单项选择题
A.SELECT *FROM table WHERE column =value HAVING conditionB.SELECT *FROM table HAVING column =value GROUP BY conditionC.SELECT *FROM table GROUP BY column HAVING conditionD.SELECT *FROM table GROUP BY column WHERE condition HAVING value
A.ORDER BY column1DESCB.ORDER BY column1ASCC.ORDER column1D.SORT column1ASC
A.用来定义表的分区键B.用来在分区表中对数据分区C.用来创建索引以提高查询性能D.用来按指定的列排序数据并将数据分组