Task: Text to Code
Input (English): Step 1: For each row in Employee table, find the corresponding rows in Customer table.
Step 2: find Employee's LastName of the results of step 1 whose Customer's LastName greater than 20
Output (English): SELECT T2.LastName FROM Customer AS T1 JOIN Employee AS T2 ON T1.SupportRepId = T2.EmployeeId WHERE T1.LastName > 20