Why Does My PostgreSQL Query Return a 'Relation Does Not Exist' Error Even With the Correct Table Name?

Solution to PostgreSQL query returning "relationship does not exist" error

Experiencing "relation does not exist" errors when executing database queries in PHP can be confusing, especially if the table names are correct. This problem usually arises from inconsistent case names in table names.

The key is to verify that the table name is spelled exactly as it is in the database. For example, if the table name contains mixed-case letters, you must enclose the table name in double quotes in the query. This ensures the exact case of the table referenced by the query. So if the table is defined as "SF_Bands" the query should be:

SELECT * FROM "SF_Bands";

Alternatively, you can avoid casing issues by modifying "search_path" to include the desired pattern. This allows you to reference a table name without having to specify its schema, and the query will search the schema sequentially until the table is found. To set the search path, execute the following command:

SET search_path TO showfinder,public;

Remember to adjust "showfinder" in the command to include the schema name of the table. By changing "search_path" you can avoid the need to specify a schema when referencing a table, thus minimizing case-related errors.

For more information on the "search_path" setting, see the PostgreSQL documentation:

https://www.php.cn/link/d7323519970d0e3680ef5fa1edfe0e56

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