Database Knowledge is essential for

Database Knowledge is essential for several professions

If your career is in Information Technology :

You will play a key role in providing Data Management Tools and expertise to
the firm.
You will be expected to Design Databases, implement and maintain Database Technology, and help promote Data Administration Policies and Procedures.

If your career is in Finance and Accounting:

You will be using Databases to deal with Financial transactions such as Payments, Invoices, or Credit history. Or you will be working solidly with a massive Databases housing data about Security Stock prices , Investment Portfolios and Economic statistics.