大约有 40,000 项符合查询结果（耗时：0.0282秒） [XML]
Gem::LoadError for mysql2 gem, but it's already in Gemfile
...upgrading to rails 4.2.4 (also with rails 4.1.5) try using this version of mysql2:
gem 'mysql2', '~> 0.3.18'
Apparently mysql2 isn't still compatible with newer version of rails because rails 4.2.4 is pretty new as the time of answering this question by me 8 September 2015 so use the above lin...
Is it possible to roll back CREATE TABLE and ALTER TABLE statements in major SQL databases?
...tive.
Is DDL transactional according to this document?
PostgreSQL - yes
MySQL - no; DDL causes an implicit commit
Oracle Database 11g Release 2 and above - by default, no, but an alternative called edition-based redefinition exists
Older versions of Oracle - no; DDL causes an implicit commit
SQL ...
Update one MySQL table with values from another
I'm trying to update one MySQL table based on information from another.
2 Answers
2
...
What is InnoDB and MyISAM in MySQL?
What is InnoDB and MyISAM in MySQL ?
8 Answers
8
...
MySQL InnoDB not releasing disk space after deleting data rows from table
I have one MySQL table using the InnoDB storage engine; it contains about 2M data rows. When I deleted data rows from the table, it did not release allocated disk space. Nor did the size of the ibdata1 file reduce after running the optimize table command.
...
Truncate all tables in a MySQL database in one command?
...
Drop (i.e. remove tables)
mysql -Nse 'show tables' DATABASE_NAME | while read table; do mysql -e "drop table $table" DATABASE_NAME; done
Truncate (i.e. empty tables)
mysql -Nse 'show tables' DATABASE_NAME | while read table; do mysql -e "truncate t...
pip install mysql-python fails with EnvironmentError: mysql_config not found
...
It seems mysql_config is missing on your system or the installer could not find it.
Be sure mysql_config is really installed.
For example on Debian/Ubuntu you must install the package:
sudo apt-get install libmysqlclient-dev
Maybe...
How can I view live MySQL queries?
How can I trace MySQL queries on my Linux server as they happen?
12 Answers
12
...
如何选择机器学习算法 - 大数据 & AI - 清泛网 - 专注IT技能提升
如何选择机器学习算法Choosing-a-Machine-Learning-Classifier机器学习 算法如何针对某个分类问题决定使用何种机器学习算法？ 当然，如果你真心在乎准确率，最好的途径就是测试一大堆各式各样的算法（同时确保在每个算法上也测试...
如何选择机器学习算法 - 大数据 & AI - 清泛网 - 专注IT技能提升
如何选择机器学习算法Choosing-a-Machine-Learning-Classifier机器学习 算法如何针对某个分类问题决定使用何种机器学习算法？ 当然，如果你真心在乎准确率，最好的途径就是测试一大堆各式各样的算法（同时确保在每个算法上也测试...