oracle - SQL joins using (+) operator in where clause -

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i trying rewrite oracle sql query uses operators in clause join in clause instead. understand how tell if left or right join, don't know make of this... referencing column number???

 alias.column(+) = 1

what trying tell me? i'm rewrite like: 

 left join table  on alias.column = 1

is 1 actual value? if why use (+)? i'm not familiar sql sorry if basic question. it's not easy thing google either... i've tried last hour , cannot find explain join...

take @ this: " (+) = " operator in oracle sql in clause (+) old oracle syntax used joins, it's deprecated. , yes, can (and should) rewrite this.


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