SQL Exercise: Employees who joined on the given days in the year 1991
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45. From the following table, write a SQL query to identify all employees who joined the company on 1st May, 20th February, and 3rd December 1991. Return complete information about the employees.
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 | 2003-06-17 | AD_PRES | 24000.00 | 0.00 | 0 | 90 | | 101 | Neena | Kochhar | NKOCHHAR | 515.123.4568 | 2005-09-21 | AD_VP | 17000.00 | 0.00 | 100 | 90 | | 102 | Lex | De Haan | LDEHAAN | 515.123.4569 | 2001-01-13 | AD_VP | 17000.00 | 0.00 | 100 | 90 | | 103 | Alexander | Hunold | AHUNOLD | 590.423.4567 | 2006-01-03 | IT_PROG | 9000.00 | 0.00 | 102 | 60 | | 104 | Bruce | Ernst | BERNST | 590.423.4568 | 2007-05-21 | IT_PROG | 6000.00 | 0.00 | 103 | 60 | | 105 | David | Austin | DAUSTIN | 590.423.4569 | 2005-06-25 | IT_PROG | 4800.00 | 0.00 | 103 | 60 | | 106 | Valli | Pataballa | VPATABAL | 590.423.4560 | 2006-02-05 | IT_PROG | 4800.00 | 0.00 | 103 | 60 | | 107 | Diana | Lorentz | DLORENTZ | 590.423.5567 | 2007-02-07 | IT_PROG | 4200.00 | 0.00 | 103 | 60 | | 108 | Nancy | Greenberg | NGREENBE | 515.124.4569 | 2002-08-17 | FI_MGR | 12008.00 | 0.00 | 101 | 100 | | 109 | Daniel | Faviet | DFAVIET | 515.124.4169 | 2002-08-16 | FI_ACCOUNT | 9000.00 | 0.00 | 108 | 100 | ......... | 206 | William | Gietz | WGIETZ | 515.123.8181 | 2002-06-07 | AC_ACCOUNT | 8300.00 | 0.00 | 205 | 110 | +-------------+-------------+-------------+----------+--------------------+------------+------------+----------+----------------+------------+---------------+
Pictorial Presentation:
Sample Solution:
SELECT *
FROM employees
WHERE to_char(hire_date,'DD-MON-YY') IN ('01-MAY-91',
'20-FEB-91',
'03-DEC-91');
Sample Output:
emp_id |emp_name |job_name |manager_id |hire_date |salary |commission |dep_id | -------|---------|---------|-----------|-----------|--------|-----------|-------| 66928 |BLAZE |MANAGER |68319 |1991-05-01 |2750.00 | |3001 | 64989 |ADELYN |SALESMAN |66928 |1991-02-20 |1700.00 |400.00 |3001 | 69000 |JULIUS |CLERK |66928 |1991-12-03 |1050.00 | |3001 | 69062 |FRANK |ANALYST |65646 |1991-12-03 |3100.00 | |2001 |
Explanation:
The said query in SQL that selects all columns and rows from the 'employees' table where the hire_date column, after being formatted as a string with the 'DD-MON-YY' format, matches one of the specified strings '01-MAY-91', '20-FEB-91', or '03-DEC-91'.
Within "IN" operator, the WHERE clause includes employees hired on May 1st, 1991, February 20th, 1991, or December 3rd, 1991.
The "to_char" function converts the hire_date column into a string with the format, 'DD-MON-YY'.
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Practice Online
Sample Database: employees
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