数据库转化null值

mysql数据库:


        SELECT
IF(AVG(cai.conversionsRate) IS NULL,0,AVG(cai.conversionsRate))
AS conversionsRate
FROM campaign_info cai
WHERE insertTime BETWEEN '2011-02-01' AND '2011-02-04' AND googleCampaignId=23331401

Ms-SqlServer数据库


        /*MS-SqlServer去除NULL值*/
select ISNULL(avg(cai.conversionsRate),0)
AS conversionsRate
FROM campaign_info cai
WHERE insertTime BETWEEN '2010-02-11' AND '2011-01-23' AND googleCampaignId=42722951

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