Avoid Comma Separated values in table column Oracle 11g

Question

I am working on a Spring MVC based web application. I am using Oracle 11g and I need to normalize a table name "Employee" contained 100 columns, currently, I broke down the same in four different tables.

1. Emp_Personal_Detail
2. Emp_Official_Detail
3. Emp_Location_Detail
4. Emp_Banking_Detail

Now, the twist here is in Emp_Official_Detail. There is column name Function/Wing and Assigned_Section .

Function_Wing is Master table containing, Administration, Finance, Human Resources, IT, Automotive, Area Stor etc.

Similarly, Assigned_Section is Master table containing values

Bonds, IDPC, Joint Venture, Equity, Audit, Taxes etc.

For each employee, there will be one-to-many mapping for both the column. In a simple way, each employee is associated with multiple Function/Wing and also at the same time, each employee is also associated with multiple Assigned_Section .

What I did for now,

I just store the values by comma separation.

For example:

Emp_name: jones
Emp_code: 12321
Function/Wing: 1,2,3
Assigned_section:5,6

But I don't want to manage the values in such a manner. In the future, I need to display the data as well as implement the download excel functionality, as I experienced, that comma separated value degrades the query performance.

Right now I am in the development phase and I have time to finalize the things, so kindly suggest me, what is the best approach or best structure to follow, So it will be easily fetched efficiently.

Answer 1

You need two more tables to resolve this.

First Table for mapping Employee to Function/Wing mapping: Structure will be simple 2 columns: 1. Employee_code 2. Function/Wing

Second Table for mapping Employee to Assigned Section: Structure will be simple 2 columns: 1. Employee_code 2. Assigned_section