“Divisez une base de données en tables connexes en fonction de leur structure dans MySQL” Réponses codées

Divisez une base de données en tables connexes en fonction de leur structure dans MySQL

CREATE TABLE old_table (name VARCHAR(255), id BIGINT, colg VARCHAR(255), schol VARCHAR(255), addit VARCHAR(255), no VARCHAR(255), subject VARCHAR(255), marks VARCHAR(255), surname VARCHAR(255), lectures VARCHAR(255));

INSERT INTO old_table VALUES("shaun", 1234, "DePaul University", "Computing and Digital Media", "something", "something", "some subject", "A", "Husain","no thank you");

mysql> SELECT * FROM old_table;
+-------+------+-------------------+-----------------------------+-----------+-----------+--------------+-------+---------+--------------+
| name  | id   | colg              | schol                       | addit     | no        | subject      | marks | surname | lectures     |
+-------+------+-------------------+-----------------------------+-----------+-----------+--------------+-------+---------+--------------+
| shaun | 1234 | DePaul University | Computing and Digital Media | something | something | some subject | A     | Husain  | no thank you |
+-------+------+-------------------+-----------------------------+-----------+-----------+--------------+-------+---------+--------------+
1 row in set (0.00 sec)

CREATE TABLE table1 (name VARCHAR(255), id BIGINT PRIMARY KEY, colg VARCHAR(255), schol VARCHAR(255), addit VARCHAR(255), no VARCHAR(255));
CREATE TABLE table2 (id BIGINT PRIMARY KEY, subject VARCHAR(255), marks VARCHAR(255), surname VARCHAR(255), lectures VARCHAR(255));

INSERT INTO table1 (name,id,colg,schol,addit,no) SELECT name,id,colg,schol,addit,no from old_table;
INSERT INTO table2 (id,subject,marks,surname,lectures) SELECT id,subject,marks,surname,lectures from old_table;

mysql> select * from table1;
+-------+------+-------------------+-----------------------------+-----------+-----------+
| name  | id   | colg              | schol                       | addit     | no        |
+-------+------+-------------------+-----------------------------+-----------+-----------+
| shaun | 1234 | DePaul University | Computing and Digital Media | something | something |
+-------+------+-------------------+-----------------------------+-----------+-----------+
1 row in set (0.00 sec)

mysql> select * from table2;
+------+--------------+-------+---------+--------------+
| id   | subject      | marks | surname | lectures     |
+------+--------------+-------+---------+--------------+
| 1234 | some subject | A     | Husain  | no thank you |
+------+--------------+-------+---------+--------------+
1 row in set (0.00 sec)

mysql> select * from table1 LEFT JOIN table2 on (table1.id=table2.id);
+-------+------+-------------------+-----------------------------+-----------+-----------+------+--------------+-------+---------+--------------+
| name  | id   | colg              | schol                       | addit     | no        | id   | subject      | marks | surname | lectures     |
+-------+------+-------------------+-----------------------------+-----------+-----------+------+--------------+-------+---------+--------------+
| shaun | 1234 | DePaul University | Computing and Digital Media | something | something | 1234 | some subject | A     | Husain  | no thank you |
+-------+------+-------------------+-----------------------------+-----------+-----------+------+--------------+-------+---------+--------------+
1 row in set (0.00 sec)