Create a MySQL table named jobs and ensure that one of its columns, max_salary, is checked to not exceed the upper limit of 25000

MySQL Create Tables: Exercise-6 with Solution

6. Write a MySQL query to create a table named jobs including columns job_id, job_title, min_salary, max_salary and check whether the max_salary amount exceeding the upper limit 25000.

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)
    JOB_ID varchar(10) NOT NULL,

    -- Column to store job titles, marked as NOT NULL (required)
    JOB_TITLE varchar(35) NOT NULL,

    -- Column to store minimum salary with decimal precision of 6, 0
    MIN_SALARY decimal(6,0),

    -- Column to store maximum salary with decimal precision of 6, 0
    MAX_SALARY decimal(6,0),

    -- CHECK constraint to ensure that the maximum salary is less than or equal to 25,000
    CHECK(MAX_SALARY<=25000)
);

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   |     | NULL    |       |
| JOB_TITLE  | varchar(35)  | NO   |     | NULL    |       |
| MIN_SALARY | decimal(6,0) | YES  |     | NULL    |       |
| MAX_SALARY | decimal(6,0) | YES  |     | NULL    |       |
+------------+--------------+------+-----+---------+-------+
4 rows in set (0.16 sec)

Explanation:

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

• JOB_ID: Stores job IDs and is marked as NOT NULL to enforce the requirement of having a value in this column.
• JOB_TITLE: Stores job titles and is marked as NOT NULL to enforce the requirement of having a value in this column.
• MIN_SALARY: Stores minimum salary values with decimal precision of 6, 0.
• MAX_SALARY: Stores maximum salary values with decimal precision of 6, 0. Additionally, there is a CHECK constraint to ensure that the maximum salary is less than or equal to 25,000.

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