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我懷疑這與我在SELECT語句中有case語句並且然後嘗試對此執行GROUP BY和ORDER BY語句的事實有關。SQL條件選擇大小寫邏輯
我有一個基於兩個表之間的連接的結果集。一個是ks2en，ks2ma和Ks2av列值爲2c，2b，2a，3c，3b等的學生表，第二個是每個學生的結果表，例如A +，A，A-，B +等。對ks2en，ks2ma和Ks2av列進行分組，並將結果相加，得出一個總數的網格，其中左下方的水平和上方的結果。然而，三種級別Ks2en，Ks2ma和Ks2av應該基於一個特定的主題，通過結果帶來：
Ks2en - English Result
Ks2ma - Maths Result
Ks2av - Any other subject Result
哪裏有在ks2en，ks2ma或ks2av列沒有價值，我想小組通過向顯示爲'沒有KS2'。
我的代碼在底部對於Ks2en的英語非常出色，但我正在努力根據主題是英語，數學還是其他來改變結果的邏輯。
該主題通過名爲@SubjectName的變量進行填充。
下面是僞代碼，我想我的SQL做的事：
If @SubjectName = 'English' then
If ks2en ='' then
display 'No KS2'
else Ks2en
endif
Else if @SubjectName = 'Mathematics' then
If ks2ma ='' then
display 'No KS2'
else Ks2ma
endif
Else if @SubjectName <> 'English' and @SubjectName <> 'Mathematics' then
If ks2av ='' then
display 'No KS2'
else Ks2av
endif
這是到目前爲止我的代碼是工作時@SubjectName = '英語'：
DECLARE
@DataCollection varchar(50) = '2013/14 - Autumn 1 - Targets',
@StuYear VARCHAR(2) = '11',
@SubjectName varchar(100) ='English',
@TeachingGroup varchar(25) = 'Select All',
@SubGroup varchar(10) = 'Select All'
SELECT CASE WHEN Ks2en = '' and @SubjectName = 'English' THEN 'No KS2' ELSE ks2en END AS 'KS2',
nullif(count(CASE WHEN result = '' THEN 1 END),0) AS 'No Level/Grade',
nullif(count(CASE WHEN result IN ('U', '1a', '1b', '1c') THEN 1 END),0) AS '1/U',
nullif(count(CASE WHEN result IN ('U', '2a', '2b', '2c') THEN 1 END),0) AS '2/U',
nullif(count(CASE WHEN result IN ('G-','3c') THEN 1 END),0) AS '3c/G-',
nullif(count(CASE WHEN result IN ('G', '3b') THEN 1 END),0) AS '3b/G',
nullif(count(CASE WHEN result IN ('G+','3a') THEN 1 END),0) AS '3a/G+',
nullif(count(CASE WHEN result IN('F-','4c') THEN 1 END),0) AS '4c/F-',
nullif(count(CASE WHEN result IN('F', '4b') THEN 1 END),0) AS '4b/F',
nullif(count(CASE WHEN result IN('F+', '4a') THEN 1 END),0) AS '4a/F+',
nullif(count(CASE WHEN result IN('E-', '5c') THEN 1 END),0) AS '5c/E-',
nullif(count(CASE WHEN result IN('E', '5b') THEN 1 END),0) AS '5b/E',
nullif(count(CASE WHEN result IN('E+', '5a') THEN 1 END),0) AS '5a/E+',
nullif(count(CASE WHEN result IN('D-', '6c') THEN 1 END),0) AS '6c/D-',
nullif(count(CASE WHEN result IN('D', '6b') THEN 1 END),0) AS '6b/D',
nullif(count(CASE WHEN result IN('D+', '6a') THEN 1 END),0) AS '6a/D+',
nullif(count(CASE WHEN result IN('C-', '7c') THEN 1 END),0) AS '7c/C-',
nullif(count(CASE WHEN result IN('C', '7b') THEN 1 END),0) AS '7b/C',
nullif(count(CASE WHEN result IN('C+', '7a') THEN 1 END),0) AS '7a/C+',
nullif(count(CASE WHEN result IN('B-', '8c') THEN 1 END),0) AS '8c/B-',
nullif(count(CASE WHEN result IN('B', '8b') THEN 1 END),0) AS '8b/B',
nullif(count(CASE WHEN result IN('B+', '8a') THEN 1 END),0) AS '8a/B+',
nullif(count(CASE result WHEN 'A-' THEN 1 END),0) AS 'A-',
nullif(count(CASE result WHEN 'A' THEN 1 END),0) AS 'A',
nullif(count(CASE result WHEN 'A+' THEN 1 END),0) AS 'A+',
nullif(count(CASE result WHEN 'A*-' THEN 1 END),0) AS 'A*-',
nullif(count(CASE result WHEN 'A*' THEN 1 END),0) AS 'A*'
