Mysql--- query the top 5 students

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demand ： The query result is top 5 Students of

After getting the demand , First analyze the requirements , Find out the screening conditions

One 、Mysql Inquire about

1、 The most basic query

select * from table where name="panpan"

2、 Check before 5 name
stay mysql Top of the filtered data in , You can use keywords ：limit

select * from table where name="panpan" limit 1

explain ： The name in the query table is panpan The first record

3、 Under what conditions , The demand is to screen by achievements , You can use order by Sort filter

select * from table where order by grade

Two 、 Query application

Query after merging ：

select * from score order by grade limit 5

explain ： Query to score Exterior and interior grade , With grade Screening , Before extraction 5 Bar record