TSQL - 求和

Question

是否可以获得Select语句的总和？

sum(Select (VPTOTALS.TIMEINSECONDS/3600) 
    from Table XXXX
    inner join Table YYYY
    on ..... = ......
    and ..... = .....) as Hours`

我已经看过它，但我无法让它为我工作。我收到语法错误sum(Select和)作为小时

由于

Answer 1

没有。您执行{__esModule: true, default: ƒ} default : ƒ Factory() createQueryString : ƒ (state, options) version : "2.2.1" connectors : [Exception: ReferenceError: You can't access to 'instantsearch.connectors' directly from the ES6 build. Import the connectors this way 'import {connectSearchBox} from "instantsearch.js/connectors"' at Function.get (http://localhost:8100/build/0.js:9985:11) at Function.remoteFunction (<anonymous>:2:14)] length : 0 name : "Factory" prototype : EventEmitter {constructor: ƒ, addWidget: ƒ, start: ƒ, createURL: ƒ, _render: ƒ, …} widgets : [Exception: ReferenceError: You can't access to 'instantsearch.widgets' directly from the ES6 build. Import the widgets this way 'import {SearchBox} from "instantsearch.js/widgets"' at Function.get (http://localhost:8100/build/0.js:9979:11) at Function.remoteFunction (<anonymous>:2:14)] get connectors : ƒ get() get widgets : ƒ get() __proto__ : ƒ InstantSearch(_ref) [[FunctionLocation]] : to-factory.js:5 [[Scopes]] : Scopes[3] __esModule : true __proto__ : Object 的{​​{1}}：

select

Answer 2

您可以使用：

SELECT SUM(VPTOTALS.TIMEINSECONDS/3600) 
FROM Table XXXX
INNER JOIN Table YYYY on ..... = ......
   and ..... = .....)

这将自动对整个查询求和，因为select语句中没有其他非聚合列。

如果您想在查询中包含非聚合，则需要group by子句，以便用该变量对其进行拆分：

SELECT type,
       SUM(VPTOTALS.TIMEINSECONDS/3600) 
FROM Table XXXX
INNER JOIN Table YYYY on ..... = ......
       and ..... = .....)
GROUP BY type

Answer 3

如果这是一个相关的子查询，那么它可以是

Select t1.Col1
, sum( select sum(somecol) from sometbl t2 where t2.fk = t1.id ) 
   as hours
From outertbl t1
Group by t1.col1

但是这个例子是人为的而且没有效率。