📅  最后修改于: 2022-03-11 15:04:53.846000             🧑  作者: Mango
• Single Row Functions:(Lower, Upper, Substr, Length)
function that will run for each row and
return value for each row.
Multiple Row Functions (Group functions, Aggregate functions):
(Count, MIN , MAX, AVG, SUM)
will run for multiple rows and return a single value