安装

brew install postgresql

启动

postgres -D /usr/local/var/postgres

新建用户 -s表示超管

/usr/local/Cellar/postgresql/9.5.3/bin/createuser -s root

创建数据库

/usr/local/Cellar/postgresql/9.5.3/bin/createdb root

客户端登录

psql -U root

创建表

CREATE TABLE COMPANY( ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, AGE INT NOT NULL, ADDRESS CHAR(50), SALARY REAL, JOIN_DATE DATE);

CREATE TABLE DEPARTMENT( ID INT PRIMARY KEY NOT NULL, DEPT CHAR(50) NOT NULL, EMP_ID INT NOT NULL);

查看所有表

\d

查看某表结构

\d company

删除表

drop table company;

创建模式 其实就是表的分组

create schema myschema;

在模式中创建表

create table myschema.company( ID INT NOT NULL, NAME VARCHAR (20) NOT NULL, AGE INT NOT NULL, ADDRESS CHAR (25) , SALARY DECIMAL (18, 2), PRIMARY KEY (ID) );

删除模式

DROP SCHEMA my schema;

强制删除模板

DROP SCHEMA myschema CASCADE;

新增记录

INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY,JOIN_DATE) VALUES (1, ‘Paul’, 32, ‘California’, 20000.00 ,’2001-07-13′);

INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,JOIN_DATE) VALUES (2, ‘Allen’, 25, ‘Texas’
,’
2007-12-13′);

INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY,JOIN_DATE) VALUES (3, ‘Teddy’, 23, ‘Norway’, 20000.00, DEFAULT );
INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY,JOIN_DATE) VALUES (4, ‘Mark’, 25, ‘Rich-Mond’, 65000.00, ‘2007-12-13’ ), (5, ‘David’, 27, ‘Texas’, 85000.00 , ‘2007-12-13’);

查询

select * from company;
select id,name,age from company;
SELECT * FROM COMPANY WHERE SALARY = 20000;
SELECT COUNT(*) AS “RECORDS” FROM COMPANY;
SELECT * FROM COMPANY LIMIT 2 offset 1;
SELECT * FROM COMPANY LIMIT 2;
SELECT * FROM COMPANY WHERE address::text like ‘T%’;

注意非string字段

SELECT * FROM COMPANY WHERE AGE::text LIKE ‘2%’;

下划线表示一个字符

SELECT * FROM COMPANY WHERE AGE::text LIKE ‘2_’;

修改

UPDATE COMPANY SET SALARY = 15000 WHERE ID =
6
;

删除

DELETE FROM COMPANY WHERE ID = 2;