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Study Note54

Normalization & Denormalization Normalization Normalization in data analysis refers to the process of organizing a database efficiently to reduce redundancy and improve data integrity and efficiency. The three stages of normalization—first normal form (1NF), second normal form (2NF), and third normal form (3NF)—each address specific types of data redundancy and dependencies. 1. First Normal Form (1NF): Ensures that each column.. 2024. 4. 22.
Waterfall Model & Agile Model Waterfall Model: Characteristics: The waterfall model follows a sequential and linear approach. Each phase must be completed before the next one begins. Key phases include requirements definition, design, implementation, testing, and maintenance. Advantages: Each phase is clearly defined, making it easy to track the progress of the project. It's easy to assess the impact of requirement or design.. 2024. 4. 17.
Importance of data modeling Ripple Effect: Data modeling plays a crucial role in minimizing the ripple effect of changes on the database. A well-designed data model reduces the impact of modifications to data structures on other parts of the system. For example, if changes are made to the attributes of one entity in the data model without affecting other entities, it reduces the effort required for system maintenance and u.. 2024. 4. 17.
How to add localhost at DBeaver (MY SQL) An error occurred during the process of converting text to numbers in DBeaver. When importing a CSV file into DBeaver, it failed to recognize text as numbers, resulting in this error. T o resolve this, MySQL Community was installed and localhost was configured. Now, I will explain how to set up localhost after installing MySQL Community. This is my first screen and I will create 'locahost_v2' Yo.. 2024. 4. 16.
Having The HAVING clause in SQL is used to filter the result set returned by a GROUP BY clause.  It allows you to apply conditions to groups of rows rather than individual rows.  This is particularly useful when you want to filter groups based on aggregate functions, such as SUM, AVG, MIN, MAX, etc. Here are some examples:  Using SUM with HAVING:SELECT department, SUM(sales) AS total_salesFROM sales_ta.. 2024. 4. 11.
Modeling In SQL, modeling refers to the process of designing and defining the structure of a database. It involves defining tables, columns, relationships, and constraints to meet the requirements of the database. Modeling in SQL typically includes the following elements: Conceptual Modeling: Conceptual modeling involves designing the overall structure of the database based on business requirements and c.. 2024. 4. 9.

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