sql - View already being created in Database now recompiling gives error ORA-00998: must name this expression with a column alias -


my view in database column alias not mentioned after expression in select query:

select a.column1, a.column2, decode (a.column3,'hahaha', b.column21 || ' : ' || a.column4 || ' bye : ' || d.column31,   b.column22) ,  a.column5  , b ,d a.column1 = b.column21  , a.column2= d.column31 (+);

what unable understand if need recompile same view gives error ora-00998: must name expression column alias. understand decode expression missing alias name .

but surprises me how got database.

am unable understand . plz let me know how might have got db.


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