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MySQL SELECT only not null values
...comparison operators = and <> both give UNKNOWN with NULL on either side of the expression.)
SELECT *
FROM table
WHERE YourColumn IS NOT NULL;
Just for completeness I'll mention that in MySQL you can also negate the null safe equality operator but this is not standard SQL.
SELECT *
FROM ...
What is “lifting” in Haskell?
...ive
instance Applicative Foo where
pure x = Foo $ ... -- Wrap 'x' inside a Foo.
(<*>) = liftFoo2 ($)
The (<*>) operator for Foo has the type
(<*>) :: Foo (a -> b) -> Foo a -> Foo b
It applies the wrapped function to the wrapped value. So if you can implement ...
What is an Endpoint?
...rder to obtain an unauthorized Request Token from the server / service provider.
Resource Owner Authorization URI (called the User Authorization URL in the OAuth 1.0a community spec). This is a URI that you direct the user to to authorize a Request Token obtained from the Temporary Credential Reque...
Get cursor position (in characters) within a text Input field
...
What is the idea of "oField.focus()"? It works for me without this line. Be careful if you use blur event on your input and execute that function inside a callback.
– Kirill Reznikov
Sep 14 '15 at ...
Resize fields in Django Admin
... is a real waste of space, when, i.e., editing a date field, 8 characters wide, or a CharField, also 6 or 8 chars wide, and then the edit box goes up to 15 or 20 chars.
...
Restricting input to textbox: allowing only numbers and decimal point
...->
</SCRIPT>
</HEAD>
<BODY>
<INPUT id="txtChar" onkeypress="return isNumberKey(event)"
type="text" name="txtChar">
</BODY>
</HTML>
This really works!
...
Spring MVC type conversion : PropertyEditor or Converter?
...ing reference and write a converter instead(for eg, to convert from a Long id to an entity say, as a sample).
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What's the fastest way to do a bulk insert into Postgres?
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PostgreSQL has a guide on how to best populate a database initially, and they suggest using the COPY command for bulk loading rows. The guide has some other good tips on how to speed up the process, like removing indexes and foreign keys befor...
How to use ng-repeat for dictionaries in AngularJs?
...ame}}: {{age}}</li>
See ngRepeat documentation. Example: http://jsfiddle.net/WRtqV/1/
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Best practice to run Linux service as a different user
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On Debian we use the start-stop-daemon utility, which handles pid-files, changing the user, putting the daemon into background and much more.
I'm not familiar with RedHat, but the daemon utility that you are already using (which is defined in /etc/init.d/functions, btw.) is mentioned ev...