ERROR: column of relation does not exist PostgreSQL ,Unable to run insert query

Question

Hi I am trying to insert into a table tester3 it fails when i use the syntax

insert into tester3 (UN0, UN1) values ( 1, 'jishnu1');

but

insert into tester3 values ( 1, 'jishnu1');

is working fine.

mydb=# CREATE TABLE tester3
mydb-#    (
mydb(#     "UN0" integer,
mydb(#     "UN1" VARCHAR(40)
mydb(#    );
CREATE TABLE
mydb=# insert into tester3 (UN0, UN1) values ( 1, 'jishnu1');
ERROR:  column "un0" of relation "tester3" does not exist
mydb=# \d tester3
           Table "public.tester3"
 Column |         Type          | Modifiers
--------+-----------------------+-----------
 UN0    | integer               |
 UN1    | character varying(40) |

I think i am missing something very trivial, I tried someother column names some of them works fine and some are not working. I am confused. Does PostgreSQL have restriction in column names for which works the 1st syntax of insert query works?

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Edit :

Checkout Girdon Linoff answer and as Frank Heikens pointed out the other column names which was working without quotes where in lower case.

Lower case column is the standard within PostgreSQL and also works without quotes

Answer 1

If you define the columns with double quotes, then you generally need to use them when you refer to the column:

insert into tester3 ("UN0", "UN1")
     values ( 1, 'jishnu1');

I would suggest you remove the double quotes from the column names in the CREATE TABLE statement.

You don't need the double quotes if the name is all lower case.