SQLite Exercise: Get the employee ID, names, salary in ascending order of salary
Write a query to get the employee ID, names (first_name, last_name), salary in ascending order of salary.
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 | | 109 | Daniel | Faviet | DFAVIET | 515.124.4169 | 1987-06-26 | FI_ACCOUNT | 9000.00 | 0.00 | 108 | 100 | ........ | 206 | William | Gietz | WGIETZ | 515.123.8181 | 1987-10-01 | AC_ACCOUNT | 8300.00 | 0.00 | 205 | 110 | +-------------+-------------+-------------+----------+--------------------+------------+------------+----------+----------------+------------+---------------+
SQLite Code:
-- Selecting the "employee_id," "first_name," "last_name," and "salary" columns
-- Specifying the table from which to retrieve the data, in this case, "employees"
SELECT employee_id, first_name, last_name, salary
-- Sorting the result set in ascending order based on the "salary" column
FROM employees ORDER BY salary;
Output:
employee_id first_name last_name salary ----------- ---------- ---------- ---------- 132 TJ Olson 2100 128 Steven Markle 2200 136 Hazel Philtanker 2200 127 James Landry 2400 135 Ki Gee 2400 ... ... ... .... 146 Karen Partners 13500 145 John Russell 14000 101 Neena Kochhar 17000 102 Lex De Haan 17000 100 Steven King 24000
Explanation:
The above query fetches employee information (ID, first name, last name, and salary) from the "employees" table and arranges the results in ascending order of salary.
Here's a brief explanation of each part of SQLite code:
- SELECT clause:
- It retrieves specific columns from the "employees" table, namely "employee_id," "first_name," "last_name," and "salary."
- FROM clause:
- Specifies the table from which to retrieve the data, in this case, the "employees" table.
- ORDER BY clause:
- Orders the result set in ascending order based on the values in the "salary" column.
Relational Algebra Expression:
Relational Algebra Tree:
Go to:
PREV : Write a query to get the names (first_name, last_name), salary, PF of all the employees (PF is calculated as 12% of salary).
NEXT : Write a query to get the total salaries payable to employees.
Practice SQLite Online
Model Database
Structure of 'hr' database :
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