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SQL to find the number of distinct values in a column
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count(*) includes nulls
– PragmaticProgrammer
Jul 12 '17 at 17:05
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When should one use HTML entities?
...ad clients that don't understand encodings correctly. I don't believe that includes any current browsers, but you never know what other kinds of programs might be hitting you up.
More useful, though, is that HTML entities protect you from your own errors: if you misconfigure something on the server...
Counting array elements in Python [duplicate]
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Edited to include numpy import
– user2993689
Jul 19 '19 at 4:47
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an htop-like tool to display disk activity in linux [closed]
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Use collectl which has extensive process I/O monitoring including monitoring threads.
Be warned that there are I/O counters for I/O being written to cache and I/O going to disk. collectl reports them separately. If you're not careful you can misinterpret the data. See http://co...
How can I check if a string represents an int, without using try/except?
...hink.
EDIT:
I've updated the code above to work in Python 3.5, and to include the check_int function from the currently most voted up answer, and to use the current most popular regex that I can find for testing for integer-hood. This regex rejects strings like 'abc 123'. I've added 'abc 123' a...
Are PDO prepared statements sufficient to prevent SQL injection?
...njection means data has been cycled through the database once before being included in a query, and is much harder to pull off. AFAIK, you almost never see real engineered 2nd order attacks, as it is usually easier for attackers to social-engineer their way in, but you sometimes have 2nd order bugs...
Where does Oracle SQL Developer store connections?
...ase? I would have thought the connections.xml file will have the details including passwords.
– AM_86
Jan 7 at 16:39
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What is the most efficient way to deep clone an object in JavaScript?
...deep flag is set to false (shallow clone). It is a good option, because it includes some extra logic for type validation and doesn't copy over undefined properties, etc., but this will also slow you down a little.
If you know the structure of the objects you are trying to clone or can avoid deep ne...
How to test an Android Library Project
...main difference is that the library and its dependencies are automatically included as dependencies of the test APK. This means that the test APK includes not only its own code, but also the library's AAR and all its dependencies. Because there is no separate "app under test," the androidTest task i...
Missing styles. Is the correct theme chosen for this layout?
...olutions available to solve this problem but nothing seems to work. I have included library in the manifest file. I even created style is styles.xml, I have chosen Google Apis build target as well.
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