Question

我有大量的药物和日期数据一种药物可能在同一个月内开处方不止一次

我需要列出详细信息，只要药物每月处方超过3次老实说我对日期查询不好

select Tradename as Drug, TO_CHAR(PrescDT,'MM-YYYY') as Date_Prescribe
from PRESCRIPTION
group by TradeName
having count(PrescDT) > 3;

给我一个错误“不是GROUP BY表达式”并且结果是错误的。提前致谢

Answer 1

以下查询应该有效：

select Tradename as Drug, TO_CHAR(PrescDT,'MM-YYYY') as Date_Prescribe
    from PRESCRIPTION
    group by TradeName,to_char(PrescDT,'MM-YYYY') 
    having to_char(PrescDT,'MM-YYYY')>3

Answer 2

select Tradename as Drug, TO_CHAR(PrescDT,'MM-YYYY') as Date_Prescribe
from PRESCRIPTION
group by TradeName, TO_CHAR(PrescDT,'MM-YYYY')
having count(*) > 3;

您可以使用TRUNC(PrescDT,'MM')代替TO_CHAR，而应该提高效率。

Answer 3

使用CTE数据：

with prescription as (
  select 'advil' as tradename, TO_DATE('04-2015', 'MM-YYYY') as PrescDT from dual UNION ALL
  select 'advil' as tradename, TO_DATE('04-2015', 'MM-YYYY') as PrescDT from dual UNION ALL
  select 'advil' as tradename, TO_DATE('04-2015', 'MM-YYYY') as PrescDT from dual UNION ALL
  select 'advil' as tradename, TO_DATE('06-2015', 'MM-YYYY') as PrescDT from dual UNION ALL
  select 'tylenol' as tradename, TO_DATE('09-2015', 'MM-YYYY') as PrescDT from dual UNION ALL
  select 'advil' as tradename, TO_DATE('04-2015', 'MM-YYYY') as PrescDT from dual UNION ALL
  select 'tylenol' as tradename, TO_DATE('08-2015', 'MM-YYYY') as PrescDT from dual UNION ALL
  select 'morphine' as tradename, TO_DATE('10-2015', 'MM-YYYY') as PrescDT from dual 
)
select tradename as Drug, PrescDt as Date_Prescribe
from prescription
group by tradename, prescdt
having count(prescdt) > 3
;

输出：

DRUG   DATE_PRESCRIBE
advil   04-2015

Answer 4

试试这个：
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath { [cell setBackgroundColor:[UIColor clearColor]]; }

sql oracle count发生日期

4 个答案: