此 Data Explorer SQL 查询有什么问题？

Question

我正在尝试在 Stack* Data Explorer我输入了多少？查询一个>。

修改现有查询让我到目前为止：

-- How much did I type?

DECLARE @UserId int = ##UserId##

  select sum(len(Body)) AS 'Posts' from posts where owneruserid = @UserId,
  select sum(len(Text)) AS 'Comments' from comments where userid = @UserId,
  (select sum(len(Body)) from posts where owneruserid = @UserId +
  select sum(len(Text)) from comments where userid = @UserId) AS 'Total'

我期望三列和一行，如下所示：

Posts    Comments    Total
1234     5678        6912

但是存在一些语法问题，因此我得到：

错误：“,”附近的语法不正确。 “,”附近的语法不正确。不正确 关键字“select”附近的语法。 “)”附近的语法不正确。

正确的语法是什么？

Answer 1

这是一个有效的查询：

DECLARE @UserId int;
set @UserID = 4;  

Select *, (Posts+Comments) as Total
FROM
  (select sum(len(Body)) AS Posts    FROM posts    where owneruserid = @UserId ) p,
  (select sum(len(Text)) AS Comments FROM comments where userid      = @UserId ) c

Answer 2

我会这样做...

declare @ownerId int
set @ownerId = 1

declare @Posts bigint
declare @Comments bigint

select
@Posts = sum(len(Body))
from Posts where owneruserid = @ownerId

select
@Comments = sum(len(Text))
from Comments where userid = @ownerId

select @Posts as 'Posts', @Comments as 'Comments', @Posts + @Comments as 'Total'

Answer 3

您好，您的问题是您有 3 个语句连接到 1 个语句 - 只需从 if 中生成一个语句：
就像

select sum(len(Body)) AS 'Posts', sum(len(Text)) AS 'Comments' , sum(len(Body)) + sum(len(Text)) AS Total
from posts t1 inner join comments t2 on t1.owneruserid = t2.userid 
where t1.owneruserid = @UserId

希望我输入正确一样...

Answer 4

-- How much did I type?

/* If this is to be a parameter from your app, you don't need to declare it here*/
DECLARE @UserId int;
set @UserID = 4;  

Select *, (Posts+Comments) as Total
FROM 
  (select sum(len(Body)) AS Posts    FROM posts    where owneruserid = @UserId ) p,
  (select sum(len(Text)) AS Comments FROM comments where userid      = @UserId ) c