psycopg2 - UndefinedColumn: column "datetime" of relation "<table_name>" does not exist

Question

I'm getting this error message

UndefinedColumn: column "datetime" of relation "daily_price" does not exist
LINE 1: INSERT INTO public.daily_price (DateTime) VALUES ('200...
                                              ^

Code

cur.execute("INSERT INTO public.daily_price (DateTime) VALUES ('"+str(day)+"')");

How to deal with the reserved word column without altering it on the database?

Answer 1

As Tim Roberts points out, you have a different problem.

Here is sample SQL that uses DateTime as a column name and executes successfully:

CREATE TEMPORARY TABLE foo (DateTime timestamp);
INSERT INTO foo (DateTime) VALUES (now());

For completeness, here is what happens when you are truly using a reserved keyword that postgres objects to in context:

CREATE TEMPORARY TABLE foo (select timestamp);
INSERT INTO foo (select) VALUES (now());

ERROR:  syntax error at or near "select"
LINE 1: CREATE TEMPORARY TABLE foo (select timestamp);
                                    ^
ERROR:  syntax error at or near "VALUES"
LINE 1: INSERT INTO foo (select) VALUES (now());

To fix this case, you would use double-quotes:

CREATE TEMPORARY TABLE foo ("select" timestamp);
INSERT INTO foo ("select") VALUES (now());

This would work correctly - but this is not your problem. Something you are not seeing is wrong with the schema.