将SQL ROws中的数据转置为列

Question

我有一个查询

public class CartOrder  {
    List<Data> data;

    public CartOrder () {
        data = new ArrayList<Data>();
    }

    public List<Data> getData() {
        return data;
    }

    public void setData(List<Data> data) {
        this.data = data;
    }

    public void addData(Data data) {
        this.data.add(data);
    }

    class Data {
        String name;

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }
    }
}

给出了如下输出：

SELECT circlename, 
alarmname,
count(alarmname) as Count
from temip_alarm 
where alarmname='Site Down' or 
alarmname='Predicted_Site Down' or
alarmname='Mains Fail' or 
alarmname='Fire & Smoke' or 
alarmname='Shelter Temperature High' 
group by circlename, alarmname;

但我需要这样的数据：

任何人都可以帮我实现这个目标..

Answer 1

使用case表达式进行条件聚合：

SELECT circlename, 
       sum(case when alarmname = 'Site Down' then 1 else 0 end) as SiteDownCount,
       ...,
       count(*) as GrandTotal
from temip_alarm 
where alarmname IN ('Site Down', 'Predicted_Site Down', 'Mains Fail',
                    'Fire & Smoke', 'Shelter Temperature High') 
group by circlename

Answer 2

这为SQL Server

扩展了@jarh版本

SELECT (case when GROUPING(circlename) = 1 
             then 'GrandTotal' else circlename end) circlename, 
        sum(case when alarmname = 'Site Down' then 1 else 0 end) as SiteDownCount,
        ...,
        count(*) as GrandTotal
from temip_alarm 
where alarmname IN ('Site Down', 'Predicted_Site Down', 'Mains Fail',
                    'Fire & Smoke', 'Shelter Temperature High') 
group by rollup(circlename)