Custom Graphs using Analysis Raw Data

I am working on an automation tool that is required to build custom graphs using the data from LoadRunner Analysis file, more precisely the *.mdb file that's supposed to contain all the data, if I am not wrong. However when I try to query the database file the number I am getting seem to be incomplete. For example, the table TransResponseTime doesn't have any data. If I run a query trying to fetch the 90th percentile, i.e. SELECT * FROM `BasicTransactionPercentile` WHERE `Event Name` LIKE '%Login%' AND `Percent` = 90, the number returned by the query and the number displayed in Analysis tool itself are different. Same goes for tables like Event_meter/Event_map. Is there something I am missing? Could anyone help me with the correct tables I should be looking at? Primarily for response times data.

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