mysql - sqlite query to get 1 table row but grouping based on other table -

-


mysql - sqlite query to get 1 table row but grouping based on other table -

i developing application need query sqlite database.

"team" table

teamid, teamname 1, eagle 2, tiger 3, snake 4, lion

"member" table

memberid, teamid, membername, membergender 1, 1, yuli, f 2, 2, george, m 3, 3, rudy, f 4, 4, mike, m 5, 1, susi, f 6, 2, michael, m 7, 1, lisa, f 8, 3, john, m 9, 4, linda, f 10, 4, torry, m 11, 2, jessica, f 12, 2, abba, f

requirement : 1. show "member" table 2. list need grouped teamid 3. if in team there "male" set team on top (first) * team not have "male" set on bottom (last) 4. grouping sorted teamid * fellow member of same teamid must listed in sequence ordered

the expected homecoming list should be:

memberid, teamid, membername, membergender 2, 2, george, m 6, 2, michael, m 11, 2, jessica, f 12, 2, abba, f 8, 3, john, m 3, 3, rudy, f 4, 4, mike, m 10, 4, torry, m 9, 4, linda, f 1, 1, yuli, f 5, 1, susi, f 7, 1, lisa, f

** note: grouping teamid

currently can sort "member" table membergender can not create them in grouping @ same time.

please help me create sqlite query (or in mysql if sqlite not possible)

note -- in mysql. might work in sqlite has group_concat, , may need alter left join left outer join i'm not sure (i utilize mysql not sqlite) -- give go.

select member.*, hasmale fellow member left bring together (select teamid, group_concat(membergender) '%m%' hasmale fellow member grouping teamid) t2 on t2.teamid=member.teamid order hasmale desc,teamid,memberid; explanation

first see whether team has male:

select group_concat(membergender) '%m%' hasmale fellow member grouping teamid;

the group_concat(membergender)..group teamid converts genders each team f,m,f,f, etc. like '%m% tests whether there m in gender string, returns 1 if team has male , 0 otherewise.

secondly, bring together member table hasmale table, , order first whether team has male, (within that) team, , (within that) fellow member id. since did left join, hasmale value repeated each fellow member in each team.

mysql sqlite group-by sql-order-by priority

Comments

Post a Comment

Popular posts from this blog

How do I check if an insert was successful with MySQLdb in Python? -

-
How do I check if an insert was successful with MySQLdb in Python? - i have code: cursor = conn.cursor() cursor.execute(("insert new_files (videos_id, filename, " "is_processing) values (%s,%s,1)"), (id, filename)) logging.warn("%d", cursor.rowcount) if (cursor.rowcount == 1): logging.info("inserted values %d, %s", id, filename) else: logging.warn("failed insert values %d, %s", id, filename) cursor.close() fun is, cursor.rowcount always one, though updated database create videos_id unique key. is, insert fails because in tests same videos_id going appear (and when check database, nil inserted). whatever reason, rowcount 1 - logging.warn have spits out rowcount of 1. so, question: can utilize rowcount work out if insert went fine? if so, (presumably) doing wrong? otherwise, how check if insert went fine? your code not commit after modifications (your modifications rolled back). should...
Read more

delphi - blogger via idHTTP : error 400 bad request -

-
delphi - blogger via idHTTP : error 400 bad request - i'm trying post blogger using idhttp component, however, i'm getting "http/1.0 400 bad request" error. procedure tform1.button1click(sender: tobject); var request,response,req : tstringlist; auth,blogid : string; begin blogid := '00000000000000000000000'; request := tstringlist.create; response := tstringlist.create; req := tstringlist.create; idhttp1.request.connection := 'keep-alive'; idhttp1.request.contenttype := 'application/x-www-form-urlencoded'; idssliohandlersocket1.ssloptions.method := sslvsslv23; request.clear(); request.values['accounttype'] := 'google'; request.values['email'] := 'xxx@gmail.com'; request.values['passwd'] := 'yyy'; request.values['service'] := 'blogger'; response.text :=idhttp1.post('https://www.google.com/accounts/clientlogin',request); auth := resp...
Read more

postgresql - ERROR: operator is not unique: unknown + unknown -

-
postgresql - ERROR: operator is not unique: unknown + unknown - i have postgis database , have compute new values rows in new column. these values should average of values of several columns. query: insert bdps (da_m) values (avg('da_1'+'da_2'+'da_3'+'da_4'+'da_5'+'da_6'+'da_7')); in query bdps database, da_m new column , da_1 da_7 existing columns have double precision type. da_m created using alter table bdps add together column da_m double precision; i next error: error: operator not unique: unknown + unknown line 2: values (avg('da_1'+'da_2'+'da_3'+'da_4'+'da_5'+'da_6'+'da_7... ^ hint: not take best candidate operator. might need add together explicit type casts. ********** error ********** error: operator not unique: unknown + unknown sql state: 42725 hint: not take best candidate operator. might need add togethe...
Read more