Can i open more than one Resultset object

hi in my program i have to retrive data from three table and the data from three
table i have to use in another one
i wanna know that can we open more than one ResultSet object within one
try{
}catch{] block ( i means ResultSet rs = st.excuteQuery(query) more than one time for different -different tables)
or there is any other way to do this

You can only have one active result set per statement at a time.
Depending on the driver you are using you might be able to have more than one active statement (and result set) on one connection. Or not.
Try catch has nothing to do with that.
If you are nesting result sets then it is likely you should be using a join (SQL) which would then only require one result set.

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