wm_concat函式

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首先讓我們來看看這個神奇的函式wm_concat(列名),該函式可以把列值以","號分隔起來,並顯示成一行,接下來上例子,看看這個神奇的函式如何應用

準備測試資料

SQL> create table test(id number,name varchar2(20));

SQL> insert into test values(1,'a');

SQL> insert into test values(1,'b');

SQL> insert into test values(1,'c');

SQL> insert into test values(2,'d');

SQL> insert into test values(2,'e');

SQL> commit;

效果1 : 行轉列

SQL> select wm_concat(name) from test;

WM_CONCAT(NAME)

-------------------------------------------------------------------------

a,b,c,d,e

效果2: 把結果裡的逗號替換成"|"

SQL> select replace(wm_concat(name),',','|') from test;

REPLACE(WM_CONCAT(NAME),',','|')

-----------------------------------------------------------------------

a|b|c|d|e

效果3:按ID分組合並name

SQL> select id,wm_concat(name) name from test group by id;

ID NAME

---------- ------------------------------

1 a,b,c

2 d,e

懶人擴充套件用法:

案例:我要寫一個檢視,類似"create or replace view as select 欄位1,...欄位50 from tablename" ,基表有50多個欄位,要是靠手工寫太麻煩了,有沒有什麼簡便的方法? 當然有了,看我如果應用wm_concat來讓這個需求變簡單

SQL> select 'create or replace view as select '|| wm_concat(column_name) || ' from dept'from user_tab_columns where table_name='DEPT';

'CREATEORREPLACEVIEWASSELECT'||WM_CONCAT(COLUMN_NAME)||'FROMDEPT'

--------------------------------------------------------------------------------

create or replace view as select DEPTNO,DNAME,LOC from dept

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/642366/viewspace-1054285/，如需轉載，請註明出處，否則將追究法律責任。