sql - How to select certain numbers of groups in MySQL? -

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i have table data: id| , table need create pegination productid column. know limit n,m, works rows , not groups. examle table pegination = 2 expect retrieve 9 records productid = 1 , 2 (the number of groups 2).

so how create pegination numbers of groups ?

i thankfull answers example.

one way pagination groups assign product sequence query. using variables, requires subquery:

select t.* (select t.*,              (@rn := if(@p = productid, @rn + 1,                         if(@rn := productid, 1, 1)                        )              ) rn       table t cross join            (select @rn := 0, @p := -1) vars       order t.productid      ) t rn between x , y;

with index on t(productid), can subquery. condition can go in having clause:

select t.*,        (select count(distinct productid)         t t2         t2.productid <= t.productid)        ) pno t having pno between x , y;

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