SQLite Exercise: Get the names of all the employees from employees table
Write a query to get the names (for example Ellen Abel, Sundar Ande etc.) of all the employees from employees 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 | | 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 :
-- Concatenating the "first_name," a space, the "last_name," and aliasing the result as 'Employee Name'
SELECT first_name || ' ' || last_name 'Employee Name'
-- Specifying the table from which to retrieve the data, in this case, "employees"
FROM employees;
Output:
Employee Name ---------------- Steven King Neena Kochhar Lex De Haan Alexander Hunold Bruce Ernst ... Pat Fay Susan Mavris Hermann Baer Shelley Higgins William Gietz
Explanation:
The above SQLite query retrieves a new column named 'Employee Name', which consists of the concatenation of "first_name," a space, and "last_name" for each record in the "employees" table. The result is a list of full names for each employee.
Here's a brief explanation of each part of SQLite code:
- SELECT clause:
- It concatenates the values in the "first_name" column, a space (' '), and the values in the "last_name" column.
- The concatenation is done using the || operator.
- Alias:
- The result of the concatenation is aliased as 'Employee Name'.
- FROM clause:
- Specifies the table from which to retrieve the data, in this case, the "employees" table.
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Model Database
Structure of 'hr' database :
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