teradata - SQL-- calculated columns using previous row -

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i trying write sql create following table:

_row   id   cola               colb              colc    mov_sum         mult1 mult2   1     x   100                  2                .05     102.5             null  null  2     x   101                  3                .1      206.6             null  null  3     y   a*206.6             b*206.6           .2      206.6*(a+b)+.2           b  4     y   a*(206.6(a+b)+.2)   b*(206.6(a+b)+.2) .4      (etc...)                 b

when id = 'x', cola, colb, , colc known , selected existing table. mov_sum calculated using previous row's mov_sum + cola + col b + colc.

when id = 'y', cola, colb , colc must calculated using previous row's sum_abc. multipliers "a" , "b" constant when id = 'y'.

i'm using teradata sql , cannot incorporate lag/lead syntax. have succeeded in calculating mov_sum (where id=x) creating intermediary table left join table on (where a._row >= b._row), sum(mov_sum) grouping _row.

i cannot figure out how incorporate when id= y, because cola &colb product of previous mov_sum, , not known values.

i thinking may require recursive query. suggestions?


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