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 (Figure P7.48).   figure48 EMP_NUM EMP_LNAME EMP_FNAME SAL_AMOUNT 83695 MENDEZ CARROLL 79200 83716 RIVERA HENRY 85920 84594 TIDWELL ODELL 77400 83910 AVERY LAUREN 76110 83359 WATTS MERLE 72240 84500 WESTON CHRISTINE 78690 84328 CARPENTER FERN 94090 84432 JAMISON MERLE 85360 83902 VARGAS ROCKY 79540 83746 RANKIN SEAN 95550 83790 ACEVEDO LAVINA 72000   figure47 EMP_FNAME EMP_LNAME CUST_NAME CUST_LNAME INV_DATE INV_TOTAL John Doe Customer 1 Doe 01-May-2022 100     tables being used are: figure47 and figure48

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Single Table

In a database management system, a single table is designed to obtain data of heterogeneous items. A single-table design with DynamoDB resolves the issue of raising multiple requests for the relevant data of an entity.