解码 - 删除NULL

Question

请帮我从两列中删除空值

SELECT Decode(pk.property_name, 'msisdn', pv.text_value) MSISDN,
Decode(pk.property_name, 'BAN', pv.text_value) BAN
FROM PROPERTY_VALUE pv, PROPERTY_KEY pk 
WHERE pv.entity_id IN 
(select entity_id from property_value pv where pv.text_value in('ConsumerUnauthenticated')) 
and pv.property_key_id = pk.property_key_id 

这导致表MSISDN和BAN。这两列都包含NULL和NOT NULL值。我想从结果表中消除NULL。请帮忙。

BAD - 

MSISDN    BAN
null      xyz
null      abc
1213      null
null      def
1211      null

我希望我的结果是

MSISDN    BAN
1213      xyz
1211      abc
          def

Answer 1

你真的不应该这样做。检查您问题的评论。但这是查询：

SELECT MSISDN, BAN
FROM (
    SELECT pv.text_value MSISDN, rownum rn
    FROM PROPERTY_VALUE pv, PROPERTY_KEY pk 
    WHERE pv.entity_id IN (select entity_id from property_value pv where pv.text_value in('ConsumerUnauthenticated')) 
    AND pv.property_key_id = pk.property_key_id
    AND pk.property_name = 'msisdn'
    AND pv.text_value IS NOT NULL
) FULL OUTER JOIN (    
    SELECT pv.text_value BAN, rownum rn
    FROM PROPERTY_VALUE pv, PROPERTY_KEY pk 
    WHERE pv.entity_id IN (select entity_id from property_value pv where pv.text_value in('ConsumerUnauthenticated')) 
    AND pv.property_key_id = pk.property_key_id
    AND pk.property_name = 'ban'
    AND pv.text_value IS NOT NULL
) USING (rn)
ORDER BY rn;