Write a postgre SQL statement to add a foreign key constraint named fk_job_id on job_id column of job_history table referencing to the primary key job_id of jobs table.
Here is the structure of the table jobs and job_history.
postgres=# \d jobs
Column | Type | Modifiers
------------+-----------------------+-----------
job_id | character varying(10) | not null
job_title | character varying(35) |
min_salary | numeric(6,0) |
max_salary | numeric(6,0) |
Indexes:
"jobs_pkey" PRIMARY KEY, btree (job_id)
postgres=# \d job_history
Column | Type | Modifiers
---------------+-----------------------+-----------
employee_id | numeric(6,0) |
start_date | date |
end_date | date |
job_id | character varying(10) |
department_id | numeric(4,0) |
Output:
Now see the structure of the table locations after being altered.
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