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mysql 和并列

kicked off Wednesday in the northea

直接在语句后面写order by 得分这个字段,

select * from message where (typeid=31) or (typeid=30) or (typeid=32) or (typeid=33) order by id desc; 或者 select * from message where typeid IN ( 31, 30, 32, 33) order by id desc;

select * from (select Student.S#,Sname,Sage,Ssex,SC.C#,score,Cname from SC inner join Student on SC.S#=Student.S# inner join Course on Course.C#=SC.C#) as t where exists( select count(1) from t as d where C#=d.C# and score < d....

select * from table where a='xxx' and b='xxx'

where后加多个条件可以用and来连接。 如,student表中有如下数据: 现在要查,sex为男,age为20的那些数据,可用如下语句: select * from student where ...

首先 判断 变量 是否存在,然后动态生成 sql 查询条件。 php 类似代码如下:

mysql> show table status like 'tb%'\G*************************** 1. row *************************** Name: tb_account Engine: InnoDB Version: 10 Row_format: Compact Rows: 27010 Avg_row_length: 175 Data_length: 4734976Max_data_le...

ORDER BY 成绩 DESC,时间 DESC

select *,sum(grades) as gradesSum from grade group by num order by gradesSum DESC

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