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Developer-C 11.1
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CREATE TABLE test ( e_id NUMBER(10), col_id NUMBER(10), col_ans VARCHAR2(30), col_pos_id NUMBER(10) );
--reference table CREATE TABLE lookup_table ( col_id NUMBER(10), col_value VARCHAR2(20) );
BEGIN INSERT INTO test VALUES(1,7,null,29); INSERT INTO test VALUES(1,45,'test',30); INSERT INTO test VALUES(1,13,'test1',31); INSERT INTO test VALUES(1,14,'test2',32); INSERT INTO test VALUES(1,15,'test3',33); INSERT INTO lookup_table VALUES(29,'demo'); END; /
1 rows affected
SELECT t.e_id, CASE WHEN t.col_pos_id= 29 -- AND t.col_id = 7 /* will always be true due to the JOIN condition */ THEN rt.col_value || '-' || (SELECT col_ans FROM test x WHERE x.col_id = 45) ELSE rt.col_value END AS output FROM test t INNER JOIN lookup_table rt ON (rt.col_id = t.col_pos_id AND t.col_id = 7 );
E_ID
OUTPUT
1
demo-test
SELECT t.e_id, rt.col_value || x.col_ans AS output FROM test t INNER JOIN lookup_table rt ON (rt.col_id = t.col_pos_id AND t.col_id = 7 ) LEFT OUTER JOIN (SELECT '-' || col_ans AS col_ans FROM test WHERE col_id = 45) x ON (t.col_pos_id= 29);
E_ID
OUTPUT
1
demo-test