PostgreSQL中使用枚舉類型

https://wiki.postgresql.org/wiki/Enum

建立enum:

pgsql=# CREATE TYPE mood AS ENUM ('sad', 'ok', 'happy');
CREATE TYPE
pgsql=# 

建表：

pgsql=# CREATE TABLE person (
pgsql(#    name text,
pgsql(#    current_mood mood
pgsql(# );
CREATE TABLE
pgsql=# 

數據輸入：

pgsql=# INSERT INTO person VALUES ('Larry', 'sad');
INSERT 0 1
pgsql=# INSERT INTO person VALUES ('Curly', 'ok');
INSERT 0 1
pgsql=# S

查詢:

pgsql=# SELECT * FROM person WHERE current_mood > 'sad';
 name  | current_mood 
-------+--------------
 Curly | ok
(1 row)

pgsql=#