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How can I get the intersection, union, and subset of arrays in Ruby?
...et operations on arrays by doing &(intersection), -(difference), and |(union).
Obviously I didn't implement the MultiSet to spec, but this should get you started:
class MultiSet
attr_accessor :set
def initialize(set)
@set = set
end
# intersection
def &(other)
@set & o...
Remote Connections Mysql Ubuntu
For some reason, I've been unable to connect remotely to my MySQL server. I've tried everything and I'm still getting errors.
...
How to run Django's test database only in memory?
...s line: 'ENGINE': 'sqlite3' if 'test' in sys.argv else 'django.db.backends.mysql',
– mjallday
Jan 19 '11 at 6:26
3
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Remove duplicate rows in MySQL
...ate temporary table tmpTable (id int);
insert into tmpTable
(id)
select id
from YourTable yt
where exists
(
select *
from YourTabe yt2
where yt2.title = yt.title
and yt2.company = yt.company
and yt2.site_id = yt.si...
对外网用户的squid代理+认证 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
jiulongproxynew# make install
2、安装Apache，squid认证用户设置密码时使用apache的密码管理程序htpasswd
jiulongproxynew# cd /usr/ports/www/apache13
jiulongproxynew# make install
3、下载并安装squid
从http://www.squid-cache.org/Versions/v2/2.6/下载squid-2.6.STABLE1...
How to find Unused Amazon EC2 Security groups
...
If you select all of your security groups in the EC2 console, then press actions -> Delete Security Groups, a popup will appear telling you that you cannot delete security groups that are attached to instances, other security gro...
Difference between CTE and SubQuery?
...
CTE's are most useful for recursion:
WITH hier(cnt) AS (
SELECT 1
UNION ALL
SELECT cnt + 1
FROM hier
WHERE cnt < @n
)
SELECT cnt
FROM hier
will return @n rows (up to 101). Useful for calendars, dummy rowsets etc.
They are als...
MySQL Error 1153 - Got a packet bigger than 'max_allowed_packet' bytes
I'm importing a MySQL dump and getting the following error.
14 Answers
14
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SQL: deleting tables with prefix
...r you:
In the MySQL shell or through PHPMyAdmin, use the following query
SELECT CONCAT( 'DROP TABLE ', GROUP_CONCAT(table_name) , ';' )
AS statement FROM information_schema.tables
WHERE table_name LIKE 'myprefix_%';
This will generate a DROP statement which you can than copy and execut...
In MySQL, can I copy one row to insert into the same table?
...e) but I want to do this without having to list all the columns after the "select", because this table has too many columns.
...