mysql - Replace last string in IP-address accornding to specific condition in PL/SQL -


i've got table fields , values:

 entaddr (varchar2)     entifindex (varchar2) 18.17.16.2                1 18.17.16.53               2 18.17.16.1                3 18.17.16.54               4

i have join 1st , 3rd record knowing 1st entaddr. how can 18.17.16.1 18.17.16.2? (last char -1). have join 2nd , 4th record knowing 2nd entaddr (18.17.16.54 18.17.16.53, i.e last char +1)

so need "select" like:

select
entifindex table1
'some transformation of entaddr (changing last char) '= entaddr

thanks in advice!!

is looking @ 

sql> select concat (substr('18.17.16.2',1,9),substr ('18.17.16.2',-1)-1 ) "concat val" dual;  concat val ---------- 18.17.16.1

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