sql - How to GROUP BY a new index in a new VIEW -


i have 2 tables (load+road) , want make new view creating new column (flag) indexate count of lines, , group new index. have tried this: (but doesnt work)

sprintf(my_cmd,  "create view myview(id, rlength, llength, flag) " "select road.id, road.length, load.length, count(*) flag  road, load " "where road.id=load.id; " "select id, rlength, llength  myview" "group flag");

error: error executing query: error: column "road.id" must appear in group clause or used in aggregate function

i using sql.

*edit:

i dont want new column (flag) appears in last select, want group it.. dont know if can done. if not, thing wanna reach, use group on "select id, rlength, llength " , lines in 1 group, dont have common parameter between thees lines have trying add "flag"

the full code (sorry long question):

sprintf(my_cmd,  "create view myview3(id, rlength, llength, flag) as" " select road.id, road.length, load.length, count(*) flag  road, load" " road.id=load.id;" " select id, rlength, llength myview3" " group flag" " having count(*) <= %d" " order (cast(llength float) / cast(rlength float)) desc, id desc",k);

and trying do, first k lines after making order without using limit/top (its assigment). have tried using new view indecator use grouping lines 1 group , use having count(flag) <= k.

road:

.--------.----------------.----------------. | id | length | speed | .--------.----------------.----------------.-

| 9 | 55 | 90 |

| 10 | 44 | 80 |

| 11 | 70 | 100 |

load:

.--------.----------------.----------------. | id | length | speed | .--------.----------------.----------------.-

| 9 | 10 | 20 |

| 10 | 15 | 30 |

| 11 | 30 | 60 |

command: loadranking 2 (k=2, want first 2 lines after order, lets not talk order in result)

result:

.--------.----------------.----------------. | id | length | speed | .--------.----------------.----------------.-

| 9 | 10/55 | 20/90 |

| 10 | 15/44 | 30/80 |

your group should contain columns being selected not part of aggregate function. group should this:

group road.id, road.length, load.length

that being said, quite confused why have 2 queries here. suspect query should this:

select road.id, road.length, load.length, count(*) flag  road, load  road.id=load.id group road.id, road.length, load.length having count(*) <= %d  order (cast(load.length float) / cast(road.length float)) desc, road.id desc

the group statement

additional note: try making sure query works before making view.


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