²  不使用标识符“”时候：

TEST=# create table tb2(create int);

ERROR:  syntax error at or near "create"

LINE 1: create table tb2(create int);

                         ^

TEST=# create table tb3(col int);

CREATE TABLE

TEST=# \d+ tb3;

                         Table "PUBLIC.TB3"

 Column |  Type   | Modifiers | Storage | Stats target | Description

--------+---------+-----------+---------+--------------+-------------

 COL    | INTEGER |           | plain   |              |

²  使用标识符时候：

TEST=# create table "tb4"("col" int);

CREATE TABLE

TEST=# \d+ tb4;

Did not find any relation named "tb4".

TEST=# \d+ "tb4";

                         Table "PUBLIC.tb4"

 Column |  Type   | Modifiers | Storage | Stats target | Description

--------+---------+-----------+---------+--------------+-------------

 col    | INTEGER |           | plain   |              |

TEST=# create table tb5("create" int);

CREATE TABLE

TEST=# \d+ tb5;

                         Table "PUBLIC.TB5"

 Column |  Type   | Modifiers | Storage | Stats target | Description

--------+---------+-----------+---------+--------------+-------------

 create | INTEGER |           | plain   |              |