How to frame a SQL for the below Query

Question

i have a SQL query
select x,y from table1 where x=1
output
x y
1 a
1 b
where a means alpha and b means beta
select x,z from table2 where x=1
Output
x z
1 B
How do i build a query to achieve a following output
x z y1 y2
1 b alpha beta
Please noete : Instead of 'a' and 'b' i want it to be replaced by words and
i want two rows value to appear in one column together....

Answer 1

Maybe this is what you want ... I'm under the impression of trying to catch a moving target here.
WITH tb_clr_doc_version_defs AS (SELECT 'A' datatype_cd,
                                        13  doctype_id
                                   FROM dual
                                  UNION
                                 SELECT 'A' datatype_cd,
                                        14  doctype_id
                                   FROM dual
     tb_clr_doc_field_defs AS (SELECT 'AccountNb_ID' fieldname_nm,
                                      13             doctype_id
                                   FROM dual
                                UNION
                               SELECT 'TaxIDNb_NO' fieldname_nm,
                                      13           doctype_id
                                   FROM dual
SELECT datatype,
       MAX(DECODE(fieldname_nm, 'AccountNb_ID', fieldname_nm, NULL)) fieldname_nm1,
       MAX(DECODE(fieldname_nm, 'TaxIDNb_NO'  , fieldname_nm, NULL)) fieldname_nm2
  FROM (SELECT t1.doctype_id,
               DECODE(t1.datatype_cd, 'A', 'afp', 'L', 'line', 'M', 'mixed', t1.datatype_cd) datatype,
               t2.fieldname_nm
          FROM tb_clr_doc_version_defs t1,
               tb_clr_doc_field_defs   t2
         WHERE t1.doctype_id = t2.doctype_id(+)
GROUP BY doctype_id, datatype
  ;