SQLITE：使用主键约束合并来自不同数据库的表

Question

我想 concatenate/append 来自 2 个不同数据库（数据库 X 和 Y）的表。

ATTACH "all\tab_X.db" AS db1;
ATTACH "all\tab_Y.db" AS db2;

INSERT INTO db1.PAYMENT SELECT * FROM db2.PAYMENT

但是这给了我这个错误：UNIQUE 约束失败：PAYMENT.ID

如何创建一个将 ID 与数据库名称组合在一起的新列（例如：X_123、Y_123）并将其设为主键？

Table DB X

Pmt_ID	P_CUSTOMER_NAME	P_CASH_AMOUNT
1	ABC ENTERPRISE	1035.18
2	RAS HOLDING	385.19
3	SEMANGAT BHD	622.21

Table DB Y

Pmt_ID	P_CUSTOMER_NAME	P_CASH_AMOUNT
1	ZNZ MINI MARKET	338.14
2	SEMANGAT SDN BHD	298.92
3	TAFFANY MARKETING	253.34

我要的结果

PK	Pmt_ID	P_CUSTOMER_NAME	P_CASH_AMOUNT
X1	1	ABC ENTERPRISE	1035.18
X2	2	RAS HOLDING	385.19
X3	3	SEMANGAT BHD	622.21
Y1	1	ZNZ MINI MARKET	338.14
Y2	2	SEMANGAT SDN BHD	298.92
Y3	3	TAFFANY MARKETING	253.34

Answer 1

先附上3个数据库：

ATTACH "all\tab_X.db" AS db1;
ATTACH "all\tab_Y.db" AS db2;
ATTACH "all\tab_Z.db" AS db3;

新建 table:

CREATE TABLE db3.PAYMENT(Pmt_ID TEXT PRIMARY KEY, P_CUSTOMER_NAME TEXT, P_CASH_AMOUNT REAL);

最后插入行：

INSERT INTO db3.PAYMENT(Pmt_ID, P_CUSTOMER_NAME, P_CASH_AMOUNT) 
SELECT 'X' || Pmt_ID, P_CUSTOMER_NAME, P_CASH_AMOUNT FROM db1.PAYMENT
UNION ALL
SELECT 'Y' || Pmt_ID, P_CUSTOMER_NAME, P_CASH_AMOUNT FROM db2.PAYMENT

SQLITE：使用主键约束合并来自不同数据库的表

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