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MySQL - Make an existing Field Unique
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ALTER IGNORE TABLE mytbl ADD UNIQUE (columnName);
For MySQL 5.7.4 or later:
ALTER TABLE mytbl ADD UNIQUE (columnName);
As of MySQL 5.7.4, the IGNORE clause for ALTER TABLE is removed and
its use produces an error.
So, make sure to remove duplicate entries first as IGNORE keyword...
【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
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BLE是低功耗蓝牙的英文缩写（Bluetooth Low Energy），是蓝牙4.0版本起开始支持的新的、低功耗版本的蓝牙技术规范。蓝牙技术联盟（Bluetooth SIG）在2010年发布了跨时代的蓝牙4.0，它并不是蓝牙3.0的简单升级版本，而是全新的技术架...
Keep overflow div scrolled to bottom unless user scrolls up
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146
This might help you:
var element = document.getElementById("yourDivID");
element.scrollTop = e...
Convert a number range to another range, maintaining ratio
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edited May 11 '14 at 5:14
answered May 30 '09 at 5:52
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Problems with lib-icu dependency when installing Symfony 2.3.x via Composer
... aptitude install php5-intl // i.e. ubuntu
brew install icu4c // osx
check the extension is enabled and properly configured in php.ini aswell.
( hint: php-cli sometimes uses a different php.ini )
php.ini
extension=intl.so ; *nix
extension=php_...
Why doesn't JavaScript have a last method? [closed]
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TriptychTriptych
180k3131 gold badges140140 silver badges167167 bronze badges
20
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Get Substring between two characters using javascript
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453
You can try this
var mySubString = str.substring(
str.lastIndexOf(":") + 1,
str.last...
Laravel Eloquent groupBy() AND also return count of each group
...something like this: Total Records: 10; Internet Explorer 8: 2; Chrome 25: 4; Firefox 20: 4. (All adding up to 10)
10 Answe...
Can I get JSON to load into an OrderedDict?
... object_pairs_hook=OrderedDict)
>>> print json.dumps(data, indent=4)
{
"foo": 1,
"bar": 2
}
>>>
Using json.load is done in the same way:
>>> data = json.load(open('config.json'), object_pairs_hook=OrderedDict)
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What is the leading LINQ for JavaScript library? [closed]
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– Daniel Earwicker
Mar 23 '10 at 8:24
25
I hate that this is the accepted answer. Yeah, sure, it'...