select - MYSQL - returning complete set of tags aftering filtering on specific tags -


i have normalised quotations table , have 4 separate tables pertaining quotes, authors, quotetags (tags classify quotations) , quotestotags (a quotation can have multiple tags e.g. love, happiness, death, etc) 70,000 quotations.

the quotes table consists of fields id, quotation , authorid author table consists of fields id , author (name of author) quotetags consists of fields id , description (e.g. 1 -> happiness, 2 -> admiration) quotestotags consists of id, quoteid, tagid foreign keys quotes table , quotetags table eg (1,1,3 ... 2,1,6....3,2,17..etc)

i want filter quotations series of tags..so if select happiness, love, relationships want select quotations have @ least 1 of these tags associated (alongside id, quotation , author).

now, when filter tags, want return group_concat() of tags each of selected quotations not ones user wants filter by...so if 1 quotation contains 5 tags , 1 of them happiness, want group_concat() contain 5 tags associated it, not ones s/he filtered by.

this problem.i have got work seems return appropriate quotations cant list associated tags. @ moment lists tags filtered :( presume somewhere need exists clause.

so far have this.

 select q.*, (select author authors authors.id = q.authorid)   authorid, group_concat(qt.description ) tags     quotes q    left join quotestotags qtt on q.id = qtt.quoteid    left join quotetags qt on qtt.tagid = qt.id qt.id in (40,45,70) // arbitrary list of tagids group q.id order q.id asc limit 60, 20

i not know how list tags :(

can please me , point me in right direction? in advance.

also appreciate if show me how filter out quotations contained tags passed filter (the idea being return associated tags each quotation). if happiness , love chosen quotations tagged both happinesss , love selected.

leaving out author id (which doesn't seem important question):

select q.*, group_concat(qt.description ) tags quotes q left join      quotestotags qtt      on q.id = qtt.quoteid left join      quotetags qt       on qtt.tagid = qt.id group q.id having sum(qt.id in (40, 45, 70)) > 0 order q.id asc limit 60, 20

the idea use having clause instead of where clause filter tags.


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