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What is causing ERROR: there is no unique constraint matching given keys for referenced table?
...table, so in your bar table you must have a unique (name) index.
See also http://www.postgresql.org/docs/9.1/static/ddl-constraints.html#DDL-CONSTRAINTS-FK and specifically:
Finally, we should mention that a foreign key must reference columns
that either are a primary key or form a unique con...
How do I print debug messages in the Google Chrome JavaScript Console?
How do I print debug messages in the Google Chrome JavaScript Console?
14 Answers
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What's the Best Way to Shuffle an NSMutableArray?
If you have an NSMutableArray , how do you shuffle the elements randomly?
12 Answers
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what is the difference between GROUP BY and ORDER BY in sql
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How to best display in Terminal a MySQL SELECT returning too many fields?
I'm using PuTTY to run:
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How to make overlay control above all other controls?
...the control to be put on top a higher ZIndex.
From MSDN:
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" WindowTitle="ZIndex Sample">
<Canvas>
<Rectangle Canvas.ZIndex="3" Width="100" Height="100" Canvas.Top="100" Canvas.Left="100" Fill="blue"/>
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When should use Readonly and Get only properties
...ulation posts series of Mark Seemann about properties and backing fields:
http://blog.ploeh.dk/2011/05/24/PokayokeDesignFromSmellToFragrance.aspx
taken from Mark's example:
public class Fragrance : IFragrance
{
private readonly string name;
public Fragrance(string name)
{
if ...
How to set variables in HIVE scripts
I'm looking for the SQL equivalent of SET varname = value in Hive QL
9 Answers
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Fixing “Lock wait timeout exceeded; try restarting transaction” for a 'stuck" Mysql table?
From a script I sent a query like this thousands of times to my local database:
13 Answers
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How to embed a video into GitHub README.md?
Is it possible to embed a flash video into README.md on GitHub? It isn't showing up: https://github.com/mattdipasquale/PicSciP
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