This query is used to count the drug era records stratified by observation month. The input to the query is a value (or a comma-separated list of values) of a month. If the input is ommitted, all possible values are summarized.
Input:
| Parameter |
Example |
Mandatory |
Notes |
| list of month numbers |
3, 5 |
Yes |
|
Sample query run:
The following is a sample run of the query. The input parameters are highlighted in blue
select extract(month from er.drug_era_start_date) month_num, COUNT(1) as eras_in_month_count
from drug_era er
where extract(month from er.drug_era_start_date) in (3, 5)
group by extract(month from er.drug_era_start_date)
order by 1
;
Output:
Output field list:
| Field |
Description |
| drug_era_id |
A system-generated unique identifier for each drug era. |
| drug_era_start_date |
The start date for the drug era constructed from the individual instances of drug exposures. It is the start date of the very first chronologically recorded instance of utilization of a drug. |
| month |
|
Sample output record:
| Field |
Description |
| drug_era_id |
|
| drug_era_start_date |
|
| month |
|
| 