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AppInventor如何实现通过扫二维码导入表格数据 - App Inventor 2 拓展 - 清...
1、扫二维码：
使用原生的“条码扫描器”组件：
2、读取二维码中的url信息：
从上面条码组件的事件中获取。
3、访问远程url获取表格csv数据：
使用Web客户端组件访问url获取数据。数据格式建议采用csv（逗号分隔）格...
如何导入授权证书？ - App Inventor 2 离线版 - 清泛IT社区，为创新赋能！
步骤如下，导入证书后账户会自动填充好
如何查看 mac 地址？ - App Inventor 2 离线版 - 清泛IT社区，为创新赋能！
授权页面右下角有 mac 地址信息，点击复制图标即可复制到剪贴板，必要时提供给客服进行授权
What is the difference between MySQL Server and MySQL Client
...nstall both but what are the differences between the client and server for MySQL.
3 Answers
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How do I calculate square root in Python?
...valuate to 0.
And for the record, the preferred way to calculate a square root is this:
import math
math.sqrt(x)
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Find most frequent value in SQL column
...+1 for using standard SQL that will work in any database (whereas LIMIT is MySQL specific, TOP is SQL Server specific).
– Dylan Smith
Jul 20 '18 at 14:46
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Swapping column values in MySQL
I have a MySQL table with coordinates, the column names are X and Y. Now I want to swap the column values in this table, so that X becomes Y and Y becomes X. The most apparent solution would be renaming the columns, but I don't want to make structure changes since I don't necessarily have permission...
XAMPP - MySQL shutdown unexpectedly
When I open XAMPP and click start MySQL button and it gives me an error.
I had started it just before, but now it isn't working.
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SQL command to display history of queries
I would like to display my executed sql command history in my MYSQL Query Browser. What is the sql statement for displaying history?
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PDO MySQL: Use PDO::ATTR_EMULATE_PREPARES or not?
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To answer your concerns:
MySQL >= 5.1.17 (or >= 5.1.21 for the PREPARE and EXECUTE statements) can use prepared statements in the query cache. So your version of MySQL+PHP can use prepared statements with the query cache. However, make careful ...