Why PostgreSQL does not like UPPERCASE table names?

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put table name into double quotes if you want postgres to preserve case for relation names.

Quoting an identifier also makes it case-sensitive, whereas unquoted
names are always folded to lower case. For example, the identifiers
FOO, foo, and “foo” are considered the same by PostgreSQL, but “Foo”
and “FOO” are different from these three and each other. (The folding
of unquoted names to lower case in PostgreSQL is incompatible with the
SQL standard, which says that unquoted names should be folded to upper
case. Thus, foo should be equivalent to “FOO” not “foo” according to
the standard. If you want to write portable applications you are
advised to always quote a particular name or never quote it.)

from docs (emphasis mine)

example with quoting:

t=# create table "UC_TNAME" (i int);
CREATE TABLE
t=# \dt+ UC

t=# \dt+ "UC_TNAME"
                      List of relations
 Schema |   Name   | Type  |  Owner   |  Size   | Description
--------+----------+-------+----------+---------+-------------
 public | UC_TNAME | table | postgres | 0 bytes |
(1 row)

example without quoting:

t=# create table UC_TNAME (i int);
CREATE TABLE
t=# \dt+ UC_TNAME
                      List of relations
 Schema |   Name   | Type  |  Owner   |  Size   | Description
--------+----------+-------+----------+---------+-------------
 public | uc_tname | table | postgres | 0 bytes |
(1 row)

So if you created table with quotes, you should not skip quotes querying it. But if you skipped quotes creating object, the name was folded to lowercase and so will be with uppercase name in query – this way you “won’t notice” it.

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