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TABLE dbo_R5PERSONNEL
column PER_DESC
Do, John 
Jones, Jacky

TABLE dbo_R5USERS
column USR_DESC
John Do
Jack Jones

问：如何连接这两个表以从表 dbo_R5USERS 中获取表 dbo_R5PERSONNEL 的列 PER_DESC 中的所有 USR_DESC。

我使用字符串操作来大写和提取每个表中的姓氏

SELECT UCASE(MID(TRIM(dbo_R5USERS.USR_DESC),  INSTR(TRIM(dbo_R5USERS.USR_DESC), ' ') + 1, LEN(TRIM(dbo_R5USERS.USR_DESC)) - INSTR(TRIM(dbo_R5USERS.USR_DESC), ' '))) AS LastName
FROM dbo_R5USERS
WHERE dbo_R5USERS.USR_ACTIVE = '+'
ORDER BY dbo_R5USERS.USR_DESC;


SELECT UCASE(MID(TRIM(dbo_R5PERSONNEL.PER_DESC),1,INSTR(TRIM(dbo_R5PERSONNEL.PER_DESC),',')-1)) AS LastName
FROM dbo_R5PERSONNEL
WHERE dbo_R5PERSONNEL.PER_NOTUSED='+'
ORDER BY dbo_R5PERSONNEL.PER_DESC;

我将如何在这两个子查询中加入 JOIN？还有其他方法可以达到我想要的结果吗？

提前致谢！

更新1：

SELECT R.LastName
    , P.LastName FROM 
(
    SELECT UCASE(MID(TRIM(dbo_R5USERS.USR_DESC)
        , INSTR(TRIM(dbo_R5USERS.USR_DESC), ' ') + 1, LEN(TRIM(dbo_R5USERS.USR_DESC)) - INSTR(TRIM(dbo_R5USERS.USR_DESC), ' '))) AS LastName 
    FROM dbo_R5USERS 
    WHERE dbo_R5USERS.USR_ACTIVE = '+'
) R 
INNER JOIN 
( 
    SELECT UCASE(MID(TRIM(dbo_R5PERSONNEL.PER_DESC),1,INSTR(TRIM(dbo_R5PERSONNEL.PER_DESC),‌​',')-1)) AS LastName 
    FROM dbo_R5PERSONNEL 
    WHERE dbo_R5PERSONNEL.PER_NOTUSED='+'
) P 
    ON R.LastName = P.LastName
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0 回答 0