大约有 7,000 项符合查询结果（耗时：0.0152秒） [XML]
'IF' in 'SELECT' statement - choose output value based on column values
...IF(type = 'P', amount, amount * -1) as amount
FROM report
See http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html.
Additionally, you could handle when the condition is null. In the case of a null amount:
SELECT id,
IF(type = 'P', IFNULL(amount,0), IFNULL(amount,0) * -1) as...
SQL Client for Mac OS X that works with MS SQL Server [closed]
...r, which can work very well with almost every type of databases, including MySQL, SQL Server, Oracle, PostgreSQL, SAP Hana, Redis... just to name a few. The DB connector driver can be added in a very easy to understand way. I've also tried Oracle SQL Developer, DB Visualizer but they do not work w...
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“’” showing on page instead of “ ' ”
... when you create it.
You're most likely using SQL Server, but here is some MySQL code (copied from this article):
CREATE DATABASE db_name CHARACTER SET utf8;
CREATE TABLE tbl_name (...) CHARACTER SET utf8;
If your table is however already UTF-8, then you need to take a step back. Who or what put th...
那些年 O2O创业我踩了十个坑 - 资讯 - 清泛网 - 专注C/C++及内核技术
那些年 O2O创业我踩了十个坑作为创始人如何分清你的项目要不要坚持，首先要分清你做的项目是在坚持还是维持，坚持可以有明天，而维持，等待的只有败局。12月4日，黑马营第一次课程结束，为期三天的课程对我影响最大的...
SQL order string as number
I have numbers saved as VARCHAR to a MySQL database. I can not make them INT due to some other depending circumstances.
...
云数据及Firebase组件简介 · App Inventor 2 中文网
...据存储。
协作绘图应用程序
这是另一个示例，展示了如何使用 Firebase 将聊天与绘图程序结合起来进行协作草图：Firebase Chat with Interactive Drawing。
FirebaseDB vs TinyWebDB
如果你熟悉 App Inventor 的 TinyWebDB 组件，你会发现 FirebaseDB ...
【教学】AppInventor2人工智能应用：Personal Image Classifier (PIC) Tool...
...-link-color)]
3. 加入測試資料訓練完了要考試1才知道成效如何。請加入測試資料（最好是未用於訓練的資料）。您可以換一個背景試試看偵測的效果如何。請上傳照片或使用 webcam 拍照，完成後按下 [Predict] 按鈕，會直接跳到 (4)....
Add Foreign Key to existing table
...is link. It has helped me with errno 150:
http://verysimple.com/2006/10/22/mysql-error-number-1005-cant-create-table-mydbsql-328_45frm-errno-150/
On the top of my head two things come to mind.
Is your foreign key index a unique name in the whole database (#3 in the list)?
Are you trying to set th...
How do I use a file grep comparison inside a bash if/else statement?
...error occurs and -q was not given, the exit status is 2.
if grep --quiet MYSQL_ROLE=master /etc/aws/hosts.conf; then
echo exists
else
echo not found
fi
You may want to use a more specific regex, such as ^MYSQL_ROLE=master$, to avoid that string in comments, names that merely start with "mast...