sql - select and join 错误必须出现在 GROUP BY 子句中或在聚合函数中使用

Question

我正在尝试这样做:

SELECT *,
case when SUM(fld_allocated_time) / 24 < fld_allocated_days 
then 'OK'
else 'NOK' 
end as Alocated
from
(
SELECT tbl_project.fld_id, tbl_project.fld_allocated_days, 
tbl_project_timesheet.fld_allocated_time 
FROM "SD_PRJ".tbl_project
INNER JOIN "SD_PRJ".tbl_project_timesheet
ON tbl_project.fld_id=tbl_project_timesheet.fld_id
) AS Alias

我得到这个错误:

ERROR: column "total.fld_id" must appear in the GROUP BY clause or be used in an aggregate function
SQL state: 42803
Character: 8

tbl = 表格
fld = 列
SD_PRJ = 架构名称

Answer 1

如果您想为查询的所有行计算一个总和，并将其与每一行中的 fld_allocated_days 进行比较，那么您可以试试这个:

with Alias as (
SELECT * from (
    SELECT tbl_project.fld_id, tbl_project.fld_allocated_days, 
           tbl_project_timesheet.fld_allocated_time 
    FROM "SD_PRJ".tbl_project
         INNER JOIN "SD_PRJ".tbl_project_timesheet
         ON tbl_project.fld_id=tbl_project_timesheet.fld_id
)
select a.*, 
       case when b.sm < fld_allocated_days then 'OK' else 'NOK' end as Alocated
from Alias a cross join
    (select SUM(fld_allocated_time) / 24 sm from Alias) b;

不过，我想你需要这样的东西:

SELECT tbl_project.fld_id,
       case when SUM(tbl_project_timesheet.fld_allocated_time) / 24 
                 < fld_allocated_days 
            then 'OK' 
            else 'NOK' 
       end as Alocated
FROM "SD_PRJ".tbl_project
     INNER JOIN "SD_PRJ".tbl_project_timesheet
     ON tbl_project.fld_id=tbl_project_timesheet.fld_id
GROUP BY tbl_project.fld_id, tbl_project.fld_allocated_days;