我得到零除错误，我不知道如何处理它。使用sql server数据库。
脚本：
SELECT Race ,
[2012] = MAX(CASE WHEN a.[Year] = 2012 THEN [Count]
END) ,
[% Inc Dec] = ( MAX(CAST(CASE WHEN a.[Year] IS NULL THEN ''
ELSE a.[Year] = 2011 THEN [Count]
END AS FLOAT))
- MAX(CAST(CASE WHEN a.[Year] IS NULL THEN ''
ELSE a.[Year] = 2012 THEN [Count]
END AS FLOAT)) )
/ MAX(CAST(CASE WHEN a.[Year] IS NULL THEN ''
ELSE a.[Year] = 2012 THEN [Count]
END AS FLOAT)) ,
[2011] = MAX(CASE WHEN a.[Year] = 2011 THEN [Count]
END) ,
[% Inc Dec] = ( MAX(CAST(CASE WHEN a.[Year] = 2010 THEN [Count]
END AS FLOAT))
- MAX(CAST(CASE WHEN a.[Year] = 2011 THEN [Count]
END AS FLOAT)) )
/ MAX(CAST(CASE WHEN a.[Year] = 2010 THEN [Count]
END AS FLOAT)) ,
[2010] = MAX(CASE WHEN a.[Year] = 2010 THEN [Count]
END) ,
[2009] = MAX(CASE WHEN a.[Year] = 2009 THEN [Count]
END) ,
[% Inc Dec] = ( MAX(CAST(CASE WHEN a.[Year] = 2008 THEN [Count]
END AS FLOAT))
- MAX(CAST(CASE WHEN a.[Year] = 2009 THEN [Count]
END AS FLOAT)) )
/ MAX(CAST(CASE WHEN a.[Year] = 2009 THEN [Count]
END AS FLOAT))
FROM @Data
我试图改变前两个案例陈述，但这是不正确的。任何帮助或推动正确的方向将不胜感激。
答案 0 :(得分：2)
我假设a是@Data的别名，或者它与race和[count]位于同一个表/源中，因此您的数据如下所示：
race YEAR COUNT
w 2012 10
w 2011 50
w 2010 100
b 2010 200
b 2009 75
并且您希望数据随着时间的推移而减少。我会使用自我加入来确保高年级和低年级都有值，然后再减去和除，这样：
SELECT
race,
y1.[YEAR] AS yr1, y1.[COUNT] AS cnt1,
y2.[YEAR] AS yr2, y2.[COUNT] AS cnt2,
(cnt2 - cnt1) / cnt1 AS pct_inc_dec
FROM
@DATA y1 INNER JOIN
@DATA y2 ON
y1.race = y2.race AND
y1.YEAR = y2.YEAR - 1 -- y1 is the later year
然后你不必担心除零，除非计数本身为零。
使用您提供的代码，然后，在cross apply的pivot之后，将在存储的表上应用自联接。你可以结合你年龄较大的标准，这样它就不必进入自己的表格了：
DECLARE @DATA TABLE
(
[YEAR] INT ,
[COUNT] INT ,
race VARCHAR(50)
)
INSERT INTO @DATA
SELECT
Race ,[COUNT], [YEAR]
FROM
(SELECT
dt.YEAR AS YEAR ,
SUM(ISNULL(caucasian_enrollment, 0)) AS caucasian ,
SUM(ISNULL(black_or_african_american_enrollment, 0)) AS Black ,
SUM(ISNULL(asian_enrollment,0)) AS Asian ,
SUM(ISNULL(native_hawaiian_pacific_islander_enrollment, 0)) AS Native ,
SUM(ISNULL(hispanic_enrollment, 0)) AS Hispanic ,
SUM(ISNULL(american_indian_or_alaskan_ative_enrollment, 0)) AS [American Indian] ,
SUM(ISNULL(multiracial_enrollment, 0)) AS multiracial ,
SUM(ISNULL(unknown_ethnicity_enrollment, 0)) AS UNKNOWN ,
SUM(ISNULL(male_enrollment, 0)) AS male,
SUM(ISNULL(female_enrollment, 0)) AS female,
SUM(ISNULL(Total_Enrollment, 0)) AS [Total Enrollment]
FROM
mart.dbo.f_s AS fes
INNER JOIN TIME AS dt ON fes.time_key = dt.time_key
