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mysql中将null值转换为0的语句

　　本文标签：null

复制代码 代码如下:

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