1、标准查询
select [all | distinct ] select_list 对结果集相同行的处理
from table_name
[ where <search_condition> ]
[ group by <group_by_condition> ]
[ having <search_condition> ]
[order by <order_expression> [ ASC | DESC ] ]
2、
1、标准查询
select [all | distinct ] select_list 对结果集相同行的处理
from table_name
[ where <search_condition> ]
[ group by <group_by_condition> ]
[ having <search_condition> ]
[order by <order_expression> [ ASC | DESC ] ]
2、