Why Does My SQL Query Fail Due to Case-Sensitive Column Names in PostgreSQL?

Case sensitivity of column names in SQL

The following SQL statement causes an error due to column name case mismatch.

The error message "column "FK_Numbers_id" does not exist" indicates that PostgreSQL cannot find the specified column in the table. However, after checking the table schema, the column does exist, just with a slightly different name.

In PostgreSQL, column names are case-sensitive. This means "FK_Numbers_id" and "fk_numbers_id" are treated as different columns. However, the table schema shows that the column exists and is named "FK_Numbers_id".

Therefore, the correct SQL statement should be:

<code class="language-sql">select sim.id as idsim, 
       num.id as idnum 
from main_sim sim 
  left join main_number num on ("FK_Numbers_id" = num.id);</code>

The SQL statement explicitly references the case-sensitive column names in the table schema by enclosing the column names in double quotes. This resolves the error and allows the query to run successfully.

The above is the detailed content of Why Does My SQL Query Fail Due to Case-Sensitive Column Names in PostgreSQL?. For more information, please follow other related articles on the PHP Chinese website!