The construction and organisation of a database are essential for carrying out any research project. Its construction influences the analysis, as well as the quality and success of the project itself. A well-designed and carefully structured database makes the most of the data collected. In addition, shortcomings in the initial structure are very common and can result in loss of information and delays during the analysis phase. Building a database requires a set of theoretical concepts and assumptions that must be properly safeguarded. In this course, we will address the main theoretical concepts associated with database construction, from a clear, focused, and practical perspective. Well-defined strategies for building databases will be presented, providing useful tools from planning, creation, organisation, and management in a simple, practical, and effective way.