Previous Record
I need to get a previous record from database - i need to retrieve records which differs from the previous one about 5s example:
select eventDate,previousEventDate,eventDate-previousEventDate as delta from events having delta<5 order by eventDate;
eventDate is normal column from table
previousEventDate is an "alias" for the previous date ... how can I write it in SQL?
Please help. I can use SELECT as subquery, but it would be probably really slow, the table will have 100000s maybe milions of records soon.
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