A为ADS中的普通表,a为A的分区列,类型为bigint,b为A中的普通列,类型为bigint请判断以下相关SQL中哪句语法是否误的()
A.select a from a order by a LIMit 100 B.SELECT a+b, count(a) FROM A group by a+b order bY a C.select a,b from a order by a+b limit 100 D.SELECT a, count(a) FROM A group by a ORDER BY a