Basic knowledge of database technologies?

Question

Career in IT

Actually the question is: how basic should they be and what do they mean by this?

Answer 1

write simple queries. surprisingly for many, this is an impossible task.

Answer 2

Ask the person who asked you this question - what exactly did he mean.
Because databases are a vast topic.
PS:
Wangyu - means SQL and normal forms.

Answer 3

Up to third normal form basic.

Answer 4

SQL syntax (of the DBMS that you will use Posgresql, Mysql, etc), IDE for the database, what is NoSQL, normalization methods, basic operations (JOIN, LEFT JOIN, RIGHT JOIN), indexes