powerman							      httppower(8)

NAME

       httppower - communicate with HTTP based power distribution units

SYNOPSIS

       httppower [--url URL]

DESCRIPTION

       httppower  is  a  helper program for powerman which enables it to communicate with HTTP based power distribution units.	It is run interac-
       tively by the powerman daemon.

OPTIONS

       -u, --url URL
	      Set the base URL.

INTERACTIVE COMMANDS

       The following commands are accepted at the httppower> prompt:

       auth user:pass
	      Authenticate to the base URL with specified user and password, using ``basic'' HTTP authentication which sends the user and password
	      over the network in plain text.

       seturl URL
	      Set the base URL.  Overrides the command line option.

       get [URL-suffix]
	      Send an HTTP GET to the base URL with the optional URL-suffix appended.

       post [URL-suffix] key=val[&key=val]...
	      Send an HTTP POST to the base URL with the optional URL-suffix appended, and key-value pairs as argument.

FILES

       /usr/sbin/httppower
       /etc/powerman/powerman.conf

ORIGIN

       PowerMan was originally developed by Andrew Uselton on LLNL's Linux clusters.  This software is open source and distributed under the terms
       of the GNU GPL.

SEE ALSO

       powerman(1), powermand(8), httppower(8), plmpower(8), vpcd(8), powerman.conf(5), powerman.dev(5), powerman-devices(7).

       http://sourceforge.net/projects/powerman

powerman-2.3.5							    2009-02-09							      httppower(8)
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