PostgreSQL Create Table: Create a table to restrict the upper limit for a column
6. Write a SQL statement to create a table named jobs, including job_id, job_title, min_salary, max_salary and check whether the max_salary amount exceeding the upper limit 25000.
Sample Solution:
Code:
CREATE TABLE IF NOT EXISTS jobs (
JOB_ID varchar(10) NOT NULL ,
JOB_TITLE varchar(35) NOT NULL,
MIN_SALARY decimal(6,0),
MAX_SALARY decimal(6,0)
CHECK(MAX_SALARY<=25000)
);
Output:
postgres=# CREATE TABLE IF NOT EXISTS jobs ( postgres(# JOB_ID varchar(10) NOT NULL , postgres(# JOB_TITLE varchar(35) NOT NULL, postgres(# MIN_SALARY decimal(6,0), postgres(# MAX_SALARY decimal(6,0) postgres(# CHECK(MAX_SALARY<=25000) postgres(# ); CREATE TABLE
Here is command to see the structure of the created table :
postgres=# \d jobs;
Table "public.jobs"
Column | Type | Modifiers
------------+-----------------------+-----------
job_id | character varying(10) | not null
job_title | character varying(35) | not null
min_salary | numeric(6,0) |
max_salary | numeric(6,0) |
Check constraints:
"jobs_max_salary_check" CHECK (max_salary <= 25000::numeric)
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Previous: Write a SQL statement to create a table countries, set a constraint NULL.
Next: Write a SQL statement to create a table named countries, including country_id, country_name and region_id and make sure that no countries except Italy, India and China will be entered in the table.
What is the difficulty level of this exercise?
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