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In my local development Ubuntu box I use MySQL and phpmyadmin to work with the database.
24 Answers
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What's the difference between MyISAM and InnoDB? [duplicate]
...c engines you asked about (InnoDB and MyISAM) have different design goals. MySQL also has other storage engines, with their own design goals.
So, in choosing between InnoDB and MyISAM, the first step is in determining if you need the features provided by InnoDB. If not, then MyISAM is up for conside...
What resources exist for Database performance-tuning? [closed]
...er to a not-the-same-inquiry is probably a good start.
Hidden Features of MySQL
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How can I convert bigint (UNIX timestamp) to datetime in SQL Server?
...our code must match the casing! Another point could be that your System is MySql, than the name is date_add(). Regards ;)
– Nightking
Feb 11 '17 at 10:15
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Why does MYSQL higher LIMIT offset slow the query down?
...30
) q
JOIN mytable t
ON t.id = q.id
See this article:
MySQL ORDER BY / LIMIT performance: late row lookups
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Kill a postgresql session/connection
...g the database.
def drop_database(config)
case config['adapter']
when /mysql/
ActiveRecord::Base.establish_connection(config)
ActiveRecord::Base.connection.drop_database config['database']
when /sqlite/
require 'pathname'
path = Pathname.new(config['database'])
file = path....
count(*) vs count(column-name) - which is more correct? [duplicate]
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there is a performance difference (at least in MySQL) as well (see my answer).
– nickf
Jun 9 '10 at 7:51
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How to use GROUP_CONCAT in a CONCAT in MySQL
If I have a table with the following data in MySQL:
7 Answers
7
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MySQL: @variable vs. variable. What's the difference?
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MySQL has a concept of user-defined variables.
They are loosely typed variables that may be initialized somewhere in a session and keep their value until the session ends.
They are prepended with an @ sign, like this: @var
Yo...
c/c++如何判断指针无效？如NULL,0xcccccccc,0xfeeefeee,野指针等 - C/C++ -...
c/c++如何判断指针无效？如NULL,0xcccccccc,0xfeeefeee,野指针等c c++如何判断指针无效？不仅仅是NULL的判断，有时由于指针释放没有赋NULL，指针会变成野指针或诸如0xcccccccc,0xfeeefeee形式的无效指针，...c/c++如何判断指针无效？不仅仅是N...