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Using DISTINCT and COUNT together in a MySQL Query
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Select count(*), productid
from products
where keyword = '$keyword'
group by productid
that will give you a list like
count(*) productid
----------------------
5 12345
3 93884
9 93493
This allows you to see how many of each distinct productid ID...
Bad class file magic or version
...ava module
apply plugin: 'java'
Solution #1: Quick an dirty
I fixed it by setting my JAVA_HOME back to 1.7:
export JAVA_HOME=`/usr/libexec/java_home -v 1.7`
Solution #2: change compiler version:
change back to 1.7 for this specific module in its build.gradle
apply plugin: 'java'
sourceCompa...
How do I add a linker or compile flag in a CMake file?
... compile a simple "Hello, World!" program it compiles fine. When I test it by adding a simple exception handling in that code it works too (after adding -fexceptions .. I guess it is disabled by default).
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Differences between Line and Branch coverage
...n column header is clicked:
Line Coverage - The percent of lines executed by this test run.
Branch Coverage - The percent of branches executed by this test run.
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How should one go about choosing a default TCP/IP port for a new service?
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If all developers go by that logic it would mean that all new services gather around the few unassigned ports. What would the probability be that a service is running on an assigned port vs an unassigned port. (Sorry if I'm not exposing some tr...
When would you use a WeakHashMap or a WeakReference?
...WeakReference and a SoftReference.
Basically a WeakReference will be GC-d by the JVM eagerly, once the referenced object has no hard references to it. A SoftReferenced object on the other hand, will tend to be left about by the garbage collector until it really needs to reclaim the memory.
A cache...
Preventing scroll bars from being hidden for MacOS trackpad users in WebKit/Blink
...udo-elements [blog]. You can disable the default appearance and behaviour by setting -webkit-appearance [docs] to none.
Because you're removing the default style, you'll also need to specify the style yourself or the scroll bar will never show up. The following CSS recreates the appearance of the...
Why charset names are not constants?
Charset issues are confusing and complicated by themselves, but on top of that you have to remember exact names of your charsets. Is it "utf8" ? Or "utf-8" ? Or maybe "UTF-8" ? When searching internet for code samples you will see all of the above. Why not just make them named constants and use ...
What is the difference between window, screen, and document in Javascript?
...y name - so you do not have to write down window. - it will be figured out by the runtime.
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Easily measure elapsed time
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By the way, this measures CPU time, not wall clock time. Right?
– Nikos
Jan 22 '17 at 0:40
4
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