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Is there a REAL performance difference between INT and VARCHAR primary keys?
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Tamlyn
16.1k77 gold badges9090 silver badges114114 bronze badges
answered Dec 1 '08 at 21:47
Bill KarwinBill Karwin
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MySQL: Insert record if not exists in table
...tnames (name, address, tele)
SELECT * FROM (SELECT 'Rupert', 'Somewhere', '022') AS tmp
WHERE NOT EXISTS (
SELECT name FROM table_listnames WHERE name = 'Rupert'
) LIMIT 1;
Query OK, 1 row affected (0.00 sec)
Records: 1 Duplicates: 0 Warnings: 0
SELECT * FROM `table_listnames`;
+----+------...
Remove empty array elements
...e removed. So if you need to preserve elements that are i.e. exact string '0', you will need a custom callback:
// PHP 7.4 and later
print_r(array_filter($linksArray, fn($value) => !is_null($value) && $value !== ''));
// PHP 5.3 and later
print_r(array_filter($linksArray, function($valu...
UITableViewCell subview disappears when cell is selected
...enting a color-chooser table view where the user can select amongst, say, 10 colors (depends on the product). The user can also select other options (like hard drive capacity, ...).
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Is ASCII code 7-bit or 8-bit?
...told me ASCII is 8-bit character coding scheme. But it is defined only for 0-127 codes which means it can be fit into 7-bits. So can't it be argued that ASCII bit is actually 7-bit code?
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Get event listeners attached to node using addEventListener
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140
Chrome DevTools, Safari Inspector and Firebug support getEventListeners(node).
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How to sort an array of objects by multiple fields?
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30 Answers
30
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How does the following LINQ statement work?
...ist = new List<int>{1,2,4,5,6};
var even = list.Where(m => m%2 == 0).ToList();
list.Add(8);
foreach (var i in even)
{
Console.WriteLine(i);
}
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Unbalanced calls to begin/end appearance transitions for
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edited Oct 28 '19 at 10:43
answered Oct 25 '11 at 8:03
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How to TryParse for Enum value?
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answered Jul 4 '09 at 18:19
Victor Arndt MuellerVictor Arndt Mueller
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