如何从 SQL Clickhouse 中的一行中减去其他行

Question

我对行的减法有疑问。 例如，执行此查询后：

select 
    case 
        when source in ('all') then 'all'
        when source in ('source1') then 'source1'
        when source in ('source2') then 'source2'
        when source in ('source3') then 'source3'
    end as source,
    
    sum(value) as sum
    
from table
group by 
    source

我有一张桌子：

source	sum
all	100
source 1	1
source 2	1
source 3	1

并且我想将“all-source1-source2-source3”值为 100-1-1-1=97 的新行添加到此表中。你能帮帮我吗？

Answer 1

select (arrayJoin(flatten([sa, ss, sd])) as x).1 source, x.2 sum
FROM (
       select groupArrayIf((source, sum), source='all') sa, 
              groupArrayIf((source, sum), source!='all') ss,
              [('diff', arraySum(sa.2) - arraySum(ss.2))] sd
       from (
               select  'all'  source, 100 sum union all
               select  'source 1', 1 union all
               select  'source 2', 1 union all
               select  'source 3', 1 
       )
    )

┌─source───┬─sum─┐
│ all      │ 100 │
│ source 1 │   1 │
│ source 2 │   1 │
│ source 3 │   1 │
│ diff     │  97 │
└──────────┴─────┘