Postgresql "Column Does Not Exist" But It Actually Does

PostgreSQL Column does not exist but it actually does

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

SELECT "Continent"
FROM network.countries
...

PostgreSQL column 'foo' does not exist

You accidentally created the column name with a trailing space and presumably phpPGadmin created the column name with double quotes around it:

create table your_table (
    "foo " -- ...
)

That would give you a column that looked like it was called foo everywhere but you'd have to double quote it and include the space whenever you use it:

select ... from your_table where "foo " is not null

The best practice is to use lower case unquoted column names with PostgreSQL. There should be a setting in phpPGadmin somewhere that will tell it to not quote identifiers (such as table and column names) but alas, I don't use phpPGadmin so I don't where that setting is (or even if it exists).

Getting column does not exist error in postgresql sql table

You need to use single quote instead of double quote

SELECT * FROM test where source = 'aaamt'

Postgresql Column Doesn't Exist

if you really have a camel case in you column name then you must wrap the column name with double quote

SELECT "CntrctTrmntnInd"  FROM return_part_i LIMIT 10;

PostgreSQL columns (object) name are case sensitive when specified with double quotes. Unquoted identifiers are automatically used as lowercase so the correct case sequence must be write with double quotes

and as correctly suggested by Raymond Nijland if you want a LIMIT in result you should use an order by

SELECT "CntrctTrmntnInd"  FROM return_part_i ORDER BY "CntrctTrmntnInd" LIMIT 10;

Postgresql column exists, but getting column of relation does not exist

If you have table names with upper case you have to enclose the table with double quotes

insert into messages( "replyDate") values('2021-05-07T11:33:36.721Z'),('2021-05-07T11:33:39.704Z'),('2021-05-07T11:33:42.414Z'),('2021-05-07T11:33:42.422Z'),('2021-05-07T11:33:49.454Z')

Are PostgreSQL column names case-sensitive?

Identifiers (including column names) that are not double-quoted are folded to lowercase in PostgreSQL. Column names that were created with double-quotes and thereby retained uppercase letters (and/or other syntax violations) have to be double-quoted for the rest of their life:

"first_Name"

Values (string literals / constants) are enclosed in single quotes:

'xyz'

So, yes, PostgreSQL column names are case-sensitive (when double-quoted):

SELECT * FROM persons WHERE "first_Name" = 'xyz';

Read the manual on identifiers here.

My standing advice is to use legal, lower-case names exclusively so double-quoting is not needed.

ERROR: column username of relation public.ae_User does not exist - Postgresql

You should use a double-quoted in the column name because Postgres is folded column to lowercase.

If the column contains uppercase (and/or other syntax violations) you have to use double-quoted

On other hand for text or varchar data has been passed to the column you have to use single-quoted

INSERT INTO "public"."public.ae_User" ("Name", "Username", "Email", "Password", "Salt", "User_type", "Deleted")
VALUES ('Miguel', 'adminMiguel', 'miguel@gmail.com', 'admin', 'bla', 3, false)

P.S:

In my opinion, better change your structure like below:

CREATE TABLE public."ae_User" (
    "Id" serial NOT NULL,
    "Name" character varying(30) NOT NULL,
    "Username" character varying(16) NOT NULL UNIQUE DEFAULT 'Guest',
    "Email" character varying(30) NOT NULL,
    "Password" character varying(120) NOT NULL,
    "Salt" character varying(40) NOT NULL,
    "User_type" int NOT NULL DEFAULT '0',
    "Deleted" BOOLEAN NOT NULL DEFAULT 'false',
    CONSTRAINT "ae_User_pk" PRIMARY KEY ("Id")
) WITH (
  OIDS=FALSE
);

INSERT INTO public."ae_User" ("Name", "Username", "Email", "Password", "Salt", "User_type", "Deleted")
VALUES ('Miguel', 'adminMiguel', 'miguel@gmail.com', 'admin', 'bla', 3, false)

PostgreSQL ERROR column does not exist refers to a column value

Use single quotes for literal strings. Double quotes stand for identifiers (such as column names or table names) - hence the error that you are getting:

INSERT INTO projects(id, project_name)
VALUES('1234', 'Test_Project')
ON CONFLICT (id)
DO NOTHING

That said, I would suspect that id is of integer datatype. If so, don't quote it at all:

INSERT INTO projects(id, project_name)
VALUES(1234, 'Test_Project')
ON CONFLICT (id)
DO NOTHING

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