SQL How to select the lowest grade for a student in a certain time period

select min(score) from tablename where time>mintime and timemintime and time=starttime> and time<=endtime group by stuid;

Here's a reference, there's a lot to learn from this web.

The meaning is a little less clear, if you want to see the lowest grade for a single student over a period of time:

select min(score) from tablename where time>=starttime> and time<=endtime and stuid=?;

See all students' lowest grades in a certain period of time:

select min(score) from tablename where time>=starttime> and time<=endtime group by stuid;

The lookout doesn't meet your requirements.

select min (grade) as variable from table where time.

Here's a reference, there's a lot to learn from this web.

select * from table where date field = Start Date and Date field = Due Date.

and convert(char(8),date field,108)=Start time]and convert(char(8),date field,108)<=End time].

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It can be used across a wide range of platforms, from laptops running Microsoft Windows 98 to large, multiprocessor servers running Microsoft Windows 2012.

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Query each person's highest score sql:

First, use group by and max to get the highest score and subject, and then check the score table to find records with the same subject and score.

select b.* from (select max(score) t,course from score group by course) a,score b where and

The second way: get the highest score in the same subject first, and then query the score table to find the record with the highest scoreSelect * from score a where score=(select max(score) from score where course=

The third type: in the score table, when the subject is the same, there is no record with a score less than the score of other recordsSelect * from score a where not exists(select * from score where and

First, create a table and insert the test data:

create table test23

indexh int,name varchar(20),subject varchar(20),grade int

insert all

into test23 values(1,'Xiao Zhang','Language',70)into test23 values(2,'Xiao Zhang','English',90)into test23 values(3,'Xiao Wang','Language',89)into test23 values(4,'Xiao Wang','Mathematics',80)into test23 values(5,'Xiao Li','Mathematics',90)into test23 values(6,'Xiao Li','English',70)select * from dual

Of course, I'm using an oracle database, which may vary from database product to database.

Then check the record of each person's highest score, and indicate which subject they achieved.

select * from test23 t1where grade =(select max(grade) from test23 t2 where

The result of this is:

indexh name subject grade2 小張 English 90

3 Xiao Wang, Chinese 89

5 Xiao Li Math 90

If you want something else, let me know, ok?

You don't know how to describe this question in the first place.

The highest grade for each person, regardless of the highest in the subject?

I guess not.

Do you want to know the record of the highest grades in each subject?

select username, subject name, max from tablename

group by username, discipline name order by username, discipline name.

You can remove the later ones from order by, but I think you need them, and they will be sorted according to each subject for each student.

select the work number, max(grade) as the highest score.

from Transcript.

group by 工号.

select (max(grade field)) from table name group by (ID field for each person).

select username, max(grade) from tablename

group by username.

Check out the highest score of each person in a single subject.

stuscore (table name) score (score column).

select * from stuscore s1 where score = (select max(score) from stuscore s2 where )

Whether your time attribute is stored as a date type or as a character type.

select name, sum(performance) as total performance from x group by name.

Let's see if that works.

Goose goose hungry goose goose

select name,case when score<60 then fail when score=60 and score<80 then good when score=0 and score<90 then excellent end as result ,from table name.

Note that when you enter SQL statements, you need to enter them in English. Otherwise, ** is not recognized.

Extended content: Structured Query Language (SQL) is a database query and programming language used to access data and query, update, and manage relational database systems. SQL statements are a language that operates on databases.

Some examples of SQL statements are as follows:

Database: create database database-name

To delete data, drop database dbname

Create table tabname(col1 type1 [not null] [primary key],col2 type2 [not null],

Delete a new table: drop table tabname

Added: alter table tabname add column col type

Set the primary key: alter table tabname add primary key(col).

Delete the primary key: alter table tabname drop primary key (col).

Create [unique] index idxname on tabname(col.....))

To delete an index, drop index idxname

Create View ViewName as Select Statement

Drop View ViewName

select sname,sno,sscore,status=case when sscore <60 then'Fail' when sscore >=60 and sscore <80 then 'Good when sscore>=80 and sscore <90 then'Excellent' when sscore >=90 then 'Excellent' end

from Student Table.

You can give it a try.

--Use the windowing function to sort each user's grades.

select * from

select t.*,row number(partition by username order by result desc) as flag from table name t).

where flag <=3