Row array values to be shown in one column

Question

INTPUT
T[0] = 123
T[1] = 124
T[2] = 125
X[0] = X0
X[1] = X1
X[2] = X2
X[3] = X3
A[0] = A0
A[1] = A1
Y[0] = Y0
Y[1] = Y1
Y[2] = Y2
OUTPUT =
T     X     A     Y
===========================
123     X0     A0     Y0
124     X1     A1     Y1
125     X2     null     Y2
null     X3     null     null

Answer 1

Hi,
782331 wrote:
CREATE TABLE testinput (
T0 varchar2(30) ,
T1 varchar2(30) ,
T2 varchar2(30) ,
X0 varchar2(30) ,
X1 varchar2(30) ,
X2 varchar2(30) ,
X3 varchar2(30) ,
A0 varchar2(30) ,
A1 varchar2(30) ,
Y0 varchar2(30) ,
Y1 varchar2(30) ,
Y2 varchar2(30) )
insert into testinput ( T0 , T1 , T2 , X0 , X1 , X2 , X3 , A0 , A1 , Y0 , Y1 , Y2 )
values ( '123','124','125','X0','X1','X2','X3','A0','A1','Y0','Y1','Y2' );Oh! Your table has 1 row and 12 columns. In your first message, it looked like it had 12 rows and 2 or 3 columns.
(Actually, the number of rows doesn't matter.)
In that case, you want Unpivot rather than pivot.
A better way to do unpivot was also introduced in Oracle 11. Since you I don't know what version you have, I'll show you the less elegant way, which will work in Oracle 9 or higher so the chances that you can use it are higher:
WITH     got_r_num     AS
     SELECT     LEVEL - 1     AS r_num
     FROM     dual
     CONNECT BY     LEVEL <= 4
SELECT       CASE  r.r_num
            WHEN  0  THEN  t.t0
            WHEN  1  THEN  t.t1
            WHEN  2  THEN  t.t2
            WHEN  3  THEN  NULL     -- Default, but it doesn't hurt to say so explicitly
       END          AS t
,       CASE  r.r_num
            WHEN  0  THEN  t.x0
            WHEN  1  THEN  t.x1
            WHEN  2  THEN  t.x2
            WHEN  3  THEN  t.x3
       END          AS x
,       CASE  r.r_num
            WHEN  0  THEN  t.a0
            WHEN  1  THEN  t.a1
                        ELSE  NULL
       END          AS a
,       CASE  r.r_num
            WHEN  0  THEN  t.y0
            WHEN  1  THEN  t.y1
            WHEN  2  THEN  t.y2
            WHEN  3  THEN  NULL
       END          AS x
FROM            testinput  t
CROSS JOIN     got_r_num  r
ORDER BY  r_num
;For every row in your table, we want 4 rows of output. To get that, we can join each row in the table to 4 rows in some other table. (In this example, the other "table" is actually the result set of a sub-query.)
With minor changes, the same approach will work in Oracle 8 and earlier versions, too.