Question

所以我有两个问题：

查询1：

SELECT        
a.memno, 
a.name, 
a.addr1, 
a.addr2, 
a.city, 
a.state, 
a.zip, 
a.sex, 
a.lname, 
a.ssan, 
b.addr1 AS old_addr1, 
b.addr2 AS old_addr2, 
b.city AS old_city, 
b.state AS old_state, 
b.zip AS old_zip

FROM            LIB1.TABLE1 a, LIB2.TABLE2 b

WHERE        (a.memno = b.memno) AND 

(b.groupid = 'P2') AND 
(b.type = 'B') AND 
(b.datec = 20131203) AND 
(a.addr1 <> b.addr1) AND 
(a.addr2 <> b.addr2) AND 
(a.city <> b.city) AND 
(a.state <> b.state) AND 
(a.zip <> b.zip)

ORDER BY b.timec DESC

返回1条记录。

查询2：

SELECT        
a.memno, 
a.name, 
a.addr1, 
a.addr2, 
a.city, 
a.state, 
a.zip, 
a.sex, 
a.lname, 
a.ssan, 
b.addr1 AS old_addr1, 
b.addr2 AS old_addr2, 
b.city AS old_city, 
b.state AS old_state, 
b.zip AS old_zip

FROM            LIB2.TABLE1 a, LIB2.TABLE2 b

WHERE        (a.memno = b.memno) AND 
(b.groupid = 'N2') AND 
(b.type = 'B') AND 
(b.datec = 20131203) AND 
(a.addr1 <> b.addr1) AND 
(a.addr2 <> b.addr2) AND 
(a.city <> b.city) AND 
(a.state <> b.state) AND 
(a.zip <> b.zip)

ORDER BY b.timec DESC

返回2条记录。

我正在尝试使用UNION让这两个查询返回1个结果集。

尝试UNION ：

SELECT        
a.memno, 
a.name, 
a.addr1, 
a.addr2, 
a.city, 
a.state, 
a.zip, 
a.sex, 
a.lname, 
a.ssan, 
b.addr1 AS old_addr1, 
b.addr2 AS old_addr2, 
b.city AS old_city, 
b.state AS old_state, 
b.zip AS old_zip

FROM            LIB1.TABLE1 a, LIB2.TABLE2 b

WHERE        (a.memno = b.memno) AND 

(b.groupid = 'P2') AND 
(b.type = 'B') AND 
(b.datec = 20131203) AND 
(a.addr1 <> b.addr1) AND 
(a.addr2 <> b.addr2) AND 
(a.city <> b.city) AND 
(a.state <> b.state) AND 
(a.zip <> b.zip)

UNION

SELECT        
a.memno, 
a.name, 
a.addr1, 
a.addr2, 
a.city, 
a.state, 
a.zip, 
a.sex, 
a.lname, 
a.ssan, 
b.addr1 AS old_addr1, 
b.addr2 AS old_addr2, 
b.city AS old_city, 
b.state AS old_state, 
b.zip AS old_zip

FROM            LIB2.TABLE1 a, LIB2.TABLE2 b

WHERE        (a.memno = b.memno) AND 
(b.groupid = 'N2') AND 
(b.type = 'B') AND 
(b.datec = 20131203) AND 
(a.addr1 <> b.addr1) AND 
(a.addr2 <> b.addr2) AND 
(a.city <> b.city) AND 
(a.state <> b.state) AND 
(a.zip <> b.zip)

ORDER BY timec DESC

这给了我：

'DESC'附近的WHERE子句出错。无法解析查询文本。

其次是：

SQL执行错误。

执行的SQL语句：SELECT a.memno，a.name，a.addr1，a.addr2，a.city，a.state，a.zip，a.sex，a.lname，a.ssan ，b.addr1 AS old_addr1，b.addr2 AS old_addr2，b.city AS old_city， b.state AS old_state，b.zip AS old_zip FROM LIB1.TABLE1 a，LIB2.TABLE2 b 在哪里（a.mem ......

错误来源：CWBODB.DLL

错误消息：ERROR [42000] [IBM] [System i Access ODBC Driver] [DB2 for i5 / OS] SQL0199 - 不期望关键字DESC。有效令牌：除了优化之外，跳过WTIH FETCH ORDER UNION。

修改

Bangs Head 无法相信我错过了我在第一次查询结束时仍然'desc'。在第一个查询结束时摆脱'desc'之后，我现在得到了同样的错误，但是消息：列TIMEC不能被限定。

EDIT2：

消息：ORDER BY列TIMEC或表达式不在结果表中。

Answer 1

首次查询联合，您在最后一行的末尾留下了desc：

WHERE a.memno [...snip...] <> b.zipc desc  
                                     ^^^^

...这正是错误消息所说的。只是因为你可以在查询结尾看到（有效）DESC，并不意味着在其他地方不能有desc ...当你的查询是一个时尤其如此几英里宽。

Answer 2

对于您的第一个DESC子句中的流氓WHERE，ORDER BY适用于生成的联合（没有timec列），而不是源数据集。

您可以将两个查询合并为子查询：

SELECT * FROM
    (SELECT a.memno, a.name, 
            a.addr1, a.addr2, a.city, a.state, a.zip, a.sex, a.lname, a.ssan, 
            b.addr1 as old_addr1, b.addr2 as old_addr2, b.city as old_city, b.state as old_state, b.zip as old_zip 
    FROM LIB1.TABLE1 a, LIB1.TABLE2 b 
    WHERE a.memno = b.memno 
      and b.groupid = 'P2' 
      and b.type = 'B' 
      and b.datec =  20131205 
      AND a.addr1 <> b.addr1 
      AND a.addr2 <> b.addr2 
      AND a.city <> b.city 
      AND a.state <> b.state 
      AND a.zip <> b.zipc 
    ORDER BY b.timec desc  
    ) A
UNION
SELECT * FROM    
    (
    SELECT a.memno, a.name, 
           a.addr1, a.addr2, a.city, a.state, a.zip, a.sex, a.lname, a.ssan, 
           b.addr1 as old_addr1, b.addr2 as old_addr2, b.city as old_city, b.state as old_state, b.zip as old_zip 
    FROM LIB2.TABLE1 a, LIB2.TABLE2 b 
    WHERE a.memno = b.memno 
      and b.groupid = 'N2' 
      and b.type = 'B' 
      and b.datec = 20131205 
      AND a.addr1 <> b.addr1 
      AND a.addr2 <> b.addr2 
      AND a.city <> b.city 
      AND a.state <> b.state 
      AND a.zip <> b.zip 
    ORDER BY b.timec desc
    ) B

ORDER BY列TIMEC或表达式不在结果表中？

2 个答案: