Postgresql tables exists, but getting "relation does not exist" when querying

I hit this error and it turned out my connection string was pointing to another database, obviously the table didn't exist there.

I spent a few hours on this and no one else has mentioned to double check your connection string.

You have to include the schema if isnt a public one

SELECT *
FROM <schema>."my_table"

Or you can change your default schema

SHOW search_path;
SET search_path TO my_schema;

Check your table schema here

SELECT *
FROM information_schema.columns

For example if a table is on the default schema public both this will works ok

SELECT * FROM parroquias_region
SELECT * FROM public.parroquias_region

But sectors need specify the schema

SELECT * FROM map_update.sectores_point

You can try:

SELECT * 
FROM public."my_table"

Don't forget double quotes near my_table.

I had to include double quotes with the table name.

db=> \d
                           List of relations
 Schema |                     Name                      | Type  | Owner 
--------+-----------------------------------------------+-------+-------
 public | COMMONDATA_NWCG_AGENCIES                      | table | dan
 ...

db=> \d COMMONDATA_NWCG_AGENCIES
Did not find any relation named "COMMONDATA_NWCG_AGENCIES".

???

Double quotes:

db=> \d "COMMONDATA_NWCG_AGENCIES"
                         Table "public.COMMONDATA_NWCG_AGENCIES"
          Column          |            Type             | Collation | Nullable | Default 
--------------------------+-----------------------------+-----------+----------+---------
 ID                       | integer                     |           | not null | 
 ...

Lots and lots of double quotes:

db=> select ID from COMMONDATA_NWCG_AGENCIES limit 1;
ERROR:  relation "commondata_nwcg_agencies" does not exist
LINE 1: select ID from COMMONDATA_NWCG_AGENCIES limit 1;
                       ^
db=> select ID from "COMMONDATA_NWCG_AGENCIES" limit 1;
ERROR:  column "id" does not exist
LINE 1: select ID from "COMMONDATA_NWCG_AGENCIES" limit 1;
               ^
db=> select "ID" from "COMMONDATA_NWCG_AGENCIES" limit 1;
 ID 
----
  1
(1 row)

This is postgres 11. The CREATE TABLE statements from this dump had double quotes as well:

DROP TABLE IF EXISTS "COMMONDATA_NWCG_AGENCIES";

CREATE TABLE "COMMONDATA_NWCG_AGENCIES" (
...