exact fetch returns more than requested number of rows

[Prakash]

-- Example to show error message - "exact fetch returns more than requested number of rows"

Code: [Select]

DECLARE
   x   DUAL.dummy%TYPE;
BEGIN
   SELECT dummy
     INTO x
     FROM DUAL, (SELECT * FROM all_users);
END;
--Solution to correct this is by fetching rows that can be accommodated into the catching variable.

Code: [Select]

DECLARE
   x   DUAL.dummy%TYPE;
BEGIN
   SELECT dummy
     INTO x
     FROM DUAL;
   -- SELECT * FROM all_users; --Can't do this here
END;
-- This error occurs when more number of rows are retrieved and being assigned to a variable
-- that can hold only one single value. You need to retrieve only row(s) that can be held in the
-- catching variable

[Prakash]

In addition to above details to this error/exception:

ORA-01422: exact fetch returns more than requested number of rows

By default, a SELECT INTO statement must return only one row. Otherwise, PL/SQL raises the predefined exception TOO_MANY_ROWS and the values of the variables in the INTO clause are undefined. Make sure your WHERE clause is specific enough to only match one row

If no rows are returned, PL/SQL raises NO_DATA_FOUND. You can guard against this exception by selecting the result of an aggregate function, such as COUNT  or AVG(), where practical. These functions are guaranteed to return a single value, even if no rows match the condition.

[Mike]

Thank you, Prakash!

We've added this information into the error code listing for the ORA-01422 error.