PostgreSQL分區由ZERO

Question

我想在SELECT子句中執行除法。當我加入一些表並使用聚合函數時，我通常會將零值或零值作爲分隔符。至於現在我只想出這種避免零和空值除法的方法。

選擇 date_part數（ '周'，startmeasurement ::日期）AS星期，

 (COUNT(CASE WHEN new_spm.status IN ('Closed','Resolved')THEN 1 ELSE NULL END) 
    *100/count(case when new_spm.status !='Cancelled' THEN 1 ELSE NULL END)::double precision) AS percentage_closed_and_resolved 

from new_spm 

WHERE new_spm.divisi='CNOS-HQ' 

GROUP BY week; 

Answer 1

以PostgreSQL中可看看COALESCE表達。它應該大大簡化你目前的方法。

https://www.postgresql.org/docs/current/static/functions-conditional.html