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Developer-C 11.1
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CREATE TABLE FORM ( ID_FORM INT, ACT_1 VARCHAR2 (10), ACT_2 VARCHAR2 (10), ACT_3 VARCHAR2 (10), ACT_4 VARCHAR2 (10), DESC_1 VARCHAR2 (10), DESC_2 VARCHAR2 (10), DESC_3 VARCHAR2 (10), DESC_4 VARCHAR2 (10), ECH_1 INT, ECH_2 INT, ECH_3 INT, ECH_4 INT );
insert into form select '1','A1','A2','A3',null,'D1','D2','D3',null,'2','12','6',null from dual union select '2','A1','A1','A3',null,'D1','D2','D1',null,'2','2','2',null from dual union select '3','A3','A3','A1',null,'D4','D4','D1',null,'2','2','12',null from dual
3 rows affected
select id_form, count(distinct act || desc_ || ech) as cnt from form unpivot ( (act, desc_, ech) for presta_no in ( (act_1, desc_1, ech_1) as '1', (act_2, desc_2, ech_2) as '2', (act_3, desc_3, ech_3) as '3', (act_4, desc_4, ech_4) as '4' ) ) p group by id_form
ID_FORM
CNT
1
3
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3
2