oracl 和db2 常用语法比较: 1、取前N条记录 Oracle:Select * from TableName where rownum <= N; DB2:Select * from TableName fetch first N rows only; 2、取得系统日期 Oracle:Select sysdate from dual; DB2:Select current timestamp from sysibm.sysdummy1; 3、空值转换 Oracle:Select
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
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