sql - How to update based on previous record -

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i have have data below:

coursekey  userkey  userspk1  msgmain date   cummcount recent count 32332      33       33        2016-08-22     2         0 32332      33       33        2016-08-24     6         0

i wanting say:

update table set recent count = (cummcount latest date - cummcount previous date);

in case 4.

i confused on how capture previous row using date in case

use lag:

with cte (     select [msgmain date],            cummcount - lag(cummcount, 1, 0) on (order [msgmain date]) newcount     ff )  update ff set [recent count] = cte.newcount ff inner join cte     on ff.[msgmain date] = cte.[msgmain date]

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