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Listening Quiz: Yêu Cầu Giúp Đỡ Về Tối Ưu Hóa Truy Vấn – Easy Level
Th4 3, 2024
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bởi
Anna Phạm
trong
Tiếng Anh dành cho Nhà khoa học dữ liệu (English for Data Scientist)
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1.
What is the conversation mainly about?
A complaint about a broken computer screen
A conversation about making database queries run faster
A discussion about planning a database backup schedule
A request for help writing a new report
Explanation:
Robert says his database queries are very slow, and Emma gives advice about indexes and avoiding SELECT * to improve query performance.
2.
What does Emma suggest Robert avoid using?
A table name
An index
A database trigger
SELECT *
Explanation:
Emma says, ‘Also, try to avoid using SELECT *.’
3.
What does Emma say about SELECT *?
It works only on large tables
It fetches more data than needed
It helps queries run faster
It deletes extra rows
Explanation:
Emma explains that SELECT * ‘fetches more data than needed.’
4.
What can be inferred about Robert after the conversation?
He is not interested in fixing the slow queries
He wants Emma to write all of his database code
He already knows how to optimize all of his queries
He is willing to learn how to improve his database queries
Explanation:
Robert asks for help, wants to know how to check indexes, and says he will fix the issue after Emma explains it, showing he is willing to learn.
5.
What does Emma offer to do for Robert?
Create a new database for him
Delete unused tables
Rewrite all of his queries
Show him how to check indexes
Explanation:
Emma says, ‘I can show you how to check indexes.’
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