mastertime | Timer management library
kandi X-RAY | mastertime Summary
kandi X-RAY | mastertime Summary
It allows you to create timers by writing very few JavaScript code.
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QUESTION
I'm probably overlooking a simple data issue, but I have trouble getting the results what I need when merging dataframes. Working from the documentation as listed here I would expect all the values from the key column to be present in the merged result with NaN values if the key value isn't present in one of the dataframes;
If a key combination does not appear in either the left or right tables, the values in the joined table will be NA
However, I'm only getting values for keys that are present in both dataframes for my data. I'm using outer and also tried left (left being the dataframe with more values in the key column). When I try it with sample data (created for this question) it somehow seems to work!
...ANSWER
Answered 2018-Nov-01 at 14:30I feel quite stupid, but it had to do with the sorting. It was working as expected all along, but I failed to properly sort the merged dataframe on 'Time' and therefor the rows for the Time values that weren't in the initial frame weren't showing when printing the merged dataframe. Sorting the merged frame in print showed the expected output
QUESTION
Suppose the PostgreSQL table structure looks like the following:
...ANSWER
Answered 2017-May-01 at 15:45SQL cannot grow the number of columns after the query has been parsed and prepared. You can't make more columns appear based on the distinct values it discovers during execution. This means you need to hard-code the columns when you design the query.
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