SQL的聚合函数与排序
这次给大家带来SQL的聚合函数与排序,使用SQL聚合函数与排序的注意事项有哪些,下面就是实战案例,一起来看一下。count 函数语法:1Select count(*)|count(列名) from table_name [where where_defination];Select count(id) from stu;Select count(name) from stu where math
这次给大家带来SQL的聚合函数与排序,使用SQL聚合函数与排序的注意事项有哪些,下面就是实战案例,一起来看一下。count 函数语法:1Select count(*)|count(列名) from table_name [where where_defination];Select count(id) from stu;Select count(name) from stu where math