sql - Oracle analytical function suggestions -


i have metrics tracked on project value keeps increasing time goes by.

sample data:

 project | date        | metric% ---------------------------------   p1     | 05-jan-2015 |  40   p1     | 10-jan-2015 |  50   p1     | 05-feb-2015 |  60   p1     | 01-mar-2015 |  70   p1     | 25-mar-2015 |  80   p1     | 03-apr-2015 |  90

i need month wise effective value below. if there metric value on 1st of month, used else last measured value in previous month used.

 project | month start date | effective metric% ------------------------------------------------    p1    | 01-feb-2015      |   50    p1    | 01-mar-2015      |   70    p1    | 01-apr-2015      |   80    p1    | 01-may-2015      |   90

i'm using sql below this:

select sq2.project_id, sq2.mon_start_dt, sq2.metric_value (select     sq1.project_id,     trunc(sq1.metric_measurement_dt, 'month') mon_start_dt, -- gives date in format 01mmyyyy     /* check if metric_measurement_dt 1st day of month (01mmyyyy), if use metric value else use previous metric value */     case when extract(day sq1.metric_measurement_dt) = 1 sq1.metric_current_val else sq1.metric_previous_val end metric_value, (     /* current , previous metric values measurement dates */     select         project_id,         metric_measurement_dt,         row_number() on (partition project_id, extract(month metric_measurement_dt) order metric_measurement_dt) mm_start_row,         metric_value metric_current_val,         lag(metric_value) on (partition project_id order     metric_measurement_dt) metric_previous_val,          table t1      ) sq1     sq1.mm_start_row = 1) sq2 sq2.metric_value not null;

the above query not give me row 01-may-2015. believe because there no measurement has happened in month of may.

can give comments on fixing issue?

here alternative approach. each record, current value , previous value. also, enumerate values within month. then, choose first value in month. if day of month "1", take current value. otherwise, take previous value:

select project_id, trunc(metric_measurement_dt, 'month') mon,        (case when extract(day metric_measurement_dt) = 1 metric_value              else prev_value         end) metric_value (select project_id, metric_measurement_dt, metric_value,              row_number() on (partition project_id, extract(month metric_measurement_dt)                                 order metric_measurement_dt) seqnum,              lag(metric_value) on (partition project_id                                      order metric_measurement_dt) prev_value       table t1       ) t seqnum = 1

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