mysql - The left joins making query slow,is there any method to increase the speed of this query -

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select      b.entry_id,     b.assign_id,     a.profile_type,     a.profile_id,     a.profile_name,     a.profile_status,     b.entry_type,     b.assign_id,     c.chapter_name,     d.section_name,     h.group_name,     i.programme_name,     k.subjectprogramme_name,     j.masterprogramme_name,     l.developmentprogramme_name profile_master left join profile_assign b on (a.profile_id = b.profile_id)   left join chapter_master c         on (b.entry_id = c.chapter_id , b.entry_type='chapter')  left join section_master d         on (b.entry_id = d.section_id , b.entry_type='section') left join group_master h         on (b.entry_id = h.group_id , b.entry_type='group'             , h.year_id='".$this->year."') left join programme_master         on (b.entry_id = i.programme_id , b.entry_type='programme'             , i.year_id='".$this->year."') left join subjectprogramme_master k         on (b.entry_id = k.subjectprogramme_id , b.entry_type='subjectprogramme'             , k.year_id='".$this->year."') left join masterprogramme_master j         on (b.entry_id = j.masterprogramme_id , b.entry_type='masterprogramme'             , j.year_id='".$this->year."') left join developmentprogramme_master l         on (b.entry_id = l.developmentprogramme_id             , b.entry_type='developmentprogramme')

1) rid of coditions left join. use clause filtering

2) guess union or 7 queries (by each entity separetely) better in case


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