Question

i have a scenario, in which i have to create a table with following fields

department_name, ministry_name, domain_name, coordinator_name, coordinator_email

now, for each department_name there can be more than one coordinator_name and corresponding to it more than one coordinator_email.

i can’t do this in one table(department) because i can’t store two coordinator name and their coordinator email in a single row of mysql.

so i planned to make one table(coordinator) with department_name(primary key), ministry_name, domain_name
and second table with department_name(primary key), coordinator_name, coordinator_email with a foreign key reference to department(department_name)

now how can i use insert statement so that the data gets inserted in both tables at once. and similarly how can i use delete and update statement…

please help… thankyou…

Answer 1

1. You could use one table

Department A – Ministry – Domain – Coordinator A – Coordinator E-mail A

Department A – Ministry – Domain – Coordinator B – Coordinator E-mail B

Department A – Ministry – Domain – Coordinator C – Coordinator E-mail C

Department B – Ministry – Domain – Coordinator A – Coordinator E-mail A

If you just need Departments, you disregard coordinators’ information and group it by department? Unless you specifically want two tables?

1. You could use TRIGGERS to achieve that, trigger will happen every time INSERT, UPDATE, DELETE is executed.

2. Split it in two different tables

Coordinator: id, name, email, departmentId (Foreign Key to Departments.id)
Departments: id, name, ministry, domain

Then Foreign key will take care of updates and deletions (will remove all coordinators if department is deleted)

— edit

Then first you loop through departments:

SELECT DISTINCT(department_name) FROM your_table

and if then second loop is to display all coordinators for each department

SELECT * FROM your_table WHERE department_name = ”