Перебирать курсор

Question

Я хотел бы создать курсор или таблицу из оператора select, используя в качестве параметра строки другого курсора. В моем примере я получил временную таблицу с одним столбцом и множеством строк. Эти строки должны быть записью следующего выбора и показывать (или сохранять) результаты.

REPLACE PROCEDURE test (IN name_db VARCHAR(25), IN name_table VARCHAR(25), IN n INT)
DYNAMIC RESULT SETS 1
BEGIN
DECLARE a VARCHAR(32000);
DECLARE b VARCHAR(32000);
DECLARE qry VARCHAR(32000);
DECLARE prindx VARCHAR(32000);
DECLARE i INT;
DECLARE p VARCHAR(32000);
DECLARE idx VARCHAR(32000);
DECLARE diff VARCHAR(32000);
DECLARE csr1 CURSOR WITH RETURN FOR stmt1;

SET a = 'SELECT * FROM (SELECT ColumnName AS col1 FROM DBC.Columns WHERE DatabaseName=''' ||name_db || ''' AND TableName=''' || name_table || ''') A1 ';
SET b = 'WHERE ';

SET i=1;
WHILE i <=N DO
   BEGIN
      CASE i
      WHEN 1 THEN
         SET qry = a;
         SET prindx = 'SELECT (col1';
      WHEN 2 THEN
         SET a = a || 'CROSS JOIN (SELECT ColumnName AS col' || CAST(i AS VARCHAR(2)) || ' FROM DBC.Columns WHERE DatabaseName='''||name_db || ''' AND TableName=''' || name_table || ''') A' || CAST(i AS VARCHAR(2)) || ' ';
         SET b = b || 'A' || CAST((i-1) AS VARCHAR(2)) || '.col' || CAST((i-1) AS VARCHAR(2)) || ' < A'  || CAST(i AS VARCHAR(2)) || '.col' || CAST(i AS VARCHAR(2));
         SET qry a || b;
         SET prindx = prindx || ' || '','' || col' || CAST(i AS VARCHAR(2));
      ELSE
         SET a = a || 'CROSS JOIN (SELECT ColumnName AS col' || CAST(i AS VARCHAR(2)) || ' FROM DBC.Columns WHERE DatabaseName='''||name_db || ''' AND TableName=''' || name_table || ''') A' || CAST(i AS VARCHAR(2)) || ' ';
         SET b = b || ' AND A' || CAST((i-1) AS VARCHAR(2)) || '.col' || CAST((i-1) AS VARCHAR(2)) || ' < A'  || CAST(i AS VARCHAR(2)) || '.col' || CAST(i AS VARCHAR(2));
         SET qry a || b;
         SET prindx = prindx || ' || '','' || col' || CAST(i AS VARCHAR(2));
      END CASE;
      SET i = i + 1;
   END;
END WHILE;

   BEGIN
      DECLARE exit HANDLER FOR SQLEXCEPTION
      BEGIN
         IF SQLCODE <> 3807 THEN RESIGNAL; END IF;
      END;
      SET p = name_db || '.tbl1 ';
      DROP TABLE p;
   END;

SET p = 'CREATE TABLE ' || name_db || '.tbl1 AS (' || qry || ') WITH DATA';
EXECUTE IMMEDIATE p;

SET prindx = prindx || ') AS PRYINDX FROM ' || name_db || '.tbl1 ';

PREPARE stmt1 FROM prindx;
OPEN csr1;

--------------------------------------------------------------------------------
FETCH csr1 INTO idx;

SET diff = 'SELECT (MAX(A.TOTAL) - MIN(A.TOTAL)) AS DIFF 
FROM (SELECT HASHAMP(HASHBUCKET(HASHROW(' || idx || '))) CODHASH, CAST(COUNT(*) AS DECIMAL(18,0) TOTAL 
FROM ' || name_db || '.' || name_table || ' GROUP BY 1) A';

Я хотел бы использовать значения "csr1" внутри оператора Select выше и принять все возможные результаты,Сейчас я могу взять последний.