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Alter a MySQL column to be AUTO_INCREMENT
...ber between parenthesis does exactly nothing (well ok, almost nothing) for MySQL integer types. The only thing that may be influenced by the number is the display width, and it is up to the client to do that. But don't be deceived and think that it works like it does for VARCHAR and DECIMAL types - ...
Disable ActiveRecord for Rails 4
...existing applications:
1. Remove database adapter gems from your Gemfile (mysql2, sqlite3, etc.)
2. Change your config/application.rb
Remove require 'rails/all line and require frameworks (among those available in your rails version, the list varies, do not just copy) you want to use, for example...
Why is MySQL's default collation latin1_swedish_ci?
...rs? they changed this into a sane default, like utf8_general_ci. Good job, MySQL !
– Michael Trouw
Sep 24 '15 at 10:17
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MySQL Like multiple values
I have this MySQL query.
9 Answers
9
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MySql Table Insert if not exist otherwise update
... re-written using the proper INSERT ... ON DUPLICATE KEY UPDATE syntax for MySQL:
INSERT INTO AggregatedData (datenum,Timestamp)
VALUES ("734152.979166667","2010-01-14 23:30:00.000")
ON DUPLICATE KEY UPDATE
Timestamp=VALUES(Timestamp)
...
简单谈谈软件配置管理 - 项目管理 - 清泛网 - 专注C/C++及内核技术
...软件过程及其软件产品的跟踪能力。即：怎么命名？版本如何设置？放到哪里？哪些是受控的？受控的级别是什么？读写的权限是什么？
2、配置变更控制
IEEE中的定义：通过建立产品基线，控制软件产品的发布和在整个软件生...
What is the difference between BIT and TINYINT in MySQL?
...o
64. The default is 1 if M is omitted.
This data type was added in MySQL
5.0.3 for MyISAM, and extended in 5.0.5 to MEMORY, InnoDB, BDB, and NDBCLUSTER. Before 5.0.3, BIT is a
synonym for TINYINT(1).
TINYINT[(M)] [UNSIGNED] [ZEROFILL]
A very small integer. The signed range
is -12...
What is the maximum length of data I can put in a BLOB column in MySQL?
What is the maximum length of data I can put in a BLOB column in MySQL?
3 Answers
3
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Row count with PDO
... get the row count using PDO in PHP? Before using PDO, I just simply used mysql_num_rows .
23 Answers
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How can I find non-ASCII characters in MySQL?
I'm working with a MySQL database that has some data imported from Excel . The data contains non- ASCII characters (em dashes, etc.) as well as hidden carriage returns or line feeds. Is there a way to find these records using MySQL?
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