Are PostgreSQL Column Names Case-Sensitive?

Detailed explanation of case sensitivity of PostgreSQL database column names

When working with a PostgreSQL database, it is critical to understand the case sensitivity of column names. As highlighted in the question, encountering errors like "column does not exist" can be confusing.

PostgreSQL treats unquoted identifiers (including column names) as case-insensitive. This means "first_Name" and "FIRST_NAME" are considered the same. However, when double quotes are used, the original case is preserved and becomes significant.

For example, consider the following column name:

• "first_Name": "N" remains uppercase.
• "1st_Name": The leading number is retained.
• "AND": Reserved words are reserved.

In contrast, do not use double quotes:

• first_Name: Convert to lowercase "first_name".
• 1st_Name: syntax error due to leading digits.
• AND: Syntax error due to reserved words.

Note that values ​​are specified using single quotes and are case-sensitive. Therefore, 'xyz' is not the same as 'XYZ'.

So, the answer to the question "Are PostgreSQL column names case-sensitive?" is: Yes, but only when using double quotes. To ensure compatibility, it is recommended to use consistent lowercase names without double quotes. By adhering to this convention, you can avoid errors related to case sensitivity.

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