How to insert values ​​into a table with the help of MySQL self-calculated output?

We can insert values ​​into the table through the self-calculated output returned by MySQL. In this case we don't need to use a virtual "dual" table. The syntax can look like this:

INSERT INTO table_name(column1,column2,column3,…) Select value1,value2,value3,…;

Example

In the example below, we use the output of MySQL self-calculation to insert values ​​into the 'testing' table.

mysql> Create table testing(id int, item_name varchar(10));
Query OK, 0 rows affected (0.15 sec)

mysql> Insert into testing (id,item_name)Select 1,'Book';
Query OK, 1 row affected (0.11 sec)
Records: 1 Duplicates: 0 Warnings: 0

mysql> Insert into testing (id,item_name)Select 2,'Pen';
Query OK, 1 row affected (0.11 sec)
Records: 1 Duplicates: 0 Warnings: 0

mysql> select * from testing;

+------+-----------+
| id   | item_name |
+------+-----------+
| 1    | Book      |
| 2    | Pen       |
+------+-----------+

2 rows in set (0.00 sec)

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