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What is the purpose of setting a key in data.table?
I am using data.table and there are many functions which require me to set a key (e.g. X[Y] ). As such, I wish to understand what a key does in order to properly set keys in my data tables.
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Export database schema into SQL file
Is it possible in MS SQL Server 2008 to export database structure into a T-SQL file?
4 Answers
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Clearing purchases from iOS in-app purchase sandbox for a test user
Does anyone have any ideas on how to reset and/or clear the iOS in-app purchase sandbox?
8 Answers
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Insert current date in datetime format mySQL
I'm having problems getting the date inserted properly into my database.
15 Answers
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Extracting numbers from vectors of strings
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How do CDI and EJB compare? interact?
I'm having a tough time understanding how the two interact and where the boundary between them lies. Do they overlap? Are there redundancies between them?
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Why should we NOT use sys.setdefaultencoding(“utf-8”) in a py script?
...py scripts which use this at the top of the script. In what cases one should use it?
4 Answers
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Can I use a min-height for table, tr or td?
I am trying to show some details of a receive in a table.
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Why does X[Y] join of data.tables not allow a full outer join, or a left join?
This is a bit of a philosophical question about data.table join syntax. I am finding more and more uses for data.tables, but still learning...
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REST API Token-based Authentication
I'm developing a REST API that requires authentication. Because the authentication itself occurs via an external webservice over HTTP, I reasoned that we would dispense tokens to avoid repeatedly calling the authentication service. Which brings me neatly to my first question:
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