发布网友 发布时间:2022-04-25 05:41
共3个回答
热心网友 时间:2023-10-30 23:26
select 学生.学号 as 姓名, sum(成绩.分数) as 总分
from 学生
left join 成绩 on 成绩.学号=学生.学号
group by 学生.学号
sql语句
更新:update table1 set field1=value1 where 范围
查找:select * from table1 where field1 like '%value1%' (所有包含'value1'这个模式的字符串)
排序:select * from table1 order by field1,field2 [desc]
求和:select sum(field1) as sumvalue from table1
平均:select avg(field1) as avgvalue from table1
最大:select max(field1) as maxvalue from table1
最小:select min(field1) as minvalue from table1[separator]
热心网友 时间:2023-10-30 23:26
select 学生.学号 as 姓名, sum(成绩.分数) as 总分热心网友 时间:2023-10-30 23:27
update pstest set F_SUN = F_MATH + F_CH + F_EN;