Question

I have a table which logs record counts of all tables in a schema every 28 days. The table has the following columns:
“TABLE_NAME” VARCHAR2(100 BYTE),
“RECORD_COUNT” NUMBER,
“CREATED” DATE

I would like to spool out a log file which has the following data:

1. Table Name
2. Current Record Count
3. Record Count 28days ago
4. Difference between2 and 3

Thanks for your help.

Answer 1

Something like this should do it

SELECT table_name,
       record_count,
       prior_record_count,
       record_count - prior_record_count diff
  FROM (SELECT table_name,
               record_count,
               lag(record_count) 
                  over (partition by table_name
                            order by created) prior_record_count,
               rank() 
                 over (partition by table_name
                           order by created) rnk
           FROM <<name of table>>)
 WHERE rnk = 1