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我想使用建议here的方法将olddb.sqlite3中的表复制到newdb.sqlite3中。为什么UNIQUE约束在这个INSERT上失败?
bash-3.2$ cat cp.sql
ATTACH "olddb.sqlite3" AS old;
INSERT INTO feedback_phone SELECT * FROM old.feedback_phone;
bash-3.2$ rm newdb.sqlite3
bash-3.2$ touch newdb.sqlite3
bash-3.2$ sqlite3 newdb.sqlite3 < cp.sql
Error: near line 3: UNIQUE constraint failed: feedback_phone.id_
这是为什么发生?我知道ID_列由独特的整数:
bash-3.2$ sqlite3 olddb.sqlite3
SQLite version 3.8.5 2014-08-15 22:37:57
Enter ".help" for usage hints.
sqlite> .schema feedback_phone
CREATE TABLE feedback_phone (
id_ INTEGER NOT NULL,
phone VARCHAR,
language VARCHAR,
kind VARCHAR,
user VARCHAR,
timestamp DATETIME,
success BOOLEAN,
url VARCHAR,
PRIMARY KEY (id_),
CHECK (success IN (0, 1))
);
sqlite> select id_ from feedback_phone;
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我复制该表从一个数据库到不同的数据库,完全是空的。究竟是什么违反了约束?