I have two tables.
orders table and ship table
For orders table,

For ship table,
ordernum        tracking_num
1                           t1    
3                           t3

I want to have the Result looks like
ordernum      tracking_num
-----------      ----------------
1                         t1
3                         t3

if i do like,

select orders(*), ship(*)
from orders, ship
where orders.ordernum = ship.ordernum

it only displays two results.

but i want to display all of ordernum with tracking_num(it's ok even though it is null)

how can i do that??
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You're looking for a LEFT JOIN.  That will include all fields from the LEFT table whether they match the right table or not.

FROM orders LEFT JOIN ship
    ON (orders.order_num = ship.ordernum)

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