postgreSQL 基本语法记录

# 创建新表

CREATE TABLE user_tbl(name VARCHAR(20), signup_date DATE);

# 插入数据

INSERT INTO user_tbl(name, signup_date) VALUES('张三', '2013-12-22');

# 选择记录

SELECT * FROM user_tbl;

# 更新数据

UPDATE user_tbl set name = '李四' WHERE name = '张三';

# 删除记录

DELETE FROM user_tbl WHERE name = '李四' ;

# 添加栏位

ALTER TABLE user_tbl ADD COLUMN email VARCHAR(40);

# 将字段改为非空

ALTER TABLE user_tbl ALTER COLUMN signup_date SET NOT NULL;

# 更改字段类型及长度

ALTER TABLE user_tbl ALTER COLUMN signup_date type varchar(20);

# 更名栏位

ALTER TABLE user_tbl RENAME COLUMN signup_date TO signup;

# 删除栏位

ALTER TABLE user_tbl DROP COLUMN email;

# 删除约束

alter table FIN_FIA_INVOICE_INFO drop CONSTRAINT FIN_FIA_INVOICE_INFO_uk ;

# 添加约束

alter table FIN_FIA_INVOICE_INFO add CONSTRAINT FIN_FIA_INVOICE_INFO_uk UNIQUE (FAAII_ORDER_ID,FAAII_INVOICE_NO);

# 表格更名

ALTER TABLE user_tbl RENAME TO backup_tbl;

# 删除表格

DROP TABLE IF EXISTS backup_tbl;