咸鱼塘

题目 There is a table World +-----------------+------------+------------+--------------+---------------+ | name | continent | area | population | gdp | +---------------...

题目 Given a table salary, such as the one below, that has m=male and f=female values. Swap all f and m values (i.e., change all f values to m and vice versa) with a single update query and no interm...

题目 X city opened a new cinema, many people would like to go to this cinema. The cinema also gives out a poster indicating the movies’ ratings and descriptions. Please write a SQL query to output mo...