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Running a cron job at 2:30 AM everyday
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541
crontab -e
add:
30 2 * * * /your/command
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Why does the C# compiler go mad on this nested LINQ query?
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40
I believe that it's related to type inference and/or lambda generation (when type inference has...
What is `git diff --patience` for?
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answered Oct 28 '10 at 16:34
Mark RushakoffMark Rushakoff
214k3737 gold badges383383 silver badges383383 bronze badges
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SQLite INSERT - ON DUPLICATE KEY UPDATE (UPSERT)
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Since 3.24.0 SQLite also supports upsert, so now you can simply write the following
INSERT INTO visits (ip, hits)
VALUES ('127.0.0.1', 1)
ON CONFLICT(ip) DO UPDATE SET hits = hits + 1;
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Fill between two vertical lines in matplotlib
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For example, let's use axvspan to highlight the x-region between 8 and 14:
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
ax.plot(range(20))
ax.axvspan(8, 14, alpha=0.5, color='red')
plt.show()
You could use fill_betweenx to do this, but the extents (both x and y) of the rectangl...
How to check if field is null or empty in MySQL?
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194
Either use
SELECT IF(field1 IS NULL or field1 = '', 'empty', field1) as field1
from tablename
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Get distance between two points in canvas
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answered Jan 4 '14 at 4:41
Igor ŠarčevićIgor Šarčević
2,85311 gold badge1414 silver badges1818 bronze badges
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What does glLoadIdentity() do in OpenGL?
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edited Jun 4 '12 at 7:39
Nasreddine
32.4k1717 gold badges7070 silver badges9191 bronze badges
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