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Why use multiple columns as primary keys (composite primary key)
...nerated (non-intelligent) primary key, for example in this case OrderDetailId. But then you would not always see the relationship as easily. Some folks prefer one way; some prefer the other way.
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Rails 3 execute custom sql query without a model
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FWIW, Using empty params is not idiomatic ruby. So do connection.execute rather than connection().execute
– radixhound
Nov 14 '13 at 3:38
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What is Ruby equivalent of Python's `s= “hello, %s. Where is %s?” % (“John”,“Mary”)`
...into the language). Yeah, it's an array ("list" in Python should really be called arrays...).
– user395760
Aug 24 '10 at 7:41
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The constant cannot be marked static
... @BasheerAL-MOMANI: No. A final is just unchangeable after the constructor call. Nothing more.
– juergen d
Oct 25 '16 at 10:09
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How to drop rows of Pandas DataFrame whose value in a certain column is NaN
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This question is already resolved, but...
...also consider the solution suggested by Wouter in his original comment. The ability to handle missing data, including dropna(), is built into pandas explicitly. Aside from potentially improved performance over doing it manually, these...
How to write an XPath query to match two attributes?
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//div[@id='..' and @class='...]
should do the trick. That's selecting the div operators that have both attributes of the required value.
It's worth using one of the online XPath testbeds to try stuff out.
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How to get the process ID to kill a nohup process?
...task in the background, the background operator (&) will give you the PID at the command prompt. If your plan is to manually manage the process, you can save that PID and use it later to kill the process if needed, via kill PID or kill -9 PID (if you need to force kill). Alternatively, you can f...
How to get the index of an element in an IEnumerable?
... +1 for "questioning the wisdom". 9 times out of 10 it's probably a bad idea in the first place.
– Joel Coehoorn
Aug 17 '09 at 21:45
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Bash: If/Else statement in one line
I am trying to check if a process (assume it is called some_process ) is running on a server. If it is, then echo 1, otherwise echo 0.
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How to leave a message for a github.com user
...te with a github.com user i.e. write the user a message when only username/id is given on their GitHub page? Does GitHub have this social feature?
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