我有这样的数据库结构:
SELECT * FROM Culture;
------------------------
Id ShortName FullName Supported
22 en-US English (United States) 1
23 fr-FR French (France) 1
24 hi-IN Hindi (India) 0
SELECT * FROM ResourceKey;
----------------------------
Id Name
20572 HowAreYou
20571 Hello
20573 ThisKeyHasUSEnglishValueOnly
SELECT * FROM Strings;
-----------------------
Id CultureId ResourceKeyId ResourceValue
41133 22 20571 Hello
41134 22 20572 How are you?
41135 23 20571 Bonjour
41136 23 20572 Comment allez-vous?
41137 22 20573 This key has US English value only.
SELECT * FROM Category;
------------------------
Id Name
1 JavaScript
SELECT * FROM StringCategory;
------------------------------
Id ResourceKeyId CategoryId
1 20571 1
2 20572 1
3 20573 1
我想显示所有资源键名称和资源值,即针对每个键的字符串值,例如,法国(法国)文化,即具有ShortName
fr-FR的文化,即使键中没有值文化,它必须显示键名,但必须显示NULL。像这样:
Name ResourceValue
-------------------------------------------------------
Hello Bonjour
HowAreYou Comment allez-vous?
ThisKeyHasUSEnglishValueOnly NULL
对我来说,这似乎是一个简单的LEFT OUTER JOIN应用程序,但是我的代码无法正常工作。有人可以帮忙更正我的代码吗?
我的查询是:
SELECT ResourceKey.Name AS Name, ResourceValue
FROM
ResourceKey LEFT OUTER JOIN Strings
ON
Strings.ResourceKeyId = ResourceKey.Id
INNER JOIN StringCategory
ON
StringCategory.ResourceKeyId = Strings.ResourceKeyId
INNER JOIN Category
ON
StringCategory.CategoryId = Category.Id
LEFT OUTER JOIN Culture
ON
Strings.CultureId = Culture.Id AND Culture.Id = (SELECT Id FROM Culture WHERE ShortName = 'fr-FR')
AND
Category.Name = 'JavaScript';
不知何故,上述查询中的最后一个联接变成了内部联接,从而消除了在所述区域性中没有值的那些行。
SELECT a.name, b.ResourceValue
FROM ResourceKey a
LEFT JOIN
(
SELECT b.ResourceKeyID, b.ResourceValue
FROM Strings b
INNER JOIN Culture c
ON b.CultureID = c.ID
WHERE c.shortname = 'fr-FR'
) b ON a.ID = b.ResourceKeyId
更新
使用SSTOBMAY;
SELECT a.name, b.ResourceValue
FROM ResourceKey a
LEFT JOIN
(
SELECT b.ResourceKeyID, b.ResourceValue
FROM Strings b
INNER JOIN Culture c
ON b.CultureID = c.ID
WHERE c.shortname = 'fr-FR'
) b ON a.ID = b.ResourceKeyId
INNER JOIN
StringCategory sc ON
sc.ResourceKeyId = a.Id
INNER JOIN Category c ON c.Id = sc.CategoryId
WHERE c.Name = 'JavaScript';
本文收集自互联网,转载请注明来源。
如有侵权,请联系[email protected] 删除。
我来说两句