Question

We have a customer who does {something}, and after that some of our sequences are returning numbers that have already been used. While the long term answer would be for them to stop doing {something}, I need a simple way to check the sequences against the tables they are used in.

I can query user_sequences to get the last_number for each sequence and I can get the max(id_number) for each table. But when I try to do both in the same query I get nulls back.

My broken SQL is:

select max(last_number) , max(id_number) from user_sequences,
squiggly.ACCOUNT_CODE_DEFINITION where sequence_name = 'ACCOUNT_CODE_DEFINITION_SEQ' 
and sequence_owner = 'SQUIGGLY' ;

Answer 1

you can get the MAX from both tables with this query:

SELECT (SELECT last_number
          FROM all_sequences
         WHERE sequence_name = 'ACCOUNT_CODE_DEFINITION_SEQ'
           AND sequence_owner = 'SQUIGGLY') max_sequence,
       (SELECT MAX(id_number) 
          FROM squiggly.ACCOUNT_CODE_DEFINITION) max_id_number
  FROM dual