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Which is faster: multiple single INSERTs or one multiple-row INSERT?
I am trying to optimize one part of my code that inserts data into MySQL. Should I chain INSERTs to make one huge multiple-row INSERT or are multiple separate INSERTs faster?
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Remove ActiveRecord in Rails 3
... line that loads the module for your database. This could be the line gem "mysql" for example.
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View's SELECT contains a subquery in the FROM clause
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As per documentation:
MySQL Docs
The SELECT statement cannot contain a subquery in the FROM clause.
Your workaround would be to create a view for each of your subqueries.
Then access those views from within your view view_credit_status
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How can I see the specific value of the sql_mode?
There are some sql_mode values in MySQL:
2 Answers
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How Scalable is SQLite? [closed]
I recently read this Question about SQLite vs MySQL and the answer pointed out that SQLite doesn't scale well and the official website sort-of confirms this , however.
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FloatActionBtn 扩展：悬浮操作按钮扩展，可自定义颜色、大小、图标和位置 ...
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版本信息
常见问题
Q: 如何更改按钮位置？
Q: 支持自定义图标吗？
Q: 如何禁用波纹效果？
Q: 可以设置任意位置吗？
Q: 按钮不显示怎么办？
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Foreign key constraints: When to use ON UPDATE and ON DELETE
I'm designing my database schema using MySQL Workbench, which is pretty cool because you can do diagrams and it converts them :P
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App Inventor 2开发计步器与定位器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...编写“健身宝”手机应用程序
3.问题：
（1）如何获取走路步数、距离？
（2）如何计算走路时间？
（3）如何获得当前位置？
（4）如何存储信息？
4.规划：
（1）利用pedometer（计步器）组件...
SQL standard to escape column names?
Is there a SQL standard to escape a column name? If not what works for MySQL and SQLite? does it also work for SQL Server?
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MongoDB vs. Cassandra [closed]
...sandra: they are not using Cassandra for persisting tweets, they use still MySQL here (engineering.twitter.com/2010/07/cassandra-at-twitter-today.html). Ok, but I can imagine that they still store lots of data for other purposes in Cassandra.
– H6.
Jan 13 '12 a...