WHERE
YEAR = '2012'
GROUP BY
dt.YEAR
UNION ALL
SELECT
dt.YEAR AS YEAR ,
SUM(ISNULL(caucasian_enrollment, 0)) AS caucasian ,
SUM(ISNULL(black_or_african_american_enrollment, 0)) AS Black ,
SUM(ISNULL(asian_enrollment,0)) AS Asian ,
SUM(ISNULL(native_hawaiian_pacific_islander_enrollment, 0)) AS Native,
SUM(ISNULL(hispanic_enrollment, 0)) AS Hispanic,
SUM(ISNULL(american_indian_or_alaskan_ative_enrollment, 0)) AS [American Indian] ,
SUM(ISNULL(multiracial_enrollment, 0)) AS multiracial,
SUM(ISNULL(unknown_ethnicity_enrollment, 0)) AS UNKNOWN,
SUM(ISNULL(male_enrollment, 0)) AS male ,
SUM(ISNULL(female_enrollment, 0)) AS female,
SUM(ISNULL(Total_Enrollment, 0)) AS [Total Enrollment]
FROM
F5A_education_mart_IAK12.dbo.fact_enrollment_school AS fes
INNER JOIN dim_time AS dt ON fes.time_key = dt.time_key
WHERE
YEAR <= '2011' AND YEAR >= '2008'
GROUP BY
dt.YEAR
) d CROSS APPLY
( VALUES
( 'Caucasian', caucasian, [YEAR])
, ( 'Black', Black, [YEAR])
, ( 'Asian', Asian, [YEAR])
, ('Native', Native, [YEAR])
, ('Hispanic', Hispanic, [YEAR])
, ('American Indian', [American Indian], [YEAR])
, ('Multiracial', multiracial, [YEAR])
, ('Unkown', UNKNOWN, [YEAR])
, ('Male', male, [YEAR])
, ('Female', female, [YEAR])
, ('Total Enrollment', [Total Enrollment], [YEAR])
) a ( Race, [COUNT], [YEAR] )
GROUP BY
Race
SELECT
race,
y1.[YEAR] AS yr1, y1.[COUNT] AS cnt1,
y2.[YEAR] AS yr2, y2.[COUNT] AS cnt2,
(cnt2 - cnt1) / cnt1 AS pct_inc_dec
FROM
@DATA y1 INNER JOIN
@DATA y2 ON
y1.race = y2.race AND
y1.YEAR = y2.YEAR - 1 -- y1 is the later year
答案 1 :(得分：0)
感谢T I和Martin的快速回应。最初我没有发布完整的脚本，因为我只是遇到了我的case语句的问题，我无法让ISNULL工作。以下是完整的结果和答案：
DECLARE @Data TABLE
(
[Year] INT ,
caucasian INT ,
Black INT ,
Asian INT ,
Native INT ,
Hispanic INT ,
[American Indian] INT ,
Multiracial INT ,
UNKNOWN INT ,
Male INT ,
Female INT ,
[Total Enrollment] INT
)
INSERT INTO @Data
SELECT dt.year AS Year ,
SUM(ISNULL(caucasian_enrollment, 0)) ,
SUM(ISNULL(black_or_african_american_enrollment, 0)) ,
SUM(ISNULL(asian_enrollment,0)) ,
SUM(ISNULL(native_hawaiian_pacific_islander_enrollment, 0)) ,
SUM(ISNULL(hispanic_enrollment, 0)) ,
SUM(ISNULL(american_indian_or_alaskan_ative_enrollment, 0)) ,
SUM(ISNULL(multiracial_enrollment, 0)) ,
SUM(ISNULL(unknown_ethnicity_enrollment, 0)) ,
SUM(ISNULL(male_enrollment, 0)) ,
SUM(ISNULL(female_enrollment, 0)) ,
SUM(ISNULL(Total_Enrollment, 0))
FROM mart.dbo.f_s AS fes
INNER JOIN time AS dt ON fes.time_key = dt.time_key
