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mysql update column with value from another table
...ableA ON tableB.name = tableA.name
SET tableB.value = IF(tableA.value > 0, tableA.value, tableB.value)
WHERE tableA.name = 'Joe'
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Python str vs unicode types
...de-point level. For example you can do:
>>> 'àèìòù'
'\xc3\xa0\xc3\xa8\xc3\xac\xc3\xb2\xc3\xb9'
>>> print 'àèìòù'.replace('\xa8', '')
à�ìòù
What before was valid UTF-8, isn't anymore. Using a unicode string you cannot operate in such a way that the resulting strin...
Spark java.lang.OutOfMemoryError: Java heap space
...uge amounts of data you may need way more than 4 per CPU, I've had to use 8000 partitions in some cases!
Decrease the fraction of memory reserved for caching, using spark.storage.memoryFraction. If you don't use cache() or persist in your code, this might as well be 0. It's default is 0.6, which me...
NSDate beginning of day and end of day
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edited Jan 10 '18 at 22:54
shim
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Official way to ask jQuery wait for all images to load before executing something
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Checking from shell script if a directory contains files
...ob # To include hidden files
files=(/some/dir/*)
if [ ${#files[@]} -gt 0 ]; then echo "huzzah"; fi
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How do I concatenate two strings in C?
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edited Jun 22 '18 at 9:00
Gaurang Tandon
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How to loop through all the properties of a class?
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answered Feb 10 '09 at 7:47
BrannonBrannon
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How do I find the install time and date of Windows?
...sion\InstallDate
It's given as the number of seconds since January 1, 1970. (Note: for Windows 10, this date will be when the last feature update was installed, not the original install date.)
To convert that number into a readable date/time just paste the decimal value in the field "UNIX TimeSta...