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SQL join on multiple columns in same tables
I have 2 subqueries, but I'm having trouble joining columns together from the same tables. I tried:
2 Answers
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jQuery select all except first
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edited May 23 '18 at 17:45
Jeromy French
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Preserve line endings
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edited Oct 12 '15 at 17:35
Joseph Thomson
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Xcode find caller functions
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126
Xcode 4.5 (in beta) has this functionality. when you highlight say... a function, you can check...
Display Animated GIF
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edited Apr 29 '17 at 12:20
hasen
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How to avoid .pyc files?
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291
From "What’s New in Python 2.6 - Interpreter Changes":
Python can now be prevented from
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Extract subset of key-value pairs from Python dictionary object?
...bigdict[k]) for k in ('l', 'm', 'n'))
... or in Python 3 Python versions 2.7 or later (thanks to Fábio Diniz for pointing that out that it works in 2.7 too):
{k: bigdict[k] for k in ('l', 'm', 'n')}
Update: As Håvard S points out, I'm assuming that you know the keys are going to be in the dic...
Java logical operator short-circuiting
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246
The && and || operators "short-circuit", meaning they don't evaluate the right-hand si...
Find the day of a week
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df = data.frame(date=c("2012-02-01", "2012-02-01", "2012-02-02"))
df$day <- weekdays(as.Date(df$date))
df
## date day
## 1 2012-02-01 Wednesday
## 2 2012-02-01 Wednesday
## 3 2012-02-02 Thursday
Edit: Just to show another way......