sqlite3 - column delta values -

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i planning store query data in sqlite3 database.

i have these fields in sqlite3

unix_epoch, cumulative_query_rate 1452128581, 150 1452128582, 190 1452128583, 220 1452128584, 270

i want queries-per-second column below:

qps 0 40 30 50

how do in sqlite3.

you have subtract value of previous second:

select unix_epoch,        (select t1.cumulative_query_rate - t2.cumulative_query_rate         supersecrettablename t2         t1.unix_epoch - 1 = t2.unix_epoch        ) qps supersecrettablename t1;

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