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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>5.2. Types</title><link rel="stylesheet" type="text/css" href="/docbook.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="home" href="index.html" title="Netkiller PostgreSQL 手札" /><link rel="up" href="ddl.html" title="第 5 章 数据定义（DDL）" /><link rel="prev" href="ddl.html" title="第 5 章 数据定义（DDL）" /><link rel="next" href="table.html" title="5.3. 表" /></head><body><a xmlns="" href="//www.netkiller.cn/">Home</a> |
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<a xmlns="" href="//www.netkiller.cn/home/about.html">About</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.2. Types</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ddl.html">上一页</a> </td><th width="60%" align="center">第 5 章 数据定义（DDL）</th><td width="20%" align="right"> <a accesskey="n" href="table.html">下一页</a></td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=watch&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=fork&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&type=follow&count=true&size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td></tr></table><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="types"></a>5.2. Types</h2></div></div></div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idp31"></a>5.2.1. Enumerated Types</h3></div></div></div>
<pre class="programlisting">
CREATE TYPE gender AS ENUM ('Male', 'Female');
</pre>
<pre class="programlisting">
CREATE TABLE person (
name character varying,
gender gender
);
</pre>
</div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="idp32"></a>5.2.2. uuid</h3></div></div></div>
<pre class="programlisting">
create extension "uuid-ossp";
create table products (
product_id uuid primary key default uuid_generate_v4()
);
</pre>
<pre class="screen">
-bash-4.1$ psql test
psql (9.2.4)
Type "help" for help.
test=# create extension "uuid-ossp";
CREATE EXTENSION
test=# select uuid_generate_v4();
uuid_generate_v4
--------------------------------------
fed01361-b3bd-4844-8a99-34b0d7eab78d
(1 row)
test=# create table products (product_id uuid primary key default uuid_generate_v4());
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "products_pkey" for table "products"
CREATE TABLE
test=#
test=# insert into products values (default), (default);
INSERT 0 2
test=# select * from products;
product_id
--------------------------------------
25bef8e4-35a2-439c-83ed-dd40a61aef92
ea02a9a3-114d-417f-9a65-7292715538da
(2 rows)
test=#
</pre>
</div>
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