如何在同一查询中添加两个选择命令的结果 [英] How to add results of two select commands in same query
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问题描述
我目前有以下两个选择命令.我想做的是将结果加到SQL查询中,而不是代码中的变量.
I currently have two select commands as per below. What I would like to do is to add the results together in the SQL query rather than the variables in code.
select sum(hours) from resource;
select sum(hours) from projects-time;
是否可以将两个都放在同一SQL中并输出两个结果的总和?
Is it possible to have both in the same SQL and output a sum of both results?
推荐答案
是.可能:D
SELECT SUM(totalHours) totalHours
FROM
(
select sum(hours) totalHours from resource
UNION ALL
select sum(hours) totalHours from projects-time
) s
作为旁注,必须对表名projects-time
进行分隔,以避免语法错误.分隔符在您使用的RDBMS上有所不同.
As a sidenote, the tablename projects-time
must be delimited to avoid syntax error. Delimiter symbols vary on RDBMS you are using.
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