Why Does My PostgreSQL DELETE Statement Fail with 'Error: Column does not exist'?

Troubleshooting "Error: Column does not exist" When Deleting From PostgreSQL

While attempting to delete records from a PostgreSQL table using Java JDBC, you may encounter an error indicating that the column specified in the DELETE query does not exist. To resolve this issue, consider the following:

Escaping Entity Name Case Sensitivity

PostgreSQL is case-sensitive for entity names (e.g., table and column names). If your column name contains uppercase letters, you must enclose it in double quotes ("") to escape case sensitivity.

For example, if your column is named "MAC", modify your query as follows:

String stm = "DELETE FROM hostdetails WHERE \"MAC\" = 'kzhdf'";

Avoid Direct Value Setting in Prepared Statements

Using pst.executeUpdate() with direct value setting in prepared statements is not recommended. Instead, use pst.setString(1, "kzhdf") to set the parameter value safely.

String stm = "DELETE FROM hostdetails WHERE \"MAC\" = ?";
...
pst.setString(1, "kzhdf");
pst.executeUpdate();

This ensures that any potential special characters or SQL injection attempts are safely handled.

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