我有两张桌子 第一:
---------------------
ID Statement
---------------------
1 First statement
2 Another one
第二:
---------------------
ID Topic
---------------------
1 First topic
2 Another topic
到目前为止,所有主题的陈述都是不变的。对于每个主题,都显示了所有陈述
现在我希望语句是动态的,并且每个主题都不同,所以我需要Statement
表看起来像:
-------------------------------
ID Statement TopicID
-------------------------------
1 First statement 1
2 Another one 1
3 First statement 2
4 Another one 2
怎么能实现呢?
编辑
到目前为止,我能够像这样创建表格:
-------------------------------
ID Statement TopicID
-------------------------------
3 First statement 1
4 Another one 1
5 First statement 2
6 Another one 2
为此,我在ALTER TABLE Statements ADD COLUMN TopicID int(10) UNSIGNED
的语句中添加了新列
所以我的桌子看起来像这样:
-------------------------------
ID Statement TopicID
-------------------------------
1 First statement 0
2 Another one 0
下一步是使用INSERT INTO statements (Statement, TopicId) SELECT statements.Statement, topics.ID FROM statements, topics
查询填充表格。这种Statements
表填充了Statement
和TopicID
数据:
-------------------------------
ID Statement TopicID
-------------------------------
1 First statement 0
2 Another one 0
3 First statement 1
4 Another one 1
5 First statement 2
6 Another one 2
最后一步是删除带有statement
TopicID
的{{1}}个DELETE FROM Statements WHERE TopicID = 0
有没有更简单的方法?