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Opposite of %in%: exclude rows with values specified in a vector
...y operators can be used as operators. and operators are either built-in or start and end with %. To create an operator, you need to assign a function with two operands to a name starting and ending with %.
– flying sheep
Mar 15 '19 at 16:41
...
Select mySQL based only on month and year
...an index on the Date column.
<?php
$date = $_POST['period'];
$start = strtotime($date);
$end = strtotime($date . ' 1 month - 1 second');
$query = sprintf(
'SELECT *
FROM projects
WHERE Date BETWEEN FROM_UNIXTIME(%u) AND FROM_UNIXTIME(%u)',
...
How to detect when an Android app goes to the background and come back to the foreground
...he foreground again. However, they are also called when the application is started for the first time and before it is killed. You can read more in Activity.
There isn't any direct approach to get the application status while in the background or foreground, but even I have faced this issue and fou...
Is there an advantage to use a Synchronized Method instead of a Synchronized Block?
... of synchronized methods on the same object to interleave"
// Start the thread
thread.start();
thread2.start();
}
public synchronized void increment() {
System.out.println("Begin thread " + Thread.currentThread().getName());
System.out.println(t...
Javascript Equivalent to PHP Explode()
...where 0 is the first
//Since we skipped the first element in the array, we start at 1
var myvar = myarr[1] + ":" + myarr[2];
// Show the resulting value
console.log(myvar);
// 'TEMP:data'
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How to declare variable and use it in the same Oracle SQL script?
...you want to declare date and then use it in SQL Developer.
DEFINE PROPp_START_DT = TO_DATE('01-SEP-1999')
SELECT *
FROM proposal
WHERE prop_start_dt = &PROPp_START_DT
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Is non-blocking I/O really faster than multi-threaded blocking I/O? How?
...or I/O operations to complete. As soon as an asynchronous I/O operation is started, it releases the thread on which it was launched and a callback is registered. When the operation completes, the callback is queued for execution on the first available thread.
If the I/O operation is executed synchr...
What's the best way of scraping data from a website? [closed]
...
You will definitely want to start with a good web scraping framework. Later on you may decide that they are too limiting and you can put together your own stack of libraries but without a lot of scraping experience your design will be much worse than pj...
When to use a linked list over an array/array list?
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Good start, but this leaves out important things: lists support structure sharing, arrays are denser and have better locality.
– Darius Bacon
Dec 26 '08 at 8:26
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Why is semicolon allowed in this python snippet?
...
@Cucu You're right. You also can't start a line with a semicolon, or start an expression list with a comma. So it's more accurate to say that semicolons and commas are separators and optional terminators.
– wjandrea
Jun 2...