Week 1 Lab Assignment grading issues


I doubt the grading of the Week 1 Lab Assignment. I am pretty sure I have executed all the SQL queries correctly, but I get a 0/15 score in the SQL Query section.

Please look into the attached file for your reference.

I would really appreciate if anyone explains me what might be the reason for this.

Best regards,

Don’t remember in what section I had zero score, but the issue was in quotes. Replacing single quote with double quotes solved problem.