Issue with the Full Outer join

Hello Gurus,

This morning one of my colleagues came up to me with a strange issue on full outer join, which is something like this

Table1(T1): CUSTOMER

Table2(T2): SALES_ORDER

FULL OUTER JOIN QUERY:

in the above result set we are missing a value of the "CustomerID" column in the 6th tuple from the SALES_ORDER table which is 'C5'.

Can someone please let me know why this is happening?

Thanks in advance

Regards,

Krishna