oracle行列轉換

1、多行轉換單列字串

比如:

需要轉換成:

1    b,z,x

2    c,x

寫法1：

select t.rank ,max(substr(sys_connect_by_path(t.name, ','), 2))

from (select rank, name, row_number() over(partition by rank order by rowid ) rn
from temptest2) t
start with rn = 1
connect by rn = prior rn + 1
and rank = prior rank
group by t.rank;

會組織一條路徑

,比如,a,b,c  

通過substr

再擷取會有

aa,b

a,b,c

max即得到結果

寫法2:

select t.rank, wmsys.wm_concat(t.name) time from temptest2 t  group by t.rank;

寫法1：

with t as ( 

select 1 id1,',tt,aa,bb' c1 from dual union
select 2 id1,',abc,xyz' c1 from dual
)select  distinct  id1,regexp_substr(c1,'[^,]+',1,level) from t connect by level < =length(c1)-length(replace(c1,',',''));

with t as ( 

select 1 id1,',tt,aa,bb' c1 from dual union
select 2 id1,',abc,xyz' c1 from dual
)select  distinct  id1,substr(c1||',',instr(c1||',',',',1,level)+1,instr(c1||',',',',1,level+1) - instr(c1||',',',',1,level)- 1 ),
level 
from t  connect by level < =length(c1)-length(replace(c1,',',''));

3、多行轉換成多列

通過max(case when... )或sum(case when...)

4、多列轉換成多行

通過union all

union all

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