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What is causing ERROR: there is no unique constraint matching given keys for referenced table?
...ble structure gives an ERROR: there is no unique constraint matching given keys for referenced table, and having stared at it for while now I can't figure out why this error arises in this situation.
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Fast way of finding lines in one file that are not in another?
...e-format="" file1 file2
The input files should be sorted for this to work. With bash (and zsh) you can sort in-place with process substitution <( ):
diff --new-line-format="" --unchanged-line-format="" <(sort file1) <(sort file2)
In the above new and unchanged lines are suppressed, s...
How to check existence of user-define table type in SQL Server 2008?
I have a user-defined table type. I want to check it's existence before editing in a patch using OBJECT_ID(name, type) function.
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Insert current date in datetime format mySQL
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If you're looking to store the current time just use MYSQL's functions.
mysql_query("INSERT INTO `table` (`dateposted`) VALUES (now())");
If you need to use PHP to do it, the format it Y-m-d H:i:s so try
$date = date('Y-m-d H:i:s');
m...
Format / Suppress Scientific Notation from Python Pandas Aggregation Results
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Granted, the answer I linked in the comments is not very helpful. You can specify your own string converter like so.
In [25]: pd.set_option('display.float_format', lambda x: '%.3f' % x)
In [28]: Series(np.random.randn(3))*1000000000
Out[28]:
0 ...
What is the difference between a definition and a declaration?
...inition actually instantiates/implements this identifier. It's what the linker needs in order to link references to those entities. These are definitions corresponding to the above declarations:
int bar;
int g(int lhs, int rhs) {return lhs*rhs;}
double f(int i, double d) {return i+d;}
class foo {}...
DialogFragment setCancelable property not working
I am working in an android application and am using a DialogFragment to show a dialog and I want to make that DialogFragment not cancelable. I have made the dialog cancelable property to false, but still its not affecting.
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How to show popup message like in Stack Overflow
I would like to add a popup message like the one that appears on Stack Overflow when I am not logged in and I try to use voting buttons.
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How to duplicate a git repository? (without forking)
...ls from the first one. The copy and the mother repository should not be linked together.
5 Answers
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Javascript: How to check if a string is empty? [duplicate]
I know this is really basic, but I am new to javascript and can't find an answer anywhere.
5 Answers
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