PostgreSQL的：一个表的内容追加到另一个表

Question

我想合并两个表PostgreSQL中相同的列。实际上，我已经有一个表正在使用，并希望追加来自另一台服务器的转储内容以合并这些表。这两个表都有相同的列，包括主键...所以当我尝试加载转储时，我得到重复的主键错误。 我试图转储加载到一个单独的表，并插入这个新表的内容到第一个与INSERT/SELECT，但主键字段生成，因为重复的错误，我不能在省略它插入（或获得“非空约束”违规）。

会是什么语法（或溶液）到所述第二表中的第一个的端部的内容（或它的转储）追加，以正确的主键？

总之，有一个例子，我想：

# 
# First table: 
# 
CREATE TABLE t_table1 (
    f_fullcmd text, 
    f_id integer NOT NULL, 
    f_body text 
); 

INSERT INTO t_table1 VALUES ('command1', 1, 'This is my first command'); 
INSERT INTO t_table1 VALUES ('command2', 2, 'This is my second command'); 
INSERT INTO t_table1 VALUES ('command3', 3, 'This is my third command'); 

ALTER TABLE ONLY t_table1 ADD CONSTRAINT pk_1_t_table1 PRIMARY KEY (f_id); 

# 
# Second table to append to t_table1 
# 
CREATE TABLE t_table2 (
    f_fullcmd text, 
    f_id integer NOT NULL, 
    f_body text 
); 

INSERT INTO t_table2 VALUES ('run-1', 1, 'This is my first run'); 
INSERT INTO t_table2 VALUES ('run-2', 2, 'This is my second run'); 
INSERT INTO t_table2 VALUES ('run-3', 3, 'This is my third run'); 

ALTER TABLE ONLY t_table2 ADD CONSTRAINT pk_1_t_table2 PRIMARY KEY (f_id); 

# 
# Resulting table: 
# 
CREATE TABLE t_merge (
    f_fullcmd text, 
    f_id integer NOT NULL, 
    f_body text 
); 

INSERT INTO t_merge VALUES ('command1', 1, 'This is my first command'); 
INSERT INTO t_merge VALUES ('command2', 2, 'This is my second command'); 
INSERT INTO t_merge VALUES ('command3', 3, 'This is my third command'); 
INSERT INTO t_merge VALUES ('run-1', 4, 'This is my first run'); 
INSERT INTO t_merge VALUES ('run-2', 5, 'This is my second run'); 
INSERT INTO t_merge VALUES ('run-3', 6, 'This is my third run'); 

ALTER TABLE ONLY t_merge ADD CONSTRAINT pk_1_t_merge PRIMARY KEY (f_id); 

的输入是t_table1和t_table2的转储，并希望得到t_merge。

Answer 1

OK，所以一些试验和研究后，似乎序列来做到这一点：

-- 
-- First table: 
-- 
CREATE TABLE t_table1 (
    f_fullcmd text, 
    f_id integer NOT NULL, 
    f_body text 
); 

INSERT INTO t_table1 VALUES ('command1', 1, 'This is my first command'); 
INSERT INTO t_table1 VALUES ('command2', 2, 'This is my second command'); 
INSERT INTO t_table1 VALUES ('command3', 3, 'This is my third command'); 

ALTER TABLE ONLY t_table1 ADD CONSTRAINT pk_1_t_table1 PRIMARY KEY (f_id); 

-- 
-- Second table to append to t_table1 
-- 
CREATE TABLE t_table2 (
    f_fullcmd text, 
    f_id integer NOT NULL, 
    f_body text 
); 

INSERT INTO t_table2 VALUES ('run-1', 1, 'This is my first run'); 
INSERT INTO t_table2 VALUES ('run-2', 2, 'This is my second run'); 
INSERT INTO t_table2 VALUES ('run-3', 3, 'This is my third run'); 

ALTER TABLE ONLY t_table2 ADD CONSTRAINT pk_1_t_table2 PRIMARY KEY (f_id); 

-- 
-- Create a temp table: 
-- 
CREATE TABLE t_table3 (
    f_fullcmd text, 
    f_id serial NOT NULL, 
    f_body text 
); 

SELECT setval('t_table3_f_id_seq', (SELECT MAX(f_id)+1 FROM t_table1), false); 

-- 
-- Merge table2 into table3 
-- 
INSERT INTO t_table3 (f_fullcmd, f_body) SELECT f_fullcmd, f_body FROM t_table2; 

-- 
-- Merge back into table1: 
-- 
INSERT INTO t_table1 (f_fullcmd, f_id, f_body) SELECT f_fullcmd, f_id, f_body FROM t_table3; 

当创建t_table3，更改主键是一个序列，那么它的初始值设置为最大将第一个表主键的值+1，将t_table2的内容插入到t_table3中（以系列的形式重新生成主键），最后将t_table3的内容导入到t_table1中。

Answer 2

如果两个表是autonumeric不已，而不是创建一个态表是简单的做到这一点：

INSERT INTO t_table1 (f_fullcmd, f_id, f_body) 
SELECT f_fullcmd, 
     f_id + x.t1_max, 
     f_body 
FROM t_table2 
CROSS JOIN (SELECT MAX(f_id) t1_max FROM t_table1) x ;