Android : java.lang.IllegalArgumentException: column '_id' does not exist - 


cursor ck = db.rawquery("select name,title,text,type abstracts_item,abstract_author,authors_abstract abstract_author._id == authors_abstract.abstractauthor_id , abstracts_item._id ==  authors_abstract.abstractsitem_id", null);

i run same query other sqlite tool. works fine. but, when try use cursor. got error 

java.lang.illegalargumentexception: column '_id' not exist

i got many solutions. but, nothing worked me. happy, if guys me solve that.

the sql language not use == rather =.

so s/b:

cursor ck = db.rawquery("select name,title,text,type abstracts_item,abstract_author,authors_abstract abstract_author._id = authors_abstract.abstractauthor_id , abstracts_item._id = authors_abstract.abstractsitem_id", null);

you increase performance using inner joins rather clause:

cursor ck = db.rawquery("select name,title,text,type abstracts_item      inner join abstract_author on abstract_author._id = authors_abstract.abstractauthor_id     inner join authors_abstract on abstracts_item._id = authors_abstract.abstractsitem_id", null);

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