PostgreSQL Basic SELECT Statement: Select first ten records from a table
18. Write a query to select first ten records from a table.
Sample Solution:
Code:
-- Selecting the employee ID and first name from the employees table, limiting the result to the first 10 rows
SELECT employee_id, first_name
-- Selecting data from the employees table
FROM employees
-- Limiting the result set to the first 10 rows
LIMIT 10;
Explanation:
- This SQL code selects the employee ID and first name from the "employees" table.
- It limits the result set to include only the first 10 rows using the LIMIT clause.
- The result set will contain employee IDs and first names for the first 10 employees in the employees table, based on the default ordering of the table.
Sample table: employees
+-------------+-------------+-------------+----------+--------------------+------------+------------+----------+----------------+------------+---------------+ | EMPLOYEE_ID | FIRST_NAME | LAST_NAME | EMAIL | PHONE_NUMBER | HIRE_DATE | JOB_ID | SALARY | COMMISSION_PCT | MANAGER_ID | DEPARTMENT_ID | +-------------+-------------+-------------+----------+--------------------+------------+------------+----------+----------------+------------+---------------+ | 100 | Steven | King | SKING | 515.123.4567 | 1987-06-17 | AD_PRES | 24000.00 | 0.00 | 0 | 90 | | 101 | Neena | Kochhar | NKOCHHAR | 515.123.4568 | 1987-06-18 | AD_VP | 17000.00 | 0.00 | 100 | 90 | | 102 | Lex | De Haan | LDEHAAN | 515.123.4569 | 1987-06-19 | AD_VP | 17000.00 | 0.00 | 100 | 90 | | 103 | Alexander | Hunold | AHUNOLD | 590.423.4567 | 1987-06-20 | IT_PROG | 9000.00 | 0.00 | 102 | 60 | | 104 | Bruce | Ernst | BERNST | 590.423.4568 | 1987-06-21 | IT_PROG | 6000.00 | 0.00 | 103 | 60 | | 105 | David | Austin | DAUSTIN | 590.423.4569 | 1987-06-22 | IT_PROG | 4800.00 | 0.00 | 103 | 60 | | 106 | Valli | Pataballa | VPATABAL | 590.423.4560 | 1987-06-23 | IT_PROG | 4800.00 | 0.00 | 103 | 60 | | 107 | Diana | Lorentz | DLORENTZ | 590.423.5567 | 1987-06-24 | IT_PROG | 4200.00 | 0.00 | 103 | 60 | | 108 | Nancy | Greenberg | NGREENBE | 515.124.4569 | 1987-06-25 | FI_MGR | 12000.00 | 0.00 | 101 | 100 | .......... | 206 | William | Gietz | WGIETZ | 515.123.8181 | 1987-10-01 | AC_ACCOUNT | 8300.00 | 0.00 | 205 | 110 | +-------------+-------------+-------------+----------+--------------------+------------+------------+----------+----------------+------------+---------------+
Output:
pg_exercises=# SELECT employee_id, first_name
pg_exercises-# FROM employees LIMIT 10;
employee_id | first_name
-------------+------------
100 | Steven
101 | Neena
102 | Lex
103 | Alexander
104 | Bruce
105 | David
106 | Valli
107 | Diana
108 | Nancy
109 | Daniel
(10 rows)
Go to:
PREV : Write a query to check whether the first_name column of the employees table containing any number.
NEXT : Write a query to get a monthly salary (rounded up to 2 decimal places) of each employee.
Practice Online
Have another way to solve this solution? Contribute your code (and comments) through Disqus.
What is the difficulty level of this exercise?
