Mysql Insert data from one table to another table

Question

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

How can I insert data for table2 'middlename' column? In my table1 there is only two column 'firstname' and 'lastname'

Answer 1

Remove the middlename column from the list:

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

If it's a mandatory column (ie NOT NULL and no default defined), you'll have to select a constant. Something like

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

If the column is optional, omit the column from the column list. Like

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