Question

我设置了一些代码，以（希望地）根据飞顶位置监视本月我们有多少飞顶，以及上个月有多少飞顶。

该语法已被系统接受，但不会带回任何值-仅为0。

我是Oracle SQL的新手，认为我需要将子查询链接到主查询，但不确定如何操作

我想要实现的是一张表，上面写着：

Location Type            Current Month             Last Month
Back Alley                    132                      203
Rail Land                       4                       23

我的代码是：

  select        parameter_value.param_value_name as Fly_tip_location,

(select count (parameter_value.param_value_name) from   job
inner join  job_attribute on job.job_number = job_attribute.job_number
inner join  parameter_value on parameter_value.param_type_code = job_attribute.param_type_code and
            parameter_value.param_value_code = job_attribute.param_value_code
inner join job_status_log on job.job_number = job_status_log.job_number and job.job_log_number = job_status_log.job_log_number
inner join job_status on job_status.status_code = job_status_log.status_code
where       job_attribute.param_type_code = 'FT02' and
job_status.status_code = '5200' and
 job.actual_start_date >= TRUNC(ADD_MONTHS(SYSDATE, -1), 'MM')
  AND job.actual_start_date < TRUNC(SYSDATE, 'MM')) as Last_Month_Total,

(select count (parameter_value.param_value_name) from   job
inner join  job_attribute on job.job_number = job_attribute.job_number
inner join  parameter_value on parameter_value.param_type_code = job_attribute.param_type_code and
            parameter_value.param_value_code = job_attribute.param_value_code
inner join job_status_log on job.job_number = job_status_log.job_number and job.job_log_number = job_status_log.job_log_number
inner join job_status on job_status.status_code = job_status_log.status_code
where       job_attribute.param_type_code = 'FT02' and
job_status.status_code = '5200' and
 job.actual_start_date >= TRUNC(ADD_MONTHS(SYSDATE, 0), 'MM')
  AND job.actual_start_date < TRUNC(SYSDATE, 'MM')) as Current_Month_Total

 from job
inner join  job_attribute on job.job_number = job_attribute.job_number
inner join  parameter_value on parameter_value.param_type_code = job_attribute.param_type_code and
            parameter_value.param_value_code = job_attribute.param_value_code
inner join job_status_log on job.job_number = job_status_log.job_number and job.job_log_number = job_status_log.job_log_number
inner join job_status on job_status.status_code = job_status_log.status_code


group by    parameter_value.param_value_name
order by    parameter_value.param_value_name`

Answer 1

我明白了为什么您可能会对当前月份的值计数为零；您的第二个子查询具有：

job.actual_start_date >= TRUNC(ADD_MONTHS(SYSDATE, 0), 'MM')
AND job.actual_start_date < TRUNC(SYSDATE, 'MM'))

与

相同

job.actual_start_date >= TRUNC(SYSDATE, 'MM')
AND job.actual_start_date < TRUNC(SYSDATE, 'MM'))

，列值不能同时为>=和 <。

我不确定您为什么上个月也将获得零计数-如果没有相关性，我希望这个数字可能比您想要的高，但不为零，因此也许我们可以在数据中包含一些东西。看不到。

无论如何...正如@ PM77-1所建议的，您可以使用条件聚合来简化此操作，例如：

select pv.param_value_name as fly_tip_location, count(case when j.actual_start_date >= trunc(sysdate, 'MM') then j.job_number end) as current_month, count(case when j.actual_start_date < trunc(sysdate, 'MM') then j.job_number end) as last_month from job j join job_status_log jsl on jsl.job_number = j.job_number and jsl.job_log_number = j.job_log_number --join job_status js on js.status_code = jsl.status_code -- not needed join job_attribute ja on ja.job_number = j.job_number join parameter_value pv on pv.param_type_code = ja.param_type_code and pv.param_value_code = ja.param_value_code where j.actual_start_date >= trunc(add_months(sysdate, -1), 'MM') and jsl.status_code = '5200' and pv.param_type_code = 'FT02' group by pv.param_value_name order by pv.param_value_name;

这一次打完所有表格-您不需要job_status，因此我已将其注释掉，但可以将其完全删除-并在上一个日期开始后对整个日期范围进行过滤月份，以及您感兴趣的状态代码和参数类型。

然后在每个aggregation / count子句中，它使用一个case表达式来确定要计算的月份数据。在第一个中，它仅计算开始日期在当月开始之后的作业；在第二个中，它仅计算开始日期在当前月份开始之前（即上个月）的作业，因为这是where子句中的过滤器所留下的全部内容。

不提供总价值的计数

1 个答案: