sql data type best interview questions beginner level
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sql data type best interview questions beginner level
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SQL data types define the kind of data a column can store, such as integers, text, or dates, ensuring data integrity and consistency. Understanding the difference between `VARCHAR` and `CHAR` is crucial; `VARCHAR` stores variable-length text and uses space efficiently, whereas `CHAR` stores fixed-length text, padding with spaces as needed. The `DATE` data type is used to store date values without time, facilitating date-based queries and tracking. In contrast, `FLOAT` is used for approximate numeric values with floating decimal points, while `DECIMAL` provides exact numeric values with a fixed decimal point, essential for precise calculations. The `BOOLEAN` data type stores true or false values, ideal for representing binary conditions or choices. These fundamental concepts help maintain data quality and ensure accurate data management in SQL databases.