I have two tables: one is Tour and other is ReservedTour. The columns of the tables are:

```
Tour | ReservedTour
===========|=============
id | id
city | Tid
capacity | number
timeout | .
. | .
. | .
. |
========== |======
```

I write an SQL statement such as

```
select *, (select sum(rt.`number`) from ReservedTour as rt where rt.`Tid`=t.id GROUP BY rt.`Tid`) as total
from Tour as t
where City = 'alahom' and '1400-12-13' <= t.`timeout` and 4 < t.`Capacity`- total;
```

but this has an error — the total is not correct.

How can I correct this?

Try this:

```
select t.*, sum(rt.`number`) as total
from Tour as t
join ReservedTour as rt on rt.`Tid`=t.id
where City = 'alahom' and t.`timeout`=> '1400-12-13' and t.`Capacity`-total > 4
GROUP BY t.id
```