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check if variable is dataframe
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Bash conditionals: how to “and” expressions? (if [ ! -z $VAR && -e $VAR ])
...-a.
– Charles Duffy
Jun 1 '16 at 21:27
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I found another one excellent and detailed explanation -...
How to join NSArray elements into an NSString?
...merBJ Homer
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Creating a directory in CMake
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squareskittles
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answered Oct 13 '16 at 12:25
Yevhenii BabichenkoYevhenii Babiche...
Django select only rows with duplicate field values
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John Mee
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Why can lambdas be better optimized by the compiler than plain functions?
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jcoderjcoder
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@try - catch block in Objective-C
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emacs create new file with ido enabled
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Which gets priority, maxRequestLength or maxAllowedContentLength?
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How do I ALTER a PostgreSQL table and make a column unique?
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I figured it out from the PostgreSQL docs, the exact syntax is:
ALTER TABLE the_table ADD CON...