Finish with a mixed review of SQL and operational judgment. The requests combine previously taught skills, so decide which table grain and account feature fit before you write a statement. The SQL tasks use new filters or output contracts. They include nested lines, deterministic updates, safe file loading and a stream whose changes must reach a target.
The final two questions ask you to interpret evidence rather than repeat a command name. A small result can still scan many partitions, and a query that works under an administrator role doesn't establish reader access. Use the hints only after trying your own approach. These are original practice tasks for course and job-test preparation, with no prediction about an employer's exact questions.