Having和Where都是过滤数据的关键子句 Where是在分组之前过滤数据
SELECT * FROM Employees WHERE department Tech;Having是在分组之后利用聚合函数进行过滤
SELECT department, AVG(salary) AS average_salary
FROM Employees
GROUP BY department
HAVING AVG(salary) >…
ICode国际青少年编程竞赛- Python-1级训练场-for循环与变量 1、 a 1
for i in range(4):Spaceship.step(a)Dev.step(2)Dev.step(-2)a a 12、 a 1
for i in range(4):Spaceship.step(a)Dev.step(3)Dev.step(-3)a a 13、
a 1
for i in range(4):Dev.turnLeft()Dev.step(…