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How to find duplicates in 2 columns not 1
...e_id,
upcharge_title,
count(*)
from your_table
group by stone_id,
upcharge_title
having count(*) > 1
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Passing multiple error classes to ruby's rescue clause in a DRY fashion
I have some code that needs to rescue multiple types of exceptions in ruby:
3 Answers
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Most useful NLog configurations [closed]
...u great flexibility in the configuration of the loggers (control globally, by namespace, by specific logger name, etc).
Use non-classname-based loggers where appropriate. Maybe you have one function for which you really want to control the logging separately. Maybe you have some cross-cutting log...
How and why does 'a'['toUpperCase']() in JavaScript work?
...tring.prototype. Since this property references a method, we can invoke it by attaching ()
'a'['toUpperCase']();
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How can I replace a newline (\n) using sed?
...
You can run this cross-platform (i.e. on Mac OS X) by separately executing the commands rather than separating with semi-colons: sed -e ':a' -e 'N' -e '$!ba' -e 's/\n/ /g'
– Benjie
Sep 27 '11 at 11:16
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Find a value anywhere in a database
...: To search all columns of all tables for a given search string
-- Written by: Narayana Vyas Kondreddi
-- Site: http://vyaskn.tripod.com
-- Tested on: SQL Server 7.0 and SQL Server 2000
-- Date modified: 28th July 2002 22:50 GMT
DECLARE @Results TABLE(ColumnName nvarchar(370), ColumnValue nvarchar(...
What is the meaning of single and double underscore before an object name?
...bles and methods, without having to worry about instance variables defined by derived classes, or mucking with instance variables by code outside the class. Note that the mangling rules are designed mostly to avoid accidents; it still is possible for a determined soul to access or modify a variable ...
Deep cloning objects
...l other options are variations of those) and the best solution is provided by Pedro77's link on the question comments.
So I'll just copy relevant parts of those 2 references here. That way we can have:
The best thing to do for cloning objects in C sharp!
First and foremost, those are all our opti...
Is an index needed for a primary key in SQLite?
...Y columns aside, both UNIQUE and PRIMARY KEY
constraints are implemented by creating an index in the database (in
the same way as a "CREATE UNIQUE INDEX" statement would). Such an
index is used like any other index in the database to optimize
queries. As a result, there often no advantage (b...
How to simulate the environment cron executes a script with?
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Cron provides only this environment by default :
HOME user's home directory
LOGNAME user's login
PATH=/usr/bin:/usr/sbin
SHELL=/usr/bin/sh
If you need more you can source a script where you define your environment before the scheduling table in the crontab....