I have a 3rd party piece of software which records data samples from industrial equipment. This data logging software stores data in sample data tables with approximately one day's worth of samples ...
Assuming that the following query is legitimate and executes successfully, is there any way to speed it up? SELECT foo from T1 --T1 is a huge (>5e6 rows) table with no indexes UNION SELECT bar ...
I want return records from two database tables when a record differs in at least one of the fields. I have written a query for it using the UNION operator. It is working absolutely fine. However, I ...