How to join table in sql without removing data from table1

Question

For every person in column D with number in it.

I need to find person's last name from 2nd table.

select
    a.TIME_STAMP,
    a.RDATE,
    a.TYPE,
    a.PERSON
from table1 a

table2 has person's lastname and field is called last

I tried

select
    a.TIME_STAMP,
    a.RDATE,
    a.TYPE,
    a.PERSON,
    b.last,
from table1 a, table b 
where a.PERSON = b.PERSON 

and it outputs following by removing ABC_CHANGE from the result

How can I fix query so it won't remove ABC_CHANGE.

I am doing this in crystal report just for extra information but it does same in SQLPlus.

Answer 1

If you want all rows in table A, even if there isn't a match in table B, you need to use a LEFT OUTER JOIN:

select
    a.TIME_STAMP,
    a.RDATE,
    a.TYPE,
    a.PERSON,
    b.last,
from table1 a
LEFT OUTER JOIN table b ON a.PERSON = b.PERSON