PostgreSQL create table

One 、 Environmental Science

[email protected]:~$ cat /etc/os-release 
PRETTY_NAME="Ubuntu 22.04 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy

[email protected]:~$ /usr/local/pgsql/bin/psql -V
psql (PostgreSQL) 14.2

Two 、 Create table

2.1 grammar

CREATE [ [ GLOBAL | LOCAL ] {
     TEMPORARY | TEMP } | UNLOGGED ] TABLE
[ IF NOT EXISTS ] table_name ( [
{
     column_name data_type [ COMPRESSION compression_method ]
[ COLLATE collation ] [ column_constraint [ ... ] ]
| table_constraint
| LIKE source_table [ like_option ... ] }
[, ... ]
] )
[ INHERITS ( parent_table [, ... ] ) ]
[ PARTITION BY {
     RANGE | LIST | HASH } ( {
     column_name |( expression ) } [ COLLATE collation ] [ opclass ] [, ... ] ) ]
[ USING method ]
[ WITH ( storage_parameter [= value] [, ... ] ) | WITHOUT OIDS ]
[ ON COMMIT {
     PRESERVE ROWS | DELETE ROWS | DROP } ]
[ TABLESPACE tablespace_name ]

CREATE [ [ GLOBAL | LOCAL ] {
     TEMPORARY | TEMP } | UNLOGGED ] TABLE
[ IF NOT EXISTS ] table_name
OF type_name [ ({
     column_name [ WITH OPTIONS ] [ column_constraint [ ... ] ]
| table_constraint }
[, ... ]
) ]
[ PARTITION BY {
     RANGE | LIST | HASH } ( {
     column_name |( expression ) } [ COLLATE collation ] [ opclass ] [, ... ] ) ]
[ USING method ]
[ WITH ( storage_parameter [= value] [, ... ] ) | WITHOUT OIDS ]
[ ON COMMIT {
     PRESERVE ROWS | DELETE ROWS | DROP } ]
[ TABLESPACE tablespace_name ]

CREATE [ [ GLOBAL | LOCAL ] {
     TEMPORARY | TEMP } | UNLOGGED ] TABLE
[ IF NOT EXISTS ] table_name
PARTITION OF parent_table [ (
{
     column_name [ WITH OPTIONS ] [ column_constraint [ ... ] ]
| table_constraint }
[, ... ]
) ] {
     FOR VALUES partition_bound_spec | DEFAULT }
[ PARTITION BY {
     RANGE | LIST | HASH } ( {
     column_name |
( expression ) } [ COLLATE collation ] [ opclass ] [, ... ] ) ]
[ USING method ]
[ WITH ( storage_parameter [= value] [, ... ] ) | WITHOUT OIDS ]
[ ON COMMIT {
     PRESERVE ROWS | DELETE ROWS | DROP } ]
[ TABLESPACE tablespace_name ]

where column_constraint is:

[ CONSTRAINT constraint_name ]
{
     NOT NULL |
NULL |
CHECK ( expression ) [ NO INHERIT ] |
DEFAULT default_expr |
GENERATED ALWAYS AS ( generation_expr ) STORED |
GENERATED {
     ALWAYS | BY DEFAULT } AS IDENTITY
[ ( sequence_options ) ] |
UNIQUE index_parameters |
PRIMARY KEY index_parameters |
REFERENCES reftable [ ( refcolumn ) ] [ MATCH FULL | MATCH
PARTIAL | MATCH SIMPLE ]
[ ON DELETE referential_action ] [ ON UPDATE referential_action
] }
[ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY
IMMEDIATE ]

and table_constraint is:

[ CONSTRAINT constraint_name ]
{
     CHECK ( expression ) [ NO INHERIT ] |
UNIQUE ( column_name [, ... ] ) index_parameters |
PRIMARY KEY ( column_name [, ... ] ) index_parameters |
EXCLUDE [ USING index_method ] ( exclude_element WITH operator
[, ... ] ) index_parameters [ WHERE ( predicate ) ] |
FOREIGN KEY ( column_name [, ... ] ) REFERENCES reftable
[ ( refcolumn [, ... ] ) ]
[ MATCH FULL | MATCH PARTIAL | MATCH SIMPLE ] [ ON
DELETE referential_action ] [ ON UPDATE referential_action ] }
[ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY
IMMEDIATE ]

and like_option is:

{
     INCLUDING | EXCLUDING } {
     COMMENTS | COMPRESSION | CONSTRAINTS |
DEFAULTS | GENERATED | IDENTITY | INDEXES | STATISTICS | STORAGE |
ALL }

and partition_bound_spec is:

IN (partition_bound_expr [, ...] ) |
FROM ( {
     partition_bound_expr | MINVALUE | MAXVALUE } [, ...] )
TO ( {
     partition_bound_expr | MINVALUE | MAXVALUE } [, ...] ) |
WITH ( MODULUS numeric_literal, REMAINDER numeric_literal )

index_parameters in UNIQUE, PRIMARY KEY, and EXCLUDE constraints
are:

[ INCLUDE ( column_name [, ... ] ) ]
[ WITH ( storage_parameter [= value] [, ... ] ) ]
[ USING INDEX TABLESPACE tablespace_name ]

exclude_element in an EXCLUDE constraint is:

{
     column_name | ( expression ) } [ opclass ] [ ASC | DESC ] [ NULLS
{
     FIRST | LAST } ]

2.2 Create table

[email protected]:~$ /usr/local/pgsql/bin/psql mydb
psql (14.2)
Type "help" for help.

mydb=# CREATE TABLE mytable (id int, name char(32), age int);
CREATE TABLE
mydb=# 

2.3 Delete table

[email protected]:~$ /usr/local/pgsql/bin/psql mydb
psql (14.2)
Type "help" for help.

mydb=# DROP TABLE mytable;
DROP TABLE
mydb=# 

1. No, show databases/tables; It's not convenient to check , We haven't found out how to look at the existing libraries yet / surface ,
2. For tablespaces 、schema Waiting to learn