[英]How to avoid DIVIDE BY ZERO error in an SQL query
SELECT YEAR, period, round((1- sum(rej_qty) / sum(recd_qty))*100, 0)
FROM TAB_A
WHERE sid = '200'
AND sdid IN ('4750')
AND
(
(
YEAR ='2011'
AND period IN('01_JAN')
)
OR
(
YEAR = '2010'
AND period IN('02_FEB','03_MAR','04_APR','05_MAY','06_JUN','07_JUL','08_AUG','09_SEP','10_OCT','11_NOV','12_DEC')
)
)
group by year, period
對於特定月份,recd_qty為零,因為我得到了DIVIDE BY ZERO錯誤。
有什么方法可以避免DIVIDE BY ZERO錯誤嗎?
我有什么方法可以忽略那個特定的月份?
你嘗試過使用NULLIF()
嗎?
SELECT
( 100 / NULLIF( 0, 0 ) ) AS value
;
Oracle Doc
http://www.oracle-base.com/articles/9i/ANSIISOSQLSupport.php#NULLIFFunction
另一個例子
http://www.bennadel.com/blog/984-Using-NULLIF-To-Prevent-Divide-By-Zero-Errors-In-SQL.htm
如果要忽略此類記錄,可以使用子查詢
SELECT YEAR, period, round((1- rej_sum / recd_sum)*100, 0) FROM
(
SELECT YEAR, sum(rej_qty) rej_sum, sum(recd_qty) recd_sum
FROM TAB_A
WHERE sid = '200'
AND sdid IN ('4750')
AND
(
(
YEAR ='2011'
AND period IN('01_JAN')
)
OR
(
YEAR = '2010'
AND period IN ('02_FEB','03_MAR','04_APR','05_MAY','06_JUN','07_JUL','08_AUG','09_SEP','10_OCT','11_NOV','12_DEC')
)
)
group by year, period
)
WHERE recd_sum <> 0;
如果你想保留它們並通過零問題處理除法,你可以使用解碼或大小寫
SELECT YEAR, period, DECODE(recd_qty, 0, NULL, round((1- sum(rej_qty) / sum(recd_qty))*100, 0))
round(ISNULL(
((1- sum(rej_qty)) / NULLIF( (sum(recd_qty))*100), 0 )),
0
),0)
如果使用NULLIF替換除法以在除以零時設置NULL,則使用ISNULL將NULL替換為0 - 或者實際上是您想要的值。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.