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Task  32:
The median is the amount such that half of the employees receive a salary higher than this amount, and half receive a salary lower than it.
Find the median salary according to the SALARY column of the EMPLOYEE table.
Display the result in the MEDIAN_SALARY column.

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To write the answer, use Firebird syntax. Descriptions of the tables are given in the right panel.

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Employee Database (Firebird)

Employee is a sample database that comes with the Firebird cross-platform database management system. You can use this database to explore Firebird SQL and other DBMS features.

Below is a list of this DB tables:

  • COUNTRY - table of countries.
  • JOB - table of jobs.
  • DEPARTMENT - table of departments.
  • EMPLOYEE - table of employees.
  • PROJECT - table of projects.
  • EMPLOYEE_PROJECT - table of employee to project relations.
  • PROJ_DEPT_BUDGET - table of project budgets.
  • SALARY_HISTORY - table of employees salary changes history.
  • CUSTOMER - table of customers.
  • SALES - table of sales.

Table COUNTRY

Table columns:
  • COUNTRY - Name of the country.
  • CURRENCY - Currency used in the country.
COUNTRY CURRENCY
USA Dollar

Table JOB

Table columns:
  • JOB_CODE - Job code.
  • JOB_GRADE - Job grade.
  • JOB_COUNTRY - Country associated with the job.
  • JOB_TITLE - Job title.
  • MIN_SALARY - Minimum salary for the job.
  • MAX_SALARY - Maximum salary for the job.
  • JOB_REQUIREMENT - Job requirements.
  • LANGUAGE_REQ - Language requirements.
JOB_CODE JOB_GRADE JOB_COUNTRY JOB_TITLE MIN_SALARY MAX_SALARY JOB_REQUIREMENT LANGUAGE_REQ
CEO 1 USA Chief Executive Officer 130000.00 250000.00 No specific requirements. [null]

Table DEPARTMENT

Table columns:
  • DEPT_NO - Department number.
  • DEPARTMENT - Department name.
  • HEAD_DEPT - Head department (can be null).
  • MNGR_NO - Manager number.
  • BUDGET - Department budget.
  • LOCATION - Department location.
  • PHONE_NO - Phone number for the department.
DEPT_NO DEPARTMENT HEAD_DEPT MNGR_NO BUDGET LOCATION PHONE_NO
000 Corporate Headquarters [null] 105 1000000.00 Monterey (408) 555-1234

Table EMPLOYEE

Table columns:
  • EMP_NO - Employee number.
  • FIRST_NAME - First name of the employee.
  • LAST_NAME - Last name of the employee.
  • PHONE_EXT - Phone extension for the employee.
  • HIRE_DATE - Date of employee's hire.
  • DEPT_NO - Department number.
  • JOB_CODE - Job code for the employee.
  • JOB_GRADE - Job grade for the employee.
  • JOB_COUNTRY - Country associated with the employee's job.
  • SALARY - Salary of the employee.
  • FULL_NAME - Full name of the employee.
EMP_NO FIRST_NAME LAST_NAME PHONE_EXT HIRE_DATE DEPT_NO JOB_CODE JOB_GRADE JOB_COUNTRY SALARY FULL_NAME
2 Robert Nelson 250 1988-12-28 00:00:00 600 VP 2 USA 105900.00 Nelson, Robert

Table PROJECT

Table columns:
  • PROJ_ID - Project ID.
  • PROJ_NAME - Project name.
  • PROJ_DESC - Project description.
  • TEAM_LEADER - Team leader for the project.
  • PRODUCT - Product associated with the project.
PROJ_ID PROJ_NAME PROJ_DESC TEAM_LEADER PRODUCT
VBASE Video Database Design a video database management system for controlling on-demand video distribution. 45 software

Table EMPLOYEE_PROJECT

Table columns:
  • EMP_NO - Employee number.
  • PROJ_ID - Project ID.
EMP_NO PROJ_ID
144 DGPII

Table PROJ_DEPT_BUDGET

Table columns:
  • FISCAL_YEAR - Fiscal year.
  • PROJ_ID - Project ID.
  • DEPT_NO - Department number.
  • QUART_HEAD_CNT - Quarter headcount (can be null).
  • PROJECTED_BUDGET - Projected budget for the fiscal year.
FISCAL_YEAR PROJ_ID DEPT_NO QUART_HEAD_CNT PROJECTED_BUDGET
1994 GUIDE 100 [null] 200000.00

Table SALARY_HISTORY

Table columns:
  • EMP_NO - Employee number.
  • CHANGE_DATE - Date of salary change.
  • UPDATER_ID - Updater ID.
  • OLD_SALARY - Previous salary.
  • PERCENT_CHANGE - Percentage change in salary.
  • NEW_SALARY - New salary after the change.
EMP_NO CHANGE_DATE UPDATER_ID OLD_SALARY PERCENT_CHANGE NEW_SALARY
28 1992-12-15 00:00:00 admin2 20000.00 10.000000 22000.000000

Table CUSTOMER

Table columns:
  • CUST_NO - Customer number.
  • CUSTOMER - Customer name.
  • CONTACT_FIRST - First name of the contact person.
  • CONTACT_LAST - Last name of the contact person.
  • PHONE_NO - Phone number for the customer.
  • ADDRESS_LINE1 - Address line 1.
  • ADDRESS_LINE2 - Address line 2 (can be null).
  • CITY - City of the customer.
  • STATE_PROVINCE - State or province of the customer.
  • COUNTRY - Country of the customer.
  • POSTAL_CODE - Postal code of the customer.
  • ON_HOLD - On hold status (can be null).
CUST_NO CUSTOMER CONTACT_FIRST CONTACT_LAST PHONE_NO ADDRESS_LINE1 ADDRESS_LINE2 CITY STATE_PROVINCE COUNTRY POSTAL_CODE ON_HOLD
1001 Signature Design Dale J. Little (619) 530-2710 15500 Pacific Heights Blvd. [null] San Diego CA USA 92121 [null]

Table SALES

Table columns:
  • PO_NUMBER - Purchase order number.
  • CUST_NO - Customer number associated with the order.
  • SALES_REP - Sales representative number.
  • ORDER_STATUS - Order status.
  • ORDER_DATE - Date of the order.
  • SHIP_DATE - Date of shipment.
  • DATE_NEEDED - Date needed (can be null).
  • PAID - Payment status.
  • QTY_ORDERED - Quantity ordered.
  • TOTAL_VALUE - Total value of the order.
  • DISCOUNT - Discount applied.
  • ITEM_TYPE - Type of item in the order.
  • AGED - Aged value.
PO_NUMBER CUST_NO SALES_REP ORDER_STATUS ORDER_DATE SHIP_DATE DATE_NEEDED PAID QTY_ORDERED TOTAL_VALUE DISCOUNT ITEM_TYPE AGED
V91E0210 1004 11 shipped 1991-03-04 00:00:00 1991-03-05 00:00:00 [null] y 10 5000.00 0.100000 hardware 1.000000000