Question

I have 4 tables, Table a, Table b and Table c have same field names but Table d is having different field names, but I need to join the queries and have to be exported as a CSV file.

       select a.name,a.age,b.addr from a,b where a.rid=b.tid UNION select 
       a.name,a.age,c.addr from a,c where a.uiroll=c.piroll

I need to join table d also , but it has some fields and what I require are d.group and d.project and they are related to table a as d.uon=a.von

The result in cvs file should be as

     name     age     addr    group    project

and also the values.

Answer 1

Did you try something like :

SELECT a.name, a.age, b.addr, d.group, d.project 
FROM a, b, d 
WHERE a.rid=b.tib 
AND d.uon=a.von 
UNION 
SELECT a.name, a.age, c.addr, d.group, d.project 
FROM a, c, d 
WHERE a.uiroll=c.piroll 
AND d.uon=a.von