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App Inventor 2 颜色代码块 · App Inventor 2 中文网
...块
App Inventor 中的颜色如何发挥作用？
基本颜色
合成颜色
分解颜色
颜色代码块主要分为三种类型：
基本颜色
合成颜色
分解颜色
App Inventor 中的颜色如何发挥作用？
在内部，App...
任何组件块 · App Inventor 2 中文网
... 参数为 true 组件。
考虑以下事件处理伪代码，看看它是如何工作的：
发生一个事件，例如用户单击名为 Button1 的按钮。
组件被初始化为Button1。
notAlreadyHandled 初始化为true。
App Inventor 检查 when Button1.Click 是否存在。
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How to copy a row and insert in same table with a autoincrement field in MySQL?
In MySQL I am trying to copy a row with an autoincrement column ID=1 and insert the data into same table as a new row with column ID=2 .
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Calculate difference between two datetimes in MySQL
I am storing the last login time in MySQL in, datetime -type filed. When users logs in, I want to get the difference between the last login time and the current time (which I get using NOW() ).
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How do I get SUM function in MySQL to return '0' if no values are found?
Say I have a simple function in MySQL:
4 Answers
4
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Compare dates in MySQL
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For people comming from google: date type in mysql comes in yyyy-mm-dd format.
– Błażej Michalik
Nov 29 '15 at 20:24
add a comment
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Simulating group_concat MySQL function in Microsoft SQL Server 2005?
I'm trying to migrate a MySQL-based app over to Microsoft SQL Server 2005 (not by choice, but that's life).
11 Answers
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Convert text into number in MySQL query
Is it possible to convert text into number within MySQL query? I have a column with an identifier that consists a name and a number in the format of "name-number". The column has VARCHAR type. I want to sort the rows according the number (rows with the same name) but the column is sorted according d...
Ordering by specific field value first
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There's also the MySQL FIELD function.
If you want complete sorting for all possible values:
SELECT id, name, priority
FROM mytable
ORDER BY FIELD(name, "core", "board", "other")
If you only care that "core" is first and the other values ...
MySQL remove all whitespaces from the entire column
...UPDATE `table` SET `col_name` = REPLACE(`col_name`, '\n', '')
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_replace
To remove first and last space(s) of column :
UPDATE `table` SET `col_name` = TRIM(`col_name`)
http://dev.mysql.com/doc/refman/5.0/en/string-functions.htm...