mysql - Join Select Statement after on -


is possible join on part of string split up? tried something:

select param.par_name,     parpat.pp_pattern,     kom.kom_name    inv.inv_parpat parpat         inner join inv.inv_param param                 on parpat.pp_par_id = param.par_id         inner join inv.inv_komponente kom                 on kom.kom_id = (select substr(parpat.pp_pattern,                                         instr(parpat.pp_pattern, ':') + 1                                         )                                    inv.inv_parpat)   parpat.pp_pattern '%ata%';

this statement says: single row subquery returns more 1 row

you need join parpat based on substring column. if join subquery,the subquery should return 1 value (like max() or min() function do). else can use in clause subquery. remember, there performance considerations while using in. case, try below query:

select param.par_name,        parpat.pp_pattern,        kom.kom_name   inv.inv_parpat parpat        inner join inv.inv_param param on parpat.pp_par_id = param.par_id        inner join inv.inv_komponente kom on kom.kom_id = (substr(parpat.pp_pattern,instr(parpat.pp_pattern, ':')+1))  parpat.pp_pattern '%ata%';

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