1. 列轉行
create table t_col_row(
id int,
c1 varchar2(10),
c2 varchar2(10),
c3 varchar2(10));
insert into t_col_row values (1, 'v11', 'v21', 'v31');
insert into t_col_row values (2, 'v12', 'v22', null);
insert into t_col_row values (3, 'v13', null, 'v33');
insert into t_col_row values (4, null, 'v24', 'v34');
insert into t_col_row values (5, 'v15', null, null);
insert into t_col_row values (6, null, null, 'v35');
insert into t_col_row values (7, null, null, null);
commit;
select * from t_col_row;
1)union
適用範圍：8i,9i,10g及以後版本
select id, 'c1' cn, c1 cv
from t_col_row
union
select id, 'c2' cn, c2 cv
from t_col_row
union
select id, 'c3' cn, c3 cv from t_col_row;
若空行不需要轉換，只需加乙個where條件，
where column is not null 即可。
2)model
適用範圍：10g及以後
select id, cn, cv from t_col_row
model
return updated rows
partition by (id)
dimension by (0 as n)
measures ('xx' as cn,'yyy' as cv,c1,c2,c3)
rules upsert all
(cn[1] = 'c1',
cn[2] = 'c2',
cn[3] = 'c3',
cv[1] = c1[0],
cv[2] = c2[0],
cv[3] = c3[0]
)order by id,cn;
3)collection
適用範圍：8i,9i,10g及以後版本
要建立乙個物件和乙個集合：
create type cv_pair as object(cn varchar2(10),cv varchar2(10));
create type cv_varr as varray(8) of cv_pair;
select id, t.cn as cn, t.cv as cv
from t_col_row,
table(cv_varr(cv_pair('c1', t_col_row.c1),
cv_pair('c2', t_col_row.c2),
cv_pair('c3', t_col_row.c3))) t
order by 1, 2;
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