您可以使用PL / sql块和Dynamic尝试这样的操作CURSOR。请注意，这里我使用ID = 1和2作为变量，您应该知道该变量并将其从某个地方传递。
DBMS_sql.RETURN_RESULT（12c及更高版本）用于显示动态构造的游标的输出。或者，您可以使用PRINTcommand从中获取并显示o / p REFCURSOR。
SET serveroutput ON
DECLARE
v_ref SYS_REFCURSOR;
id1 X.ID%TYPE := 1;
id2 X.ID%TYPE := 2;
v_col VARCHAR2(32);
v_cols VARCHAR2(1000);
BEGIN
FOR r IN
( SELECT column_name FROM USER_TAB_COLUMNS WHERE table_name = 'X'
)
LOOP
EXECUTE IMMEDIATE '
SELECT
CASE
WHEN a.'||r.column_name|| ' = ' || 'b.'|| r.column_name ||'
THEN a.'||r.column_name || ' END
FROM
X a
CROSS JOIN X b WHERE
a.ID = :Id1 AND b.ID = :Id2' INTO v_col USING id1,id2 ;
v_cols := v_cols ||
CASE
WHEN v_col IS NULL THEN
','||r.column_name
END;
END LOOP;
v_cols := TRIM(BOTH ',' FROM v_cols);
OPEN v_ref FOR 'select ' || v_cols || ' FROM X WHERE ID = '||id1||'
UNION ALL select ' || v_cols || ' FROM X WHERE ID = '||id2 ;
DBMS_sql.RETURN_RESULT(v_ref);
END;
/
ResultSet #1
ID CITY ZIP SEGMENT_ONE
------------------ --------- ------------ -----------
1 14228 X71
2 JamesTown 14845 X72
PL/sql procedure successfully completed.
602392714
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