Mysql将数据从一个表插入到另一个表

Question

INSERT INTO table2 (firstname, lastname, middlename) SELECT firstname, lastname FROM table1 WHERE id = 1

如何为table2“中间名”列插入数据？ 在我的表1中，只有两列“名字”和“姓氏”

Answer 1

从列表中删除middlename列：

INSERT INTO table2 (firstname,lastname) 
SELECT firstname, lastname FROM table1 WHERE id = 1

Answer 2

试试这个查询

INSERT INTO table2 (firstname, lastname, middlename) SELECT firstname, lastname, "NA" FROM table1 WHERE id = 1

Answer 3

INSERT INTO table2 (firstname,lastname) SELECT firstname, lastname FROM table1

将table2中的中间名留空，因为您没有记录

Answer 4

如果这是必填列（即NOT NULL且未定义默认值），则必须选择一个常量。 就像是

insert into table2 (firstname, lastname, middlename)
select firstname, lastname, 'N/A' from table1 where id = 1;

如果列是可选的，请从列列表中省略该列。 喜欢

insert into table2 (firstname, lastname)
select firstname, lastname from table1 where id = 1;