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How do I see what character set a MySQL database / table / column is?
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Should be noted that information_schema is only in MySQL 5 onwards I believe.
– Vex
Jun 26 '09 at 16:54
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How can prepared statements protect from SQL injection attacks?
...ven alter it, as every SQL injection example shows it (all examples in PHP/Mysql):
$expected_data = 1;
$query = "SELECT * FROM users where id=$expected_data";
will produce a regular query
SELECT * FROM users where id=1
while this code
$spoiled_data = "1; DROP TABLE users;"
$query = "S...
What is a proper naming convention for MySQL FKs?
Being that they must be unique, what should I name FK's in a MySQL DB?
4 Answers
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How to get the sizes of the tables of a MySQL database?
I can run this query to get the sizes of all tables in a MySQL database:
16 Answers
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Fastest Way to Find Distance Between Two Lat/Long Points
I currently have just under a million locations in a mysql database all with longitude and latitude information.
15 Answers...
MySQL OPTIMIZE all tables?
MySQL has an OPTIMIZE TABLE command which can be used to reclaim unused space in a MySQL install. Is there a way (built-in command or common stored procedure) to run this optimization for every table in the database and/or server install, or is this something you'd have to script up yourself?
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How do I add indices to MySQL tables?
I've got a very large MySQL table with about 150,000 rows of data. Currently, when I try and run
7 Answers
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C++特化模板函数的符号多重定义错误问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
....h 中，结果出现特化模板函数的符号多重定义错误。我要如何组织头文件才能避免多重符号定义错误？我用 /FORCE:MULTIPLE，但我想用一个更好的解决方法。
Lee Kyung Jun
实际上，确实用更好的解决方法。稍后我会解释，但首先让我...
Updating MySQL primary key
...-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f2341576%2fupdating-mysql-primary-key%23new-answer', 'question_page');
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如何实现心电图曲线 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
本帖最后由 chenweigang 于 2024-06-21 17:03 编辑
我想做一个采集数据，显示曲线的app，类似下图显示心电图和心率这样的曲线，请问需要用什么控件实现，如果实现多条曲线又该怎么办？
简单的图表使用原生组件可以实现：
有...