Home > Others

Database application Development (i)

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞
Data | database
Example (a company structure that calculates sales for each company):

A

B1 B2

B11 B12 B13 B21 B22 B23

....

Data: B11 (MB), B12 (B13), B21 (a) B22 () B23 (260) units: (million)

The total sales of each company are required, for example:

B1=b11+b12+b13 =100+120+60=280

b2=b21+b22+b23=90+70+260=420

a=b1+b2=700

To dynamically compute in real time

In practical applications there can be many ways to computer any point value!

1. Can be used in a progressive summary of the way

2. Can be grouped by way of summary (the purpose of this article)



Note: Compute the root node value with a few more code-optimized algorithms!

(not completed, to be continued)


This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More