How fetch & insert NULL values in mysql? -


my query-:

select sfo.`customer_email`,cg. customer_group_code did, cg1. customer_group_code cid, cev. value cv, cev1. value cv1, cev2. value cv2, cev3. value cv3, sfo.`increment_id` `sales_flat_order` sfo, `customer_entity` ce, `customer_entity` ce1, `customer_group`  cg, `customer_group`  cg1, `customer_entity_varchar` cev, `customer_entity_varchar` cev1, `customer_entity_varchar` cev2, `customer_entity_varchar` cev3, order o sfo.dealer_id =  ce.entity_id , ce.group_id = cg.customer_group_id , sfo.customer_id = ce1.entity_id , ce1.group_id = cg1.customer_group_id , sfo.dealer_id = cev.entity_id , cev. attribute_id = 5 , sfo.dealer_id = cev1.entity_id , cev1. attribute_id = 7 , sfo.customer_id = cev2.entity_id , cev2. attribute_id = 5 , sfo.customer_id = cev3.entity_id , cev3. attribute_id = 7 , sfo.`increment_id` = o.`increment_id` , o.order_sts = 0

o/p-:

customer_email     did     cid    cv     cv1     cv2    cv3   increment_id   aa.zz@test.com     100     120    a1     z1      b1      y1      1 bb.uu@fake.com     522     123    p1     l1      k2      j3      2                    null                                          3

so sales_flat_order table stores dealer & customer id...but there may case customer don't have dealer when order takes place, such customers, dealer_id null...in case query can't fetch anythng fails due null... shown above, suppose did=null increment_id =3, not fetch value tables.

so when sfo.customer_id(cid) / sfo.dealer_id(did) null,,i want put such condition can fetch null value & query work fine & insert othr columns?

so how can fetch & insert null values in mysql?

plz guide me...


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