从所有记录中汇总字段值

Question

HY。如果我将存储在字段中的所有值相加，我该如何设置查询？ 现在我有了这个问题：

"SELECT views FROM visitors WHERE visited_user = '123'"

我存储了这些记录：

id    visitor   visited_user    views
-------------------------------------
1     555       123             15
2     666       123             23
3     777       123             45
-------------------------------------
total                           83

Answer 1

使用sum() function：

SELECT SUM(views) 
FROM   visitors 
WHERE  visited_user = '123'

Answer 2

SELECT SUM(views) FROM visitors WHERE visited_user = '123'