LEFT OUTER JOIN building AS db ON fes.building_key = db.building_key
WHERE year = '2012'
GROUP BY dt.year
UNION ALL
SELECT dt.year AS Year ,
SUM(ISNULL(caucasian_enrollment, 0)) ,
SUM(ISNULL(black_or_african_american_enrollment, 0)) ,
SUM(ISNULL(asian_enrollment,0)) ,
SUM(ISNULL(native_hawaiian_pacific_islander_enrollment, 0)) ,
SUM(ISNULL(hispanic_enrollment, 0)) ,
SUM(ISNULL(american_indian_or_alaskan_ative_enrollment, 0)) ,
SUM(ISNULL(multiracial_enrollment, 0)) ,
SUM(ISNULL(unknown_ethnicity_enrollment, 0)) ,
SUM(ISNULL(male_enrollment, 0)) ,
SUM(ISNULL(female_enrollment, 0)) ,
SUM(ISNULL(Total_Enrollment, 0))
FROM F5A_education_mart_IAK12.dbo.fact_enrollment_school AS fes
INNER JOIN dim_time AS dt ON fes.time_key = dt.time_key
LEFT OUTER JOIN dim_building AS db ON fes.building_key = db.building_key
WHERE year = '2011'
GROUP BY dt.year
UNION ALL
SELECT dt.year AS Year ,
SUM(ISNULL(caucasian_enrollment, 0)) ,
SUM(ISNULL(black_or_african_american_enrollment, 0)) ,
SUM(ISNULL(asian_enrollment,0)) ,
SUM(ISNULL(native_hawaiian_pacific_islander_enrollment, 0)) ,
SUM(ISNULL(hispanic_enrollment, 0)) ,
SUM(ISNULL(american_indian_or_alaskan_ative_enrollment, 0)) ,
SUM(ISNULL(multiracial_enrollment, 0)) ,
SUM(ISNULL(unknown_ethnicity_enrollment, 0)) ,
SUM(ISNULL(male_enrollment, 0)) ,
SUM(ISNULL(female_enrollment, 0)) ,
SUM(ISNULL(Total_Enrollment, 0))
FROM F5A_education_mart_IAK12.dbo.fact_enrollment_school AS fes
INNER JOIN dim_time AS dt ON fes.time_key = dt.time_key
LEFT OUTER JOIN dim_building AS db ON fes.building_key = db.building_key
WHERE year = '2010'
GROUP BY dt.year
UNION ALL
SELECT dt.year AS Year ,
SUM(ISNULL(caucasian_enrollment, 0)) ,
SUM(ISNULL(black_or_african_american_enrollment, 0)) ,
SUM(ISNULL(asian_enrollment,0)) ,
SUM(ISNULL(native_hawaiian_pacific_islander_enrollment, 0)) ,
SUM(ISNULL(hispanic_enrollment, 0)) ,
SUM(ISNULL(american_indian_or_alaskan_ative_enrollment, 0)) ,
SUM(ISNULL(multiracial_enrollment, 0)) ,
SUM(ISNULL(unknown_ethnicity_enrollment, 0)) ,
SUM(ISNULL(male_enrollment, 0)) ,
SUM(ISNULL(female_enrollment, 0)) ,
SUM(ISNULL(Total_Enrollment, 0))
FROM F5A_education_mart_IAK12.dbo.fact_enrollment_school AS fes
INNER JOIN dim_time AS dt ON fes.time_key = dt.time_key
LEFT OUTER JOIN dim_building AS db ON fes.building_key = db.building_key
WHERE year = '2009'
GROUP BY dt.year
UNION ALL
SELECT dt.year AS Year ,
