Difference between CHAR, VARCHAR, and TEXT data types in PostgreSQL

In PostgreSQL, CHAR, VARCHAR, and TEXT are all data types used to store character data. However, there are some key differences between them:

• CHAR: CHAR is a fixed-length character data type. When you define a column as CHAR(n), it will always store exactly n characters, padding with spaces if the input string is shorter. This can be useful when you need a fixed-length field, such as for storing codes or IDs.
• VARCHAR: VARCHAR is a variable-length character data type. When you define a column as VARCHAR(n), it will store up to n characters, but will only use as much space as needed. This can be more efficient for storing variable-length text data like names or descriptions.
• TEXT: TEXT is also a variable-length character data type, similar to VARCHAR. However, TEXT has no specified length limit, allowing you to store large amounts of text data without worrying about truncation. This makes it suitable for storing lengthy textual content like articles or comments.

It's important to choose the appropriate data type based on the specific requirements of your application to optimize storage space and performance.