SQL is still the connective tissue of every modern data stack—from cloud warehouses to mobile apps. Recruiters know it, too: employer demand for SQL skills grew 46% year-over-year, according to labour ...

Your output will differ based on the book you chose. You should see 13 rows total, with your new book appearing at the end with book_id = 13 and available = true.

( NOTE : ABOVE ADVANTAGE IS WE CAN DISPLAY ONLY WHAT WE NEED THAT THINGS ONLY WE CAN ADD TO QUERY BUT ALL THE INNER QUERIES ARE EXECUTED BUT WE CAN RESTRICT WHAT DISPLAY IN OUTER SUBQUERY) ...