Question

I have a simple SQL question, I thought it would be quite straight forward but have got myself in a muddle. Any help would be appreciated

I have table A which contains a last updated
Table A has a one to many with Table B
Table B has a one to many with Table C

I want to show all rows of table C with the last updated time from table A. I have tried some joins but they dont seem to be quite working. Ideally I want somehting like

select a.lastUpdated c.* from TableA a, TableC c where
a.id in (select a_id from TableB where (select b_id from TableC where c_id = select 
id  from TableC where XXXX=YYYY))

so I can pass in an id for table C and then get one row returned with the last updated time present.

XXX=YYY would be my criteria for returning one row of table C.

Any help or pointers appreciated

Thanks

Answer 1

Something like

SELECT c.* 
FROM TableA AS a 
    INNER JOIN TableB AS b 
    ON a.a_id = b.b_id 
        INNER JOIN TableC AS c 
        ON b.b_id = c.c_id 
WHERE a.lastUpdated = c.lastUpdated;

Should work. This is a situation where a striaght INNER JOIN should suffice; unless of course I have missed something.

I hope this helps.