我需要帮助才能获得正确的输出。我有一个费用类别（1个表格，主要类别如“医疗”）和相关的费用子类别（如“检查”，“治疗”等）。这些由pcatid和pcatid_fk绑在一起。通过引用类别（pcatid_fk）和子类别（psubcatid_fk）对persexpenses进行条目。我的查询产生一个结果，其中费用金额显示在显示类别+子类别的每一行中。
在这个例子中，我已经在4月份参加了500美元的考试。这是输出的样子：
Category Subcategory Jan Feb April
Medical Exam NULL NULL 500.000
Medical Therapy NULL NULL 500.000
Medical Test NULL NULL 500.000
它应该是什么样子：
Category Subcategory Jan Feb April
Medical Exam NULL NULL 500.000
Medical Therapy NULL NULL NULL
Medical Test NULL NULL NULL
到目前为止，这是我的查询：
SELECT Isnull(second.pcategory, 0) AS CATEGORY,
Isnull(third.psubcategory, 0) AS SUBCATEGORY,
Isnull(first.jan, 0) AS JAN,
Isnull(first.feb, 0) AS FEB,
Isnull(first.mar, 0) AS MAR,
Isnull(first.apr, 0) AS APR,
Isnull(first.may, 0) AS MAY,
Isnull(first.jun, 0) AS JUN,
Isnull(first.jul, 0) AS JUL,
Isnull(first.aug, 0) AS AUG,
Isnull(first.sep, 0) AS SEP,
Isnull(first.oct, 0) AS OCT,
Isnull(first.nov, 0) AS NOV,
Isnull(first.dec, 0) AS DEC,
Isnull(first.q1, 0) AS Q1,
Isnull(first.q2, 0) AS Q2,
Isnull(first.q3, 0) AS Q3,
Isnull(first.q4, 0) AS Q4,
Isnull(first.annual, 0) AS ANNUAL
FROM (SELECT pcategory,
pcatid
FROM sky.dbo.persexpcategories) second
LEFT JOIN (SELECT psubcategory,
pcatid_fk
FROM sky.dbo.persexpsubcat) third
ON second.pcatid = third.pcatid_fk
LEFT JOIN (SELECT pcategory,
Isnull(Sum(CASE
WHEN Month(pexpdate) = '1' THEN pexpamount
END), 0) AS 'jan',
Isnull(Sum(CASE
WHEN Month(pexpdate) = '2' THEN pexpamount
END), 0) AS 'feb',
Isnull(Sum(CASE
WHEN Month(pexpdate) = '3' THEN pexpamount
END), 0) AS 'mar',
Isnull(Sum(CASE
WHEN Month(pexpdate) = '4' THEN pexpamount
END), 0) AS 'apr',
Isnull(Sum(CASE
WHEN Month(pexpdate) = '5' THEN pexpamount
END), 0) AS 'may',
Isnull(Sum(CASE
WHEN Month(pexpdate) = '6' THEN pexpamount
END), 0) AS 'jun',
Isnull(Sum(CASE
WHEN Month(pexpdate) = '7' THEN pexpamount
END), 0) AS 'jul',
Isnull(Sum(CASE
WHEN Month(pexpdate) = '8' THEN pexpamount
END), 0) AS 'aug',
Isnull(Sum(CASE
WHEN Month(pexpdate) = '9' THEN pexpamount
END), 0) AS 'sep',
Isnull(Sum(CASE
WHEN Month(pexpdate) = '10' THEN
pexpamount
END), 0) AS 'oct',
Isnull(Sum(CASE
WHEN Month(pexpdate) = '11' THEN
pexpamount
END), 0) AS 'nov',
Isnull(Sum(CASE
WHEN Month(pexpdate) = '12' THEN
pexpamount
END), 0) AS 'dec',
Isnull(Sum(CASE
WHEN Month(pexpdate) BETWEEN '1' AND '3'
THEN
pexpamount
END), 0) AS 'Q1',
Isnull(Sum(CASE
WHEN Month(pexpdate) BETWEEN '4' AND '6'
THEN
pexpamount
END), 0) AS 'Q2',
Isnull(Sum(CASE
WHEN Month(pexpdate) BETWEEN '7' AND '9'
THEN
pexpamount
END), 0) AS 'Q3',
Isnull(Sum(CASE
WHEN Month(pexpdate) BETWEEN '10' AND '12'
THEN
pexpamount
END), 0) AS 'Q4',
Isnull(Sum(CASE
WHEN Month(pexpdate) BETWEEN '1' AND '12'
THEN
pexpamount
END), 0) AS 'annual'
FROM sky.dbo.users
LEFT JOIN sky.dbo.persexpenses
ON userid = userid_fk
LEFT JOIN sky.dbo.persexpcategories
ON pcatid_fk = pcatid
WHERE userid = '1'
GROUP BY pcategory) first
ON second.pcategory = first.pcategory
表格/ [字段]是：
persexpenses
persexpcategories
persexpsubcat
答案 0 :(得分：1)
尝试这样的事情，我已经对表进行了修改但不确定哪个列来自哪些表，因此如果不明确，您还需要使用带有列名的别名。
SELECT
PC.pcategory AS CATEGORY,
PSC.psubcategory AS SUBCATEGORY,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 1 THEN pexpamount ELSE NULL END), 0) AS JAN,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 2 THEN pexpamount ELSE NULL END), 0) AS FEB,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 3 THEN pexpamount ELSE NULL END), 0) AS MAR,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 4 THEN pexpamount ELSE NULL END), 0) AS APR,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 5 THEN pexpamount ELSE NULL END), 0) AS MAY,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 6 THEN pexpamount ELSE NULL END), 0) AS JUN,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 7 THEN pexpamount ELSE NULL END), 0) AS JUL,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 8 THEN pexpamount ELSE NULL END), 0) AS AUG,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 9 THEN pexpamount ELSE NULL END), 0) AS SEP,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 10 THEN pexpamount ELSE NULL END), 0)AS OCT,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 11 THEN pexpamount ELSE NULL END), 0)AS NOV,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 12 THEN pexpamount ELSE NULL END), 0)AS DEC,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 1 OR MONTH(pexpdate) = 2 OR
MONTH(pexpdate) = 3 THEN pexpamount ELSE NULL END), 0) AS Q1,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 4 OR MONTH(pexpdate) = 5 OR
MONTH(pexpdate) = 6 THEN pexpamount ELSE NULL END), 0) AS Q2,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 7 OR MONTH(pexpdate) = 8 OR
MONTH(pexpdate) = 9 THEN pexpamount ELSE NULL END), 0) AS Q3,
Isnull(SUM(CASE WHEN MONTH(pexpdate) = 10 OR MONTH(pexpdate) = 11 OR
MONTH(pexpdate) = 12 THEN pexpamount ELSE NULL END), 0) AS Q4,
Isnull(SUM(pexpamount), 0) AS ANNUAL
FROM psersexpenses P LEFT JOIN sky.dbo.persexpcategories PC
ON P.pcatid = PC.pcatid
LEFT JOIN sky.dbo.persexpsubcat PSC
ON P.psubcatid_fk = PSC.psubcatid
GROUP BY PC.pcategory,PSC.psubcategory