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Best way to select random rows PostgreSQL
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And a linked article of depez outlining several more approaches:
http://www.depesz.com/index.php/2007/09/16/my-thoughts-on-getting-random-row/
1 "large" as in "the complete table will not fit into the memory".
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how to provide a swap function for my class?
...ms a swap, it uses the equivalent of using std::swap; swap(t, u);.
swap (www.cplusplus.com):
Many components of the standard library (within std) call swap in an unqualified manner to allow custom overloads for non-fundamental types to be called instead of this generic version: Custom overload...
vs vs for inline and block code snippets
...is current, and has much more control if you wish.
– www-0av-Com
Mar 19 '18 at 20:20
@user1863152 - it's a very bad us...
class
...y. It has a Singleton Module just as an FYI.
This is pretty good.
https://www.youtube.com/watch?v=i4uiyWA8eFk
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How to upgrade PostgreSQL from version 9.6 to version 10.1 without losing data?
.../repos/apt/ utopic-pgdg main
Follow below commands
wget -q -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update
sudo apt-get install postgresql-9.4
sudo pg_dropcluster --stop 9.4 main
sudo /etc/init.d/postgresql start
Now we have everything, just nee...
What's the point of having pointers in Go?
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I really like example taken from http://www.golang-book.com/8
func zero(x int) {
x = 0
}
func main() {
x := 5
zero(x)
fmt.Println(x) // x is still 5
}
as contrasted with
func zero(xPtr *int) {
*xPtr = 0
}
func main() {
x := 5
zero(&a...
SOAP or REST for Web Services? [closed]
...ST approach would make the developers build this custom plumbing.
http://www.infoq.com/articles/rest-soap-when-to-use-each
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How to get a pixel's x,y coordinate color from an image?
... > 0 ? "NOT_TRANSPARENT" : "TRANSPARENT"));
}
<script src="https://www.marvinj.org/releases/marvinj-0.7.js"></script>
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Why declare unicode by string in python?
...er '\x81' in file C:\ex.py on line 1, but no
encoding declared; see http://www.python.org/peps/pep-0263.html for details
Output of file with # coding: cp437 added:
über '\x81ber'
über u'\xfcber'
At first, Python didn't know the encoding and complained about the non-ASCII character. Once it k...
Gson custom seralizer for one variable (of many) in an object using TypeAdapter
...son/annotations/JsonAdapter.html
The page has been moved to here: https://www.javadoc.io/doc/com.google.code.gson/gson/latest/com.google.gson/com/google/gson/annotations/JsonAdapter.html
Example:
private static final class Gadget {
@JsonAdapter(UserJsonAdapter2.class)
final User user;
G...