CONCAT 在 SQL 故障排除时带有 CASE 的服务器

Question

Demand Structure

select
    Model,
    concat('',max(case when ranking = 1 then [Demand Structure] end ),round(cast(max(case when ranking = 1 then [Demand Structure] as float/count([Demand Structure]))*100,2),'%') top1_Demand_Structure,
    concat('',max(case when ranking = 2 then [Demand Structure] end ),round(cast(max(case when ranking = 2 then [Demand Structure] as float/count([Demand Structure]))*100,2),'%') top2_Demand_Structure
    --into #demand_structure_temp

from
    (
        SELECT 
        Model,
        [Demand Structure],
        COUNT(1)Demand_Structure_count,
        row_number() OVER(partition by model ORDER BY count(1) DESC) as Ranking
        FROM [EDW].[sio].[TB_R_SURVEY_IN_OPERATION] 
        group by Model,[Demand Structure]
    )a
group by model
order by 1;

round(cast(max(case when ranking = 1 then [Demand Structure] as float and round(cast(max(case when ranking = 2 then [Demand Structure] as float

this two is highlighted by sql server as the error.

I plan to show the percentage result of the numbers returned in this query

example of the result:

|Top_1_Age|
-----------
|A 50%    |
|B 35%    |

any suggestions?

Answer 1

Your parentheses are off. In complicated expressions, I often try to align opening and closing parens so the logic is clear:

select
    Model,
    concat('',
           max(case when ranking = 1 then [Demand Structure] end),
           round(cast(max(case when ranking = 1 then [Demand Structure] end
                         ) as float
                     ) /
                     count([Demand Structure]) * 100, 2
                 ), '%') as top1_Demand_Structure,
           concat('',
                  max(case when ranking = 2 then [Demand Structure] end ),
                  round(cast(max(case when ranking = 2 then [Demand Structure]
                                ) as float
                            ) /
                            count([Demand Structure]) * 100, 2
                       ), '%') as top2_Demand_Structure
    --into #demand_structure_temp