MySQL SUM over CASE语句 [英] MySQL SUM over CASE statement
本文介绍了MySQL SUM over CASE语句的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
有人可以帮助我在下面的SQL中获得A_VAL的总和
Could someone please help me get the SUM of A_VAL in the below SQL
SELECT
CASE
WHEN COUNT(t.A_INS_NAM) = 10 THEN 1
WHEN COUNT(t.A_INS_NAM) = 20 THEN 2
WHEN COUNT(t.A_INS_NAM) BETWEEN 30 AND 50 THEN 3
WHEN COUNT(t.A_INS_NAM) > 50 THEN 5
ELSE 'some value'
END AS A_VAL
FROM
TABLE1 t
JOIN IWD t1 ON(t.A_INS_NAM = t1.A_INS_NAM)
JOIN TIM t2 ON(t1.IWD = t2.IM_ID)
JOIN TWS t3 ON(t2.IM_ID = t3.T_ID )
WHERE t3.TN = 'abced'
AND t.A_DATE BETWEEN '2014-01-01' AND '2015-05-01'
AND t.A_INS_NAM NOT LIKE '%pk%'
推荐答案
您可以使用子选择来计算总和,请注意,您使用的是不带分组的聚集函数,结果将是单行
You can use a sub select to calculate sum, note you are using an aggregate function without group by it will result as a single row
SELECT SUM(A_VAL)
FROM (
SELECT
CASE
WHEN COUNT(t.A_INS_NAM) = 10 THEN 1
WHEN COUNT(t.A_INS_NAM) = 20 THEN 2
WHEN COUNT(t.A_INS_NAM) BETWEEN 30 AND 50 THEN 3
WHEN COUNT(t.A_INS_NAM) > 50 THEN 5
ELSE 'some value'
END AS A_VAL
FROM
TABLE1 t
JOIN IWD t1 ON(t.A_INS_NAM = t1.A_INS_NAM)
JOIN TIM t2 ON(t1.IWD = t2.IM_ID)
JOIN TWS t3 ON(t2.IM_ID = t3.T_ID )
WHERE t3.TN = 'abced'
AND t.A_DATE BETWEEN '2014-01-01' AND '2015-05-01'
AND t.A_INS_NAM NOT LIKE '%pk%'
) a
这篇关于MySQL SUM over CASE语句的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文