MYSQL Diff From MAX -

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i'm trying query motogp result here's sqlfiddle

i want add 2 more columns

  1. pos (1, 2, 3, 4, ...)
  2. gap (rider laptime - 1st pos laptime)

desired result:

  • 1 | marquez | 2799.627 | 2799.627
  • 2 | rossi |2803.143 | 3.516

enter image description here

my current query:

select `rider`, sum(laptime), count(`lapno`), max(`topspeed`) ts     (select      `lapno`,`rider`, (t1+t2+t3+t4) laptime , `topspeed`      `a_lap_time`  t_laptime)  group a.rider order count(`lapno`) desc, sum(laptime) asc

please advise, thank you

this result

|           rider |  laptime |    gap | lapno |    ts | |-----------------|----------|--------|-------|-------| |    marc marquez | 2799.627 |      0 |    30 | 329.3 | | valentino rossi | 2803.143 |  3.516 |    30 | 319.7 |

produced by:

select     `rider`, laptime, laptime - minlaptime gap, lapno, ts (       select            `rider`, laptime, lapno, ts, @lap := if(@lap = 0.0, laptime, @lap) minlaptime       (             select `rider`, sum(laptime) laptime , count(`lapno`) lapno                  , max(`topspeed`) ts                             (select                  `lapno`,`rider`, (t1+t2+t3+t4) laptime , `topspeed`                 `a_lap_time`  t_laptime                  )              group a.rider             ) b       cross join (select @lap :=0) var       order `lapno` desc, laptime asc       ) c

a variable: @lap "attached" each row using cross join, using order minimum overall laptime pass value @lap. once done have 2799.627 value on each row , can calculate gap.

see sqlfiddle: http://sqlfiddle.com/#!9/bd71f/6

for pos well:

select     `rider`, laptime, laptime - minlaptime gap, lapno, ts, pos (       select              `rider`, laptime, lapno, ts            , @lap := if(@lap = 0.0, laptime, @lap) minlaptime            , @pos := @pos + 1 pos       (             select `rider`, sum(laptime) laptime , count(`lapno`) lapno                  , max(`topspeed`) ts                             (select                  `lapno`,`rider`, (t1+t2+t3+t4) laptime , `topspeed`                 `a_lap_time`  t_laptime                  )              group a.rider             ) b       cross join (select @lap :=0, @pos := 0) var       order `lapno` desc, laptime asc       ) c

result:

|           rider |  laptime |   gap | lapno |    ts | pos | |-----------------|----------|-------|-------|-------|-----| |    marc marquez | 2799.627 |     0 |    30 | 329.3 |   1 | | valentino rossi | 2803.143 | 3.516 |    30 | 319.7 |   2 |

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