```
where h.er = select ( p.er from tip p where p.os = 'Android' OR 'iOS' ) AND h.ssn = (select h2.ssn  from persons h2 where h2.ssn like '213%');

```

I am performing this function in mysql. IT is not letting me to do it. An error is coming like check the manual the mysql version cooresponds to. I am using 5.1.5.1 MYsql