Create a MySQL table named jobs with default values for job_title as blank, min_salary as 8000, and max_salary as NULL if no values are provided at runtime

MySQL Create Tables: Exercise-10 with Solution

10. Write a MySQL query to create a table named jobs including columns job_id, job_title, min_salary and max_salary, and make sure that, the default value for job_title is blank and min_salary is 8000 and max_salary is NULL will be entered automatically at the time of insertion if no value assigned for the specified columns.

Sample Solution:

-- Creating a table named 'jobs' if it doesn't already exist to store information about job positions

CREATE TABLE IF NOT EXISTS jobs(
    -- Column to store job IDs, marked as NOT NULL (required) and with a UNIQUE constraint
    JOB_ID varchar(10) NOT NULL UNIQUE,

    -- Column to store job titles, marked as NOT NULL (required) with a default value of an empty string
    JOB_TITLE varchar(35) NOT NULL DEFAULT ' ',

    -- Column to store minimum salary with decimal precision of 6, 0 and a default value of 8000
    MIN_SALARY decimal(6,0) DEFAULT 8000,

    -- Column to store maximum salary with decimal precision of 6, 0 and a default value of NULL
    MAX_SALARY decimal(6,0) DEFAULT NULL
);

Let execute the above code in MySQL command prompt

Here is the structure of the table:

mysql> DESC jobs;
+------------+--------------+------+-----+---------+-------+
| Field      | Type         | Null | Key | Default | Extra |
+------------+--------------+------+-----+---------+-------+
| JOB_ID     | varchar(10)  | NO   | PRI | NULL    |       |
| JOB_TITLE  | varchar(35)  | NO   |     |         |       |
| MIN_SALARY | decimal(6,0) | YES  |     | 8000    |       |
| MAX_SALARY | decimal(6,0) | YES  |     | NULL    |       |
+------------+--------------+------+-----+---------+-------+
4 rows in set (0.01 sec)

Explanation:

The said MySQL code creates a table named "jobs" if it doesn't already exist. The table has four columns:

• JOB_ID: Stores job IDs, marked as NOT NULL (required) and with a UNIQUE constraint to ensure each job has a unique identifier.
• JOB_TITLE: Stores job titles, marked as NOT NULL (required) with a default value of an empty string.
• MIN_SALARY: Stores minimum salary values with decimal precision of 6, 0, and a default value of 8000.
• MAX_SALARY: Stores maximum salary values with decimal precision of 6, 0, and a default value of NULL.

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