I can not understand what IntelliJ IDEA swears at when trying to write data to the MySQL database?

Question

MySQL

I 'm
learning to work with MySQL database, I wrote the code, it works, but IntelliJ IDEA highlights the error, but does not offer its solution, what does it want from me?
java 1.8

Answer 1

Another question, I have an ID as unique with autocomplete, but in the end, using the code presented above, I have to manually write a unique ID, because. Autocomplete doesn't work for some reason, how can I fix this?
In MySQLWorkbench itself, it works, indexes are set.
And it turns out that I have to first look for the latest index, and only then add a unique one