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How to get first character of a string in SQL?
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LEFT(colName, 1) will also do this, also. It's equivalent to SUBSTRING(colName, 1, 1).
I like LEFT, since I find it a bit cleaner, but really, there's no difference either way.
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SQL: capitalize first letter only [duplicate]
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Are you asking for renaming column itself or capitalise the data inside column? If its data yo...
Rotating a two-dimensional array in Python
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Consider the following two-dimensional list:
original = [[1, 2],
[3, 4]]
Lets break it down step by step:
>>> original[::-1] # elements of original are reversed
[[3, 4], [1, 2]]
This list is passed into zip() using argument unpacking, so the zip call ends...
How do I use floating-point division in bash?
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18 Answers
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Convert a row of a data frame to vector
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156
When you extract a single row from a data frame you get a one-row data frame. Convert it to a...
Decreasing for loops in Python impossible?
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for n in range(6,0,-1):
print n
# prints [6, 5, 4, 3, 2, 1]
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Differences between Oracle JDK and OpenJDK
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11 Answers
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Creating dataframe from a dictionary where entries have different lengths
Say I have a dictionary with 10 key-value pairs. Each entry holds a numpy array. However, the length of the array is not the same for all of them.
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How to profile a bash shell script slow startup?
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If you have GNU date (or another version that can output nanoseconds), do this at the beginnin...