SUM(ISNULL(caucasian_enrollment, 0)) ,
SUM(ISNULL(black_or_african_american_enrollment, 0)) ,
SUM(ISNULL(asian_enrollment,0)) ,
SUM(ISNULL(native_hawaiian_pacific_islander_enrollment, 0)) ,
SUM(ISNULL(hispanic_enrollment, 0)) ,
SUM(ISNULL(american_indian_or_alaskan_ative_enrollment, 0)) ,
SUM(ISNULL(multiracial_enrollment, 0)) ,
SUM(ISNULL(unknown_ethnicity_enrollment, 0)) ,
SUM(ISNULL(male_enrollment, 0)) ,
SUM(ISNULL(female_enrollment, 0)) ,
SUM(ISNULL(Total_Enrollment, 0))
FROM F5A_education_mart_IAK12.dbo.fact_enrollment_school AS fes
INNER JOIN dim_time AS dt ON fes.time_key = dt.time_key
LEFT OUTER JOIN dim_building AS db ON fes.building_key = db.building_key
WHERE year = '2008'
GROUP BY dt.year
--Race 2012 % inc/dec 2011 % inc/dec 2010
--Caucasian 3000 -.33 4000 .6 2500
--Black 1000 -.5 2000 .25 1500
--Asian 100 .5 50 .4 30
SELECT Race ,
[2012] = MAX(CASE WHEN a.[Year] = 2012 THEN [Count]
END) ,
[% Inc Dec] = ( MAX(CAST(CASE WHEN a.[Year] = 2011 THEN [Count]
END AS FLOAT))
- MAX(CAST(CASE WHEN a.[Year] = 2012 THEN [Count]
END AS FLOAT)) )
/ NULLIF(MAX(CAST(CASE WHEN a.[Year] = 2012 THEN [Count]
END AS FLOAT)),0) ,
[2011] = MAX(CASE WHEN a.[Year] = 2011 THEN [Count]
END) ,
[% Inc Dec] = ( MAX(CAST(CASE WHEN a.[Year] = 2010 THEN [Count]
END AS FLOAT))
- MAX(CAST(CASE WHEN a.[Year] = 2011 THEN [Count]
END AS FLOAT)) )
/ NULLIF(MAX(CAST(CASE WHEN a.[Year] = 2010 THEN [Count]
END AS FLOAT)),0) ,
[2010] = MAX(CASE WHEN a.[Year] = 2010 THEN [Count]
END) ,
[% Inc Dec] = ( MAX(CAST(CASE WHEN a.[Year] = 2009 THEN [Count]
END AS FLOAT))
- MAX(CAST(CASE WHEN a.[Year] = 2010 THEN [Count]
END AS FLOAT)) )
/ NULLIF(MAX(CAST(CASE WHEN a.[Year] = 2009 THEN [Count]
END AS FLOAT)),0) ,
[2009] = MAX(CASE WHEN a.[Year] = 2009 THEN [Count]
END) ,
[% Inc Dec] = ( MAX(CAST(CASE WHEN a.[Year] = 2008 THEN [Count]
END AS FLOAT))
- MAX(CAST(CASE WHEN a.[Year] = 2009 THEN [Count]
END AS FLOAT)) )
/ NULLIF(MAX(CAST(CASE WHEN a.[Year] = 2009 THEN [Count]
END AS FLOAT)), 0)
FROM @Data
CROSS APPLY ( VALUES
( 'Caucasian', caucasian, [Year])
, ( 'Black', Black, [Year])
, ( 'Asian', Asian, [Year])
, ('Native', Native, [Year])
, ('Hispanic', Hispanic, [Year])
, ('American Indian', [American Indian], [Year])
, ('Multiracial', multiracial, [Year])
, ('Unkown', unknown, [Year])
, ('Male', male, [Year])
, ('Female', female, [Year])
, ('Total Enrollment', [Total Enrollment], [Year])
) a ( Race, [Count], [Year] ) GROUP BY Race