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Using union and order by clause in mysql
...rting by your other criteria, e.g.:
select *
from (
select 1 as Rank, id, add_date from Table
union all
select 2 as Rank, id, add_date from Table where distance < 5
union all
select 3 as Rank, id, add_date from Table where distance between 5 and 15
) a
order by rank, id, add...
what is reverse() in Django
...s to it in your code. This violates DRY (Don't Repeat Yourself), the whole idea of editing one place only, which is something to strive for.
Instead, you can say:
from django.urls import reverse
return HttpResponseRedirect(reverse('url_name'))
This looks through all urls defined in your project ...
How to implement a queue using two stacks?
...
Keep 2 stacks, let's call them inbox and outbox.
Enqueue:
Push the new element onto inbox
Dequeue:
If outbox is empty, refill it by popping each element from inbox and pushing it onto outbox
Pop and return the top element from outbox
Using this method, each element will be in each stac...
How to test which port MySQL is running on and whether it can be connected to?
...Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1393/sshd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1859/master
tcp 0 0 123.189...
Why can't I access DateTime->date in PHP's DateTime class?
...e::format() you can access the property using reflection:
<?php
$dt = new DateTime();
$o = new ReflectionObject($dt);
$p = $o->getProperty('date');
$date = $p->getValue($dt);
This is slight faster than using format() because format() formats a timestring that has already been formatted....
How to get primary key column in Oracle?
... column in oracle which is called test and then query
create table test
(
id int,
name varchar2(20),
city varchar2(20),
phone int,
constraint pk_id_name_city primary key (id,name,city)
);
SELECT cols.table_name, cols.column_name, cols.position, cons.status, cons.owner FROM all_constraints cons, al...
How to merge a list of lists with same type of items to a single list of items?
...
Do you mean this?
var listOfList = new List<List<int>>() {
new List<int>() { 1, 2 },
new List<int>() { 3, 4 },
new List<int>() { 5, 6 }
};
var list = new List<int> { 9, 9, 9 };
var result = list.Concat(listOfList...
How to open existing project in Eclipse
...
Try File > New > Project... > Android Project From Existing Code.
Don't copy your project from pc into workspace, copy it elsewhere and let the eclipse copy it into workspace by menu commands above and checking copy in existing wo...
Why does sed not replace all occurrences?
...unction () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f15849119%2fwhy-does-sed-not-replace-all-occurrences%23new-answer', 'question_page');
}
);
...
How can I default a parameter to Guid.Empty in C#?
...
Solution
You can use new Guid() instead
public void Problem(Guid optional = new Guid())
{
// when called without parameters this will be true
var guidIsEmpty = optional == Guid.Empty;
}
You can also use default(Guid)
default(Guid) also wi...