PostgreSQL "Column does not exist" but it actually does

sql postgresql quoted-identifier
BullyWiiPlaza picture BullyWiiPlaza · Jan 11, 2017 · Viewed 91k times · Source

I'm writing a Java application to automatically build and run SQL queries. For many tables my code works fine but on a certain table it gets stuck by throwing the following exception:

Exception in thread "main" org.postgresql.util.PSQLException: ERROR: column "continent" does not exist
  Hint: Perhaps you meant to reference the column "countries.Continent".
  Position: 8

The query that has been run is the following:

SELECT Continent
FROM network.countries
WHERE Continent IS NOT NULL
AND Continent <> ''
LIMIT 5

This essentially returns 5 non-empty values from the column.

I don't understand why I'm getting the "column does not exist" error when it clearly does in pgAdmin 4. I can see that there is a schema with the name Network which contains the table countries and that table has a column called Continent just as expected.

Since all column, schema and table names are retrieved by the application itself I don't think there has been a spelling or semantical error so why does PostgreSQL cause problems regardless? Running the query in pgAdmin4 nor using the suggested countries.Continent is working.

My PostgreSQL version is the newest as of now:

$ psql --version
psql (PostgreSQL) 9.6.1

How can I successfully run the query?

Answer

Eugene Lisitsky picture Eugene Lisitsky · Jan 11, 2017

Try to take it into double quotes - like "Continent" in the query:

SELECT "Continent"
FROM network.countries
...

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