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Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482

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Chapter
Section
BuyFindarrow_forward

Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482
Chapter 8, Problem 20P
Textbook Problem
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Write a query to display the current salary for each employee in department 300. Assume that only current employees are kept in the system, and therefore the most current salary for each employee is the entry in the salary history with a NULL end date. Sort the output in descending order by salary amount.

Chapter 8, Problem 20P, Write a query to display the current salary for each employee in department 300. Assume that only

Program Plan Intro

SELECT statement:

It is used to retrieve information from the table or database. The syntax for the “SELECT” statement is given below:

Syntax:

SELECT * FROM table_Name;

WHERE clause:

“WHERE” statement is used limit the number of rows. For example: Consider a table “FTable” that has two columns named “FruitName” and “Color”. “WHERE” clause is used when there is a need to display the entire FruitName whose color is Red.

SELECT * FROM FTable WHERE color = 'red';

When the above statement is executed, red colored fruits get displayed.

Inner join:

The “inner join” keyword is to select the matching records from two tables. The syntax of “inner join” is as follows:

Syntax:

SELECT column_name FROM table1 INNER JOIN table2 ON table1.column_name=table2.column_name;

“AND” operator:

The operator used to check two or more conditions using single query. The “AND” operator returns “true” when two conditions are satisfied in the query.

ORDER BY Clause:

SQL contains “ORDER BY” clause in order to sort rows. The values get sorted in ascending as well as descending order. The keyword used to sort values in ascending order is “ASC” and for descending order is “DESC”. By default, it sorts values by ascending order.

Syntax:

SELECT column_Name1, column_Name2 FROM table_Name ORDER BY column_Name2;

Explanation of Solution

SQL code:

The SQL code to display the current salary of employee as 300 and salary history as NULL then finally sort the output in descending order by salary amount is given below:

SELECT E.EMP_NUM, E.EMP_LNAME, E.EMP_FNAME, S.SAL_AMOUNT FROM LGEMPLOYEE E INNER JOIN LGSALARY_HISTORY S ON E.EMP_NUM = S.EMP_NUM WHERE SAL_END IS NULL AND DEPT_NUM = 300 ORDER BY SAL_AMOUNT DESC;

Explanation:

  • The above query will display the employees “EMP_NUM...

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Chapter 8 Solutions

Database Systems: Design, Implementation, & Management
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