在SQL中合并所有命令

Question

SELECT  a.VPNID||'|'||a.PUBLICNUMBER||'|'||a.PRIVATENUMBER   from virtualterminal a 
UNION ALL
SELECT  b.VPNID||'|'||b.PUBLICNUMBER||'|'||b.PRIVATENUMBER||'|'||b.PROFILEID from terminal b;

This is the code , but in the first statement as you can see there is no PROFILEID column. I would like to write " null " to that column because we don't know the PROFILEID of them. How can I write "null" to that column ?

Answer 1

Try this Query:

SELECT  a.VPNID||'|'||a.PUBLICNUMBER||'|'||a.PRIVATENUMBER||'|'||'NULL'
from  virtualterminal a 
UNION ALL
SELECT  b.VPNID||'|'||b.PUBLICNUMBER||'|'||b.PRIVATENUMBER||'|'||b.PROFILEID 
from terminal b;