ORACLE多行记录合并为一行记录

多行记录合并为一行记录

wn_concat() 函数

其函数在Oracle 10g推出，在10g版本中，返回字符串类型，在11g版本中返回clob类型。括号里面的参数是列，而且可以是多个列的集合，也就是说在括号里面可以自由地用‘||’合并字符串。

普通函数

select wm_concat(ename) ename from emp;

ENAME
--------------------------------------------------------------------------------
SMITH,ALLEN,WARD,JONES,MARTIN,BLAKE,CLARK,SCOTT,KING,TURNER,ADAMS,JAMES,FORD,MILLER

分组函数

select deptno,wm_concat(ename) ename  from emp group by deptno;

      DEPTNO       ENAME
--------------------------------------------------------------------------------
        10    CLARK,MILLER,KING

        20    SMITH,FORD,ADAMS,SCOTT,JONES

        30    ALLEN,JAMES,TURNER,BLAKE,MARTIN,WARD

分析函数

SQL> select deptno,ename,sal,wm_concat(ename) over(partition by deptno) name  from emp;

    DEPTNO ENAME             SAL   NAME
--------------------------------------------------------------------------------
        10 CLARK            2450   CLARK,KING,MILLER
        10 KING             5000   CLARK,KING,MILLER
        10 MILLER           1300   CLARK,KING,MILLER
        20 JONES            2975   JONES,FORD,ADAMS,SMITH,SCOTT
        20 FORD             3000   JONES,FORD,ADAMS,SMITH,SCOTT
        20 ADAMS            1100   JONES,FORD,ADAMS,SMITH,SCOTT
        20 SMITH             800   JONES,FORD,ADAMS,SMITH,SCOTT
        20 SCOTT            3000   JONES,FORD,ADAMS,SMITH,SCOTT
        30 WARD             1250   WARD,TURNER,ALLEN,JAMES,BLAKE,MARTIN
        30 TURNER           1500   WARD,TURNER,ALLEN,JAMES,BLAKE,MARTIN
        30 ALLEN            1600   WARD,TURNER,ALLEN,JAMES,BLAKE,MARTIN
        30 JAMES             950   WARD,TURNER,ALLEN,JAMES,BLAKE,MARTIN
        30 BLAKE            2850   WARD,TURNER,ALLEN,JAMES,BLAKE,MARTIN
        30 MARTIN           1250   WARD,TURNER,ALLEN,JAMES,BLAKE,MARTIN
已选择14行。

listagg() 函数

    LISTAGG(列名,’ 分割符号’): oracle 11g 以上的版本才有的一个将指定列名的多行查询结果，用 指定的分割符号 合并成一行显示

普通函数

对工资进行排序，用逗号进行拼接。

select listagg(ename,',')within group(order by sal)name from emp;

NAME
----------------------------------------------------------------------------------------------------
SMITH,JAMES,ADAMS,MARTIN,WARD,MILLER,TURNER,ALLEN,CLARK,BLAKE,JONES,FORD,SCOTT,KING

分组函数

select deptno,listagg(ename,',')within group(order by sal)name from emp group by deptno;

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

分析函数：

select deptno,ename,sal,listagg(ename,',')within group(order by sal)over(partition by deptno)name from emp;

    DEPTNO ENAME             SAL NAME
---------- ---------- ---------- ----------------------------------------
        10 MILLER           1300 MILLER,CLARK,KING
        10 CLARK            2450 MILLER,CLARK,KING
        10 KING             5000 MILLER,CLARK,KING
        20 SMITH             800 SMITH,ADAMS,JONES,SCOTT,FORD
        20 ADAMS            1100 SMITH,ADAMS,JONES,SCOTT,FORD
        20 JONES            2975 SMITH,ADAMS,JONES,SCOTT,FORD
        20 SCOTT            3000 SMITH,ADAMS,JONES,SCOTT,FORD
        20 FORD             3000 SMITH,ADAMS,JONES,SCOTT,FORD
        30 JAMES             950 JAMES,MARTIN,WARD,TURNER,ALLEN,BLAKE
        30 MARTIN           1250 JAMES,MARTIN,WARD,TURNER,ALLEN,BLAKE
        30 WARD             1250 JAMES,MARTIN,WARD,TURNER,ALLEN,BLAKE
        30 TURNER           1500 JAMES,MARTIN,WARD,TURNER,ALLEN,BLAKE
        30 ALLEN            1600 JAMES,MARTIN,WARD,TURNER,ALLEN,BLAKE
        30 BLAKE            2850 JAMES,MARTIN,WARD,TURNER,ALLEN,BLAKE