FROM student JOIN subject
ON subject.upn=student.upn
WHERE
[StuYear] = @StuYear AND
[DataCollection] = @DataCollection AND
[Name] = @SubjectName AND (
@TeachingGroup = 'Select All' OR
[TeachingGroup] = @TeachingGroup
) AND (
@SubGroup = 'Select All' OR
Gender = CASE
WHEN @SubGroup = 'GenF' THEN 'F'
WHEN @SubGroup = 'GenM' THEN 'M'
END
)
GROUP BY ks2en
ORDER BY
CASE WHEN ks2en = 'W' THEN 0 ELSE 1 END,
LEFT(ks2en, 1),
RIGHT(ks2en, 1) DESC
如果@ SubjectName ='Mathematics'然後該語句將有效地執行以下操作：
DECLARE
@DataCollection varchar(50) = '2013/14 - Autumn 1 - Targets',
@StuYear VARCHAR(2) = '11',
@SubjectName varchar(100) ='Mathematics',
@TeachingGroup varchar(25) = 'Select All',
@SubGroup varchar(10) = 'Select All'
SELECT CASE WHEN Ks2ma = '' and @SubjectName = 'Mathematics' THEN 'No KS2' ELSE ks2ma END AS 'KS2',
nullif(count(CASE WHEN result = '' THEN 1 END),0) AS 'No Level/Grade',
**SNIP**
nullif(count(CASE result WHEN 'A*' THEN 1 END),0) AS 'A*'
FROM student JOIN subject
ON subject.upn=student.upn
WHERE
[StuYear] = @StuYear AND
[DataCollection] = @DataCollection AND
[Name] = @SubjectName AND (
@TeachingGroup = 'Select All' OR
[TeachingGroup] = @TeachingGroup
) AND (
@SubGroup = 'Select All' OR
Gender = CASE
WHEN @SubGroup = 'GenF' THEN 'F'
WHEN @SubGroup = 'GenM' THEN 'M'
END
)
GROUP BY ks2ma
ORDER BY
CASE WHEN ks2ma = 'W' THEN 0 ELSE 1 END,
LEFT(ks2ma, 1),
RIGHT(ks2ma, 1) DESC
如果@Subject名稱等於別的如科學，藝術或技術，則SQL會想以下幾點：
DECLARE
@DataCollection varchar(50) = '2013/14 - Autumn 1 - Targets',
@StuYear VARCHAR(2) = '11',
@SubjectName varchar(100) ='Science',
@TeachingGroup varchar(25) = 'Select All',
@SubGroup varchar(10) = 'Select All'
SELECT CASE WHEN Ks2av = '' and @SubjectName <> 'Mathematics' and @SubjectName <> 'English' THEN 'No KS2' ELSE ks2av END AS 'KS2',
nullif(count(CASE WHEN result = '' THEN 1 END),0) AS 'No Level/Grade',
**SNIP**
nullif(count(CASE result WHEN 'A*' THEN 1 END),0) AS 'A*'
FROM student JOIN subject
ON subject.upn=student.upn
WHERE
[StuYear] = @StuYear AND
[DataCollection] = @DataCollection AND
[Name] = @SubjectName AND (
@TeachingGroup = 'Select All' OR
[TeachingGroup] = @TeachingGroup
) AND (
@SubGroup = 'Select All' OR
Gender = CASE
WHEN @SubGroup = 'GenF' THEN 'F'
WHEN @SubGroup = 'GenM' THEN 'M'
END
)
GROUP BY ks2av
ORDER BY
CASE WHEN ks2av = 'W' THEN 0 ELSE 1 END,
LEFT(ks2av, 1),
RIGHT(ks2av, 1) DESC
我的SQL生成網格類似於以下。結果集將看看SMAE但後臺數據將基於上述不同的標準，並會在每個小區產生不同的總計：
KS2 No Result 1/U 2/U 3c/G- 3b/G 3a/G+ 4c/F- 4b/F **snip**
No KS2 1 NULL NULL NULL NULL NULL NULL **snip**
2a NULL NULL NULL NULL NULL NULL 2 1 **snip**
3c 1 NULL NULL NULL NULL NULL NULL NULL **snip**
3b NULL NULL NULL NULL NULL NULL 1 NULL **snip**
3a 1 NULL NULL NULL NULL NULL NULL NULL **snip**
4c NULL 1 1 NULL NULL NULL NULL NULL **snip**
4b NULL NULL NULL NULL NULL NULL NULL NULL **snip**
4a NULL 1 1 NULL NULL NULL NULL NULL **snip**
5c NULL NULL NULL NULL NULL NULL NULL NULL **snip**
5b NULL NULL NULL NULL NULL NULL NULL NULL **snip**
「*** g^- ***」 ???哇，你有一些艱難的評分。 – RBarryYoung