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Task 21: 
Find employees whose salaries were increased several times within one year.
The result should contain the following columns EMP_NO, FIRST_NAME, LAST_NAME - employee data, CHANGES_YEAR - year of salary increase, CHANGES_COUNT - number of increases per year. Sort the result by employee number

Use Firebird syntax to write your answer. Descriptions of tables are provided in the right pane.

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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 - countries table.
  • COUNTRYName of the country.
  • CURRENCYCurrency used in the country.
COUNTRY CURRENCY
USA Dollar
JOB - company's staff schedule.
  • JOB_CODEJob code.
  • JOB_GRADEJob grade.
  • JOB_COUNTRYCountry associated with the job.
  • JOB_TITLEJob title.
  • MIN_SALARYMinimum salary for the job.
  • MAX_SALARYMaximum salary for the job.
  • JOB_REQUIREMENTJob requirements.
  • LANGUAGE_REQLanguage 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]
DEPARTMENT - company divisions.
  • DEPT_NODepartment number.
  • DEPARTMENTDepartment name.
  • HEAD_DEPTHead department (can be null).
  • MNGR_NOManager number.
  • BUDGETDepartment budget.
  • LOCATIONDepartment location.
  • PHONE_NOPhone number for the department.
DEPT_NO DEPARTMENT HEAD_DEPT MNGR_NO BUDGET LOCATION PHONE_NO
000 Corporate Office [null] 105 1000000.00 Monterey (408) 555-1234
EMPLOYEE - list of employees.
  • EMP_NOEmployee number.
  • FIRST_NAMEFirst name of the employee.
  • LAST_NAMELast name of the employee.
  • PHONE_EXTPhone extension for the employee.
  • HIRE_DATEDate of employee's hire.
  • DEPT_NODepartment number.
  • JOB_CODEJob code for the employee.
  • JOB_GRADEJob grade for the employee.
  • JOB_COUNTRYCountry associated with the employee's job.
  • SALARYSalary of the employee.
  • FULL_NAMEFull 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
PROJECT - list of projects.
  • PROJ_IDProject ID.
  • PROJ_NAMEProject name.
  • PROJ_DESCProject description.
  • TEAM_LEADERTeam leader for the project.
  • PRODUCTProduct associated with the project.
PROJ_ID PROJ_NAME PROJ_DESC TEAM_LEADER PRODUCT
VBASE Video Database Development of a video database management system for managing video distribution on demand. 45 software
EMPLOYEE_PROJECT - employee-project mapping.
  • EMP_NOEmployee number.
  • PROJ_IDProject ID.
EMP_NO PROJ_ID
144 DGPII
PROJ_DEPT_BUDGET - project budgets.
  • FISCAL_YEARFiscal year.
  • PROJ_IDProject ID.
  • DEPT_NODepartment number.
  • QUART_HEAD_CNTQuarter headcount (can be null).
  • PROJECTED_BUDGETProjected budget for the fiscal year.
FISCAL_YEAR PROJ_ID DEPT_NO QUART_HEAD_CNT PROJECTED_BUDGET
1994 GUIDE 100 [null] 200000.00
SALARY_HISTORY - history of employee salary changes.
  • EMP_NOEmployee number.
  • CHANGE_DATEDate of salary change.
  • UPDATER_IDUpdater ID.
  • OLD_SALARYPrevious salary.
  • PERCENT_CHANGEPercentage change in salary.
  • NEW_SALARYNew 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
CUSTOMER - company clients.
  • CUST_NOCustomer number.
  • CUSTOMERCustomer name.
  • CONTACT_FIRSTFirst name of the contact person.
  • CONTACT_LASTLast name of the contact person.
  • PHONE_NOPhone number for the customer.
  • ADDRESS_LINE1 Address line 1.
  • ADDRESS_LINE2Address line 2 (can be null).
  • CITYCity of the customer.
  • STATE_PROVINCEState or province of the customer.
  • COUNTRYCountry of the customer.
  • POSTAL_CODEPostal code of the customer.
  • ON_HOLDOn 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]
SALES - list of sales.
  • PO_NUMBERPurchase order number.
  • CUST_NOCustomer number associated with the order.
  • SALES_REPSales representative number.
  • ORDER_STATUSOrder status.
  • ORDER_DATEDate of the order.
  • SHIP_DATEDate of shipment.
  • DATE_NEEDEDDate needed (can be null).
  • PAIDPayment status.
  • QTY_ORDEREDQuantity ordered.
  • TOTAL_VALUETotal value of the order.
  • DISCOUNTDiscount applied.
  • ITEM_TYPEType of item in the order.
  • AGEDAged 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
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