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我正在尝试弄清楚如何为州缩写添加别名。
示例:
查询:
SELECT DISTINCT CHAPTER, COUNT(CHAPTER)AS MEMBERS
FROM Name
WHERE MEMBER_RECORD = '1'
AND COUNTRY in ('',' ','United States')
AND CHAPTER IN
('AL',
'AK',
'AZ')
我想将完整的州名称添加到 AL、AK 和 AZ。
例子:
AND CHAPTER IN
('AL' AS 'ALABAMA',
'AK' AS 'ALASKA',
'AZ' AS 'ARIZONA')
最佳答案
您可以使用 CASE
表达式:
SELECT CASE
WHEN CHAPTER = 'AL' THEN 'ALABAMA'
WHEN CHAPTER = 'AK' THEN 'ALASKA'
WHEN CHAPTER = 'AZ' THEN 'ARIZONA'
END AS CHAPTER,
COUNT(*) AS MEMBERS
FROM Name
WHERE MEMBER_RECORD = '1'
AND COUNTRY in ('',' ','United States')
AND CHAPTER IN ('AL','AK','AZ')
GROUP BY CASE
WHEN CHAPTER = 'AL' THEN 'ALABAMA'
WHEN CHAPTER = 'AK' THEN 'ALASKA'
WHEN CHAPTER = 'AZ' THEN 'ARIZONA'
END;
但我建议您创建一个别名表并使用它执行JOIN
:
SELECT A.CHAPTERNAME,
COUNT(*) AS MEMBERS
FROM dbo.Name AS N
LEFT JOIN dbo.Aliases AS A
ON N.CHAPTER = A.CHAPTER
WHERE MEMBER_RECORD = '1'
AND COUNTRY in ('',' ','United States')
AND CHAPTER IN ('AL','AK','AZ')
GROUP BY A.CHAPTERNAME;
关于sql - 在 SQL 的 WHERE 语句中添加别名,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31655753/
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