it's my first time here and my first question so sorry if i ask something stupid.
Well my problem is for MySQL. 
Let me explain

I have 4 tables (T1,T2,T3,T4)

T1 (t1\_id,external\_id) here i keep the id's from T2,T3,T4 and then i have
T2 (t2\_id,name,etc...)
T3 (t3\_id,name,etc...)
T4 (t4\_id,name,etc...)

the T1 has already some entries from these tables.
T2,T3,T4 have nothing common beetwen them but T1 has cause it keeps their ID's.

so the query is

```
**SELECT T1.*, T2.*, T3.*, T4.*
FROM T1
INNER JOIN T2 ON T2.t2_id=T1.external_id
INNER JOIN T3 ON T3.t2_id=T1.external_id
INNER JOIN T4 ON T4.t2_id=T1.external_id**

```

and it doesn't show nothing.I tried with LEFT JOIN but nothing.... but if i do this

```
**SELECT T1.*, T2.*
FROM T1
INNER JOIN T2 ON T2.t2_id=T1.external_id**

```

it works and shows data.

I hope you understand my problem.
Thanks!