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Fastest way to determine if an integer's square root is an integer
...st way to determine if a long value is a perfect square (i.e. its square root is another integer):
35 Answers
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GestureDetect 手势检测扩展：识别滑动、点击和长按手势 · App Inventor 2 中文网
...作用？
Q: 可以在滚动排列中使用吗？
Q: 如何在同一个组件上检测多种手势？
Q: 可以自定义手势的灵敏度吗？
Q: 支持哪些布局组件？
Q: 如何实现更复杂的图片滑动功能？
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How to add a primary key to a MySQL table?
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mysql doesn't recognize MODIFY as proper statement(at least in XAMPP, InnoDB)
– LMD
Jul 13 '18 at 18:25
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转型产品经理必看 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...文章。创办人人都是产品经理以来，每天都有很多人问我如何转型做产品经理、转型产品经理会遇到哪些问题，其实我一直没能回答好这个问题，因为我从运营转型产品经理的过程太顺利，并且转型的过程也没有做太多的思考和...
clang error: unknown argument: '-mno-fused-madd' (python package installation failure)
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If you install as root you need to set the flags for the root user.
– ErikAndren
Mar 18 '14 at 6:29
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How do I convert from BLOB to TEXT in MySQL?
I have a whole lot of records where text has been stored in a blob in MySQL. For ease of handling I'd like to change the format in the database to TEXT... Any ideas how easily to make the change so as not to interrupt the data - I guess it will need to be encoded properly?
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How to add not null constraint to existing column in MySQL
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Oddly I was getting an error (MySQL 5.6, Workbench 6.3) changing/modifying a column I'd named null_heart_rate_count, error was #1138, Invalid use of NULL value. I had to drop and add the column instead.
– William T. Mallard
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Difference between Key, Primary Key, Unique Key and Index in MySQL
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KEY and INDEX are synonyms in MySQL. They mean the same thing. In databases you would use indexes to improve the speed of data retrieval. An index is typically created on columns used in JOIN, WHERE, and ORDER BY clauses.
Imagine you have a table called...
Select all columns except one in MySQL?
... trying to use a select statement to get all of the columns from a certain MySQL table except one. Is there a simple way to do this?
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How to change context root of a dynamic web project in Eclipse?
...In your project's Properties, choose Web Project Settings.
Change Context root to app.
Choose Window > Show View > Servers.
Stop the server by either clicking the red square box ("Stop the server" tooltip) or context-click on the server listing to choose "Stop".
On the server you want to ...