sql server 2008 - Delete all records from a table except latest N months records (sorted by id) -

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can please me in solving this. need keep latest 3 months records in table.

table structure:

enter image description here

after purge table should

enter image description here

try this:

delete     tablex      inner join (select max(insertdt ) lastdate, id tablex  group id) lastdates on lastdates.id = tablex.id     insertdt < dateadd(m,-3,lastdates.lastdate)

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