Implementing new table

[gmc1103]

Hi

 

I would to have some opinions about a new task i have regarding inserting records into database

 

This is school scenario

 

The school has private lessons and the principal wants to know wich students going to get in the end of the year a full report

The students belongs to class

The private lessons can have several classes

 

So when i will insert records into database wich approach i must follow

1- Insert by class then choose every student of that class

2- Insert by students and then by student id i can get his class

3- another one

 

Thank you for any opinion

[Barand]

Not sure we have the full picture yet

 

Can a student belong to more than one class?

Can a student have more than one private lesson?

Can a class have more than one one private lesson?

[gmc1103]

Not sure we have the full picture yet

 

Can a student belong to more than one class?

Can a student have more than one private lesson?

Can a class have more than one one private lesson?

 

Can a student belong to more than one class? No, a student belong to one class only (ex 10ºA)

Can a student have more than one private lesson? Yes but not in same time (Ex can have English, Maths in different hours time)

Can a class have more than one one private lesson? yes (One private lesson can have class A and B and more)

[gmc1103]

What i have so far is

 

Table class

CREATE TABLE `esmaior_turma` (
  `id_turma` int(11) NOT NULL AUTO_INCREMENT,
  `turma` varchar(100) COLLATE utf8_bin NOT NULL,
  `estado` tinyint(1) NOT NULL,
  PRIMARY KEY (`id_turma`)
) ENGINE=InnoDB AUTO_INCREMENT=37 DEFAULT CHARSET=utf8 COLLATE=utf8_bin

and table students

Create Table

CREATE TABLE `esmaior_alunos` (
  `id_aluno` int(11) NOT NULL AUTO_INCREMENT,
  `user_proc` int(11) NOT NULL,
  `user_name` varchar(200) COLLATE utf8_bin NOT NULL,
  `user_id_ano_turma` int(11) NOT NULL,
  `user_num_turma` int(20) NOT NULL,
  PRIMARY KEY (`id_aluno`),
  KEY `user_id_ano_turma` (`user_id_ano_turma`),
  CONSTRAINT `esmaior_alunos_ibfk_1` FOREIGN KEY (`user_id_ano_turma`) REFERENCES `esmaior_turma` (`id_turma`)
) ENGINE=InnoDB AUTO_INCREMENT=50 DEFAULT CHARSET=utf8 COLLATE=utf8_bin

Now i need to think about a table where i can insert records by id_user, what i pretend to to is:

 

When the teacher add new record, he select the class, then select all the students (user_id) presents of that classes and when i make a query by user_id i can check all the lessons he went..

[Barand]

From what you have said, a lesson can have many classes and each class has many lessons. You therefore have a many-to-many relationship between class and lesson. This would be resolved by using another table to link the two. In this case I suggest it could be a "timetable" table which schedules when each class has a lesson. (See attached model)

 

Given a class it is then easy to find the students in that class.

 

Following the links in the diagram you can find which lessons a student has.

Edited February 11, 2016 by Barand

[gmc1103]

Hi Barand, i will try to implement your schema.

Any doubt i will open a new topic

Thank you again.