How long did it take you to complete the sql-ex.ru course?

Question

SQL

I would like to know if there are people on the toaster who have received certificates from sql-ex? How long did it take you to complete the course on average? Is there any reason?

Answer 1

It took a lot of time, but largely because of my laziness. Several times he took, threw, returned again.
I had enough until the 1st certificate.
There is definitely a sense if you have to actively work with the database + the authority in the eyes of colleagues on this issue rises. Perhaps it does not make sense to go to the very last task, because the closer to the end, the closer the tasks are to the Olympiad programming (sql for sql) and further from real life. And the restrictions imposed in the tasks are quite artificial. But it is very useful to solve at least the training stage on SELECT and DML.

Answer 2

is it necessary?
especially when questions like:

Which of the following predicates evaluates to TRUE?
1) 'abc' = 'abc'
2) 'abc' like 'abc'
3) 'abc' like 'abc'
4) 'abc' = 'abc'
5) 'abc' like 'abc'
6) 'abc' like 'abc'