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SQL code:
create or replace function fun(s in varchar2,s1 in varchar2)
return number
is
i number := 1;
begin
while instr(s,s1,1,i) > 0 loop
i := i + 1;
end loop;
return i;
end fun;
/


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SQL codecreateorreplacefunction fun(sinvarchar2,s1invarchar2)returnnumberis
  inumber :=1;beginwhile instr(s,s1,1,i)>0 loop
      i := i+1;end loop;return i;end fun;/


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SQL code:
create or replace function fun(s in varchar2,s1 in varchar2)
return number
is
i number := 0;
begin
while instr(s,s1,1,i+1) > 0 loop
i := i + 1;
end loop;
return i;
end fun;
/

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