access 在聚合查询中使用in 关键字会报错,
如:
select sum(iif(类别ID in (select ID from 类别 where 类别属性='测试') )) group by format(rq,'yyyy-mm-dd')
该用什么替代方案呢?
select sum(iif(类别ID in (select ID from 类别 where 类别属性='测试'),1,0 )) as 测试类数目 from t1 group by format(rq,'yyyy-mm-dd')
select COUNT(*) as 测试类数目 from t1 INNER JOIN 类别 ON 类别ID=ID where 类别属性='测试'
group by format(rq,'yyyy-mm-dd')
select count(类别.ID ) as 测试类数目
from t1 left join 类别 on t1.类别ID=类别.ID and 类别.类别属性='测试'
group by format(rq,'yyyy-mm-dd')