Re: SQL query problem (many table in FROM statement and many LEFT JOIN's)
От | Marek Lewczuk |
---|---|
Тема | Re: SQL query problem (many table in FROM statement and many LEFT JOIN's) |
Дата | |
Msg-id | 004001c38f03$8d8b8230$4701a8c0@marek обсуждение исходный текст |
Ответ на | Re: SQL query problem (Karsten Hilbert <Karsten.Hilbert@gmx.net>) |
Ответы |
Re: [SQL] SQL query problem (many table in FROM statement and many LEFT JOIN's)
Re: [SQL] SQL query problem (many table in FROM statement and many LEFT JOIN's) |
Список | pgsql-general |
> > SELECT > > _CON.con_id, > Please make sure you get the quoting right regarding table > names. PostgreSQL will fold _CON into _con unless quoted > "_CON". So, it may be that you created the table with quotes > ("_CON"). Now, in your query you don't use quotes and thusly > it is looking for a _con table. The simple rule of thumb is > to either always or never use quotes. I don't think that this is the solution, becouse the query: SELECT _CON.con_id, _MOD.mod_ty, _CON.dri_id, _CON.man_cod, _ENG.eng_pow FROM db_data.mda_mod _MOD, db_data.mda_mod_con _CON, db_data.mda_mak_eng _ENG, db_data.set_mda_fue _FUE WHERE _MOD.mod_id = '283' AND _CON.mod_id = _MOD.mod_id AND _CON.psd <= NOW() AND _CON.ped > NOW() AND _ENG.eng_id = _CON.eng_id AND _ENG.eng_fue = _FUE.fue_id ...is working fine. I belive that this some problem with LEFT JOIN and FROM statement. If I will rewrite this query: SELECT _CON.con_id, _MOD.mod_ty, _VER.version, _YEA.year, _CON.dri_id, _CON.man_cod, _ENG.eng_pow FROM db_data.mda_mod _MOD JOIN db_data.mda_mod_con _CON ON _CON.mod_id = _MOD.mod_id AND _CON.psd <= NOW() AND _CON.ped > NOW() JOIN db_data.mda_mak_eng _ENG ON _ENG.eng_id = _CON.eng_id JOIN db_data.set_mda_fue _FUE ON _ENG.eng_fue = _FUE.fue_id LEFT JOIN db_data.mda_mod_ver _VER ON _VER.ver_id = _CON.ver_id LEFT JOIN db_data.mda_mod_yea _YEA ON _YEA.yea_id = _CON.yea_id WHERE _MOD.mod_id = '283' ... It also working fine. !!!! The question is, why my first query isn't working: SELECT _CON.con_id, _MOD.mod_ty, _VER.version, _YEA.year, _CON.dri_id, _CON.man_cod, _ENG.eng_pow FROM db_data.mda_mod _MOD, db_data.mda_mod_con _CON, db_data.mda_mak_eng _ENG, db_data.set_mda_fue _FUE LEFT JOIN db_data.mda_mod_ver _VER ON _VER.ver_id = _CON.ver_id LEFT JOIN db_data.mda_mod_yea _YEA ON _YEA.yea_id = _CON.yea_id WHERE _MOD.mod_id = '283' AND _CON.mod_id = _MOD.mod_id AND _CON.psd <= NOW() AND _CON.ped > NOW() AND _ENG.eng_id = _CON.eng_id AND _ENG.eng_fue = _FUE.fue_id
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