UPDATE ACT_BlockNum SET CreateTime = DATE_ADD(CreateTime, INTERVAL 1 DAY);
UPDATE ACT_BlockNum SET CreateTime = DATE_ADD(CreateTime, INTERVAL -1 DAY);
SELECT IFNULL(SUM(Num),0) from DPEvent.ACT_BlockNum where CreateTime BETWEEN #startTime# AND #endTime#; MYSQL IFNULL(expr1,expr2)
update @A set c1=b.c1 ,c2=b.c2,c3=b.c3 from @A a,@B b where a.id=2 and b.id=6 update A set (A.a2,A.a3) =(select B.b2,b.b3 from B where B.b1= A.a1 and A.a3=100 )
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