According to Chinese computer technology professional qualification [Network] Nian 2021 01 Yue 22 day notice:
The new version of the tutorial is based on the newly revised "Database System Engineer Examination Syllabus" and is re-written by experts organized by the National Computer Professional Technical Qualification Examination Office.
The details are as follows:
"Database System Engineer Course (Fourth Edition)" published at the end of December 2020
2021-01-22 Source: China Computer Technology Vocational Qualification Network
The "Database System Engineer Course (Fourth Edition)" (hereinafter referred to as the new edition course) compiled by the National Computer Professional Technical Qualification Examination Office was published by Tsinghua University Press at the end of December 2020.
The new version of the tutorial is based on the newly revised "Database System Engineer Examination Syllabus" and is re-written by experts organized by the National Computer Professional Technical Qualification Examination Office. "Database System Engineer Tutorial (Fourth Edition)" is a guide book for the national computer technology and software professional technical qualification (level) examination. It can be used as a learning guidance textbook for school students, and can also be used as a reference for self-study by industry professionals.
Relevant professional and technical personnel can purchase the book through local bookstores or related e-commerce websites. For more information, please pay attention to the China Computer Technology Professional Qualification Network www.rua nkao.org.cn. 
( Screenshots and information are from: China Computer Technology Vocational Qualification Network)
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