Oracle 10g多列字符串并置

Question

是否可以构建SQL以连接多行的列值？

下面是一个例子：

表的SQL的

 
PID 
A 
B 
C 

表B

 
PID SEQ Desc 

A  1  Have 
A  2  a nice 
A  3  day. 
B  1  Nice Work. 
C  1  Yes 
C  2  we can 
C  3  do 
C  4  this work! 

输出应该是 -

 
PID Desc 

A  day.||a nice||Have 
B  Nice Work. 
C  this work!||do||we can||Yes 

所以基本上说明列出put table是来自表B的SEQ值的串联，并且这些值以SEQ的降序附加，并且由||来分隔。 ？

SQL的任何帮助？

仅供参考 - 寻找解决方案，而无需使用功能或存储过程

Answer 1

分级查询应该可以工作。由于你想从每个PID的最高SEQ开始，所以需要一些额外的技巧。

SELECT pid, fulldesc FROM (
    SELECT pid, SYS_CONNECT_BY_PATH(desc, '||') fulldesc, seq, minseq FROM (
    SELECT pid, seq, desc, 
      MAX(seq) OVER (PARTITION BY pid) maxseq, 
      MIN(seq) OVER (PARTITION BY pid) minseq 
     FROM tableB 
    ) 
    START WITH seq = maxseq 
    CONNECT BY pid = PRIOR pid AND seq = PRIOR seq - 1 
) 
    WHERE seq = minseq 
    ORDER BY pid 
    ; 

编辑：添加一个过滤器一种方式的要求，在注释：

SELECT pid, fulldesc FROM (
    SELECT pid, SYS_CONNECT_BY_PATH(desc, '||') fulldesc, seq, minseq FROM (
    SELECT pid, seq, desc, 
      MAX(seq) OVER (PARTITION BY pid) maxseq, 
      MIN(seq) OVER (PARTITION BY pid) minseq 
     FROM tableB 
     WHERE pid IN (SELECT pid FROM tableB WHERE desc='day.') 
    ) 
    START WITH seq = maxseq 
    CONNECT BY pid = PRIOR pid AND seq = PRIOR seq - 1 
) 
    WHERE seq = minseq 
    ORDER BY pid 

Answer 2

从here

但是我有一个函数任何一天去。

SQL> select deptno 
    2  , rtrim(ename,',') enames 
    3 from (select deptno 
    4    , ename 
    5    , rn 
    6    from emp 
    7   model 
    8     partition by (deptno) 
    9     dimension by (row_number() over 
10        (partition by deptno order by ename) rn 
11        ) 
12     measures  (cast(ename as varchar2(40)) ename) 
13     rules 
14     (ename[any] order by rn desc = ename[cv()]||','||ename[cv()+1] 
15     ) 
16  ) 
17 where rn = 1 
18 order by deptno 
19/

    DEPTNO ENAMES 
---------- ---------------------------------------- 
     10 CLARK,KING,MILLER 
     20 ADAMS,FORD,JONES,SCOTT,SMITH 
     30 ALLEN,BLAKE,JAMES,MARTIN,TURNER,WARD 

Answer 3

这里有很多关于如何做到这一点的例子（其中一些已经被提到），包括的类似的东西一个完整的实施LISTAGG（）：

http://www.oracle-base.com/articles/misc/StringAggregationTechniques.php#user_defined_aggregate_function

Answer 4

你想干什么奥拉东西请问在MySQL中如何使用GROUP_CONCAT？

您可以使用WM_CONCAT如果存在： http://www.oracle-base.com/articles/misc/string-aggregation-techniques.php#wm_concat 但它没有证件，所以我不会使用在生产，如果我是你。

不幸的是，在10g上没有LISTAGG。

对于10g的生产环境，我会选择Dave Costa的答案。