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SQL how to increase or decrease one for a int column in one command
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To answer the first:
UPDATE Orders SET Quantity = Quantity + 1 WHERE ...
To answer the second:
There are several ways to do this. Since you did not specify a database, I will assume MySQL.
INSERT INTO table SET x=1, y=2 ON DUPLICATE KEY UPDATE x=x+1, y=y+2
REPLACE INTO table SET ...
delete_all vs destroy_all?
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edited May 23 '17 at 12:26
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answered Jul 14 '11 at 18:36
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Delete rows from a pandas DataFrame based on a conditional expression involving len(string) giving K
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184
When you do len(df['column name']) you are just getting one number, namely the number of rows ...
Rails :include vs. :joins
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180
It appears that the :include functionality was changed with Rails 2.1. Rails used to do the j...
What is the difference between tinyint, smallint, mediumint, bigint and int in MySQL?
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581
They take up different amounts of space and they have different ranges of acceptable values.
He...
Javascript Drag and drop for touch devices [closed]
...emove",
touchend: "mouseup"
}[event.type], true, true, window, 1,
touch.screenX, touch.screenY,
touch.clientX, touch.clientY, false,
false, false, false, 0, null);
touch.target.dispatchEvent(simulatedEvent);
event.preventDefault();
}
function init() {
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Using {} in a case statement. Why?
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195
The {} denotes a new block of scope.
Consider the following very contrived example:
switch (...
Linux下安装项目管理工具Redmine - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...ux下安装项目管理工具RedmineLinux下安装项目管理工具Redmine1、Ruby安装Ruby on Rails网站推荐使用1.8.7版。点击(此处)折叠或打开# wget ftp: ftp.ruby-lang.org ...Linux下安装项目管理工具Redmine
1、Ruby安装
Ruby on Rails网站推荐使用1.8.7版。
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How to cast int to enum in C++?
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int i = 1;
Test val = static_cast<Test>(i);
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How do I convert a pandas Series or index to a Numpy array? [duplicate]
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To get a NumPy array, you should use the values attribute:
In [1]: df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]}, index=['a', 'b', 'c']); df
A B
a 1 4
b 2 5
c 3 6
In [2]: df.index.values
Out[2]: array(['a', 'b', 'c'], dtype=object)
This accesses how the data is already ...