Very simple, given an integer or a floating-point number, find its opposite. Examples: 1: -1 14: -14 -34: 34 You will be given a table: opposite, with a column: number. Return a table with a column: res. Solution: SELECT number * -1 AS res FROM opposite Below is a method to solve uselessly and difficultly using CASE and SIGN. The 'SIGN' function tells whether the number is negative or positive w..