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How to remove duplicate values from an array in PHP
...
if you want get unique AND duplicated items...
$unique=array("","A1","","A2","","A1","");
$duplicated=array();
foreach($unique as $k=>$v) {
if( ($kt=array_search($v,$unique))!==false and $k!=$kt )
{ unset($unique[$kt]); $duplicated[]=$v; }
}
sort($unique); // optional
sort($duplicated); /...
How to find gaps in sequential numbering in mysql?
... next_id, (b - a) -1 AS missing_inbetween
FROM
(
SELECT a1.id AS a , MIN(a2.id) AS b
FROM arrc_vouchers AS a1
LEFT JOIN arrc_vouchers AS a2 ON a2.id > a1.id
WHERE a1.id <= 100
GROUP BY a1.id
) AS tab
WHERE
b > a + 1
This will give you a table showing the id that has ids missing abov...
How do I perform the SQL Join equivalent in MongoDB?
...: 'orlando', last: 'becerra' },
age: 27
},
{
_id: 'a2',
name: { first: 'mayra', last: 'sanchez' },
age: 21
}
]);
.- Categories:
db.categories.insert([
{
_id: 'c1',
name: 'sci-fi'
},
{
_id: 'c2',
name: 'romance...
PHP function overloading
...tion(string '.$key.')', __function__);
// Get a reference
$a2 =& Overloadable::refAccess($key); // $a2 =& $GLOBALS['val'];
$a2 *= 3; // change the reference value
}
}
//----------------------------------------------------------
// Some data to work with:
$val ...
Return empty cell from formula in Excel
...elf annihilating formula. Put in cell, say B2, the following formula:
=IF(A2=0,GetTrueBlank,A2)
The above formula in B2 will evaluate to trueblank, if you type 0 in A2.
You can download a demonstration file here.
In the example above, evaluating formula to trueblank results in an empty cell. C...
parseInt vs unary plus, when to use which?
...
sahil
3,11011 gold badge1616 silver badges3737 bronze badges
answered Jun 14 '13 at 10:46
JosephJoseph
...
Detect 7 inch and 10 inch tablet programmatically
...he liberty to fix that.
– Jonik
Dec 11 '13 at 9:46
21
...
Get top n records for each group of grouped results
...VALUES('Laura',2,39);
SELECT a.* FROM mytable AS a
LEFT JOIN mytable AS a2
ON a.groupname = a2.groupname AND a.age <= a2.age
GROUP BY a.person
HAVING COUNT(*) <= 2
ORDER BY a.groupname, a.age DESC;
gives me:
a.person a.groupname a.age
---------- ----------- ----------
Sha...
Logical operators for boolean indexing in Pandas
...; import numpy as np
>>> a1 = np.array([0, 0, 1, 1])
>>> a2 = np.array([0, 1, 0, 1])
>>> np.logical_and(a1, a2)
array([False, False, False, True])
>>> np.bitwise_and(a1, a2)
array([0, 0, 0, 1], dtype=int32)
And since NumPy (and similarly pandas) does different...
What does the function then() mean in JavaScript?
...
|
edited Apr 11 '16 at 16:40
Grant Birchmeier
15.1k1111 gold badges5151 silver badges8080 bronze badges
...