Join tables with same columns

Question

I load data on daily basis from python into a mysql database and a table "temp_table". I want to join this into the "total_table" so that new values get added to the "total_table"

+-----Temp-table-------+
+----------------------+
| id | Price    | Name |
+----+----------+------+
| 3  | 1.000    | C    |
| 4  | 1.500    | D    |
| 5  | 1.200    | E    |
| 6  | 2.000    | F    |


+-----Total-table------+
+----------------------+
| id | Price    | Name |
+----+----------+------+
| 1  | 1.100    | A    |
| 2  | 1.600    | B    |
| 3  | 1.000    | C    |
| 4  | 1.500    | D    |

result after joining

+-----Total-table------+
+----------------------+
| id | Price    | Name |
+----+----------+------+
| 1  | 1.100    | A    |
| 2  | 1.600    | B    |
| 3  | 1.000    | C    |
| 4  | 1.500    | D    |
| 5  | 1.200    | E    |
| 6  | 2.000    | F    |

I have tried LEFT JOIN. Don't get any errors in python but my total-table is not updated

 SELECT * FROM total_table
            LEFT JOIN
            temp_table
            ON total_table.id = temp_table.id

Answer 1

Hey I think you are looking for the UNION operator:

SELECT * FROM total_table
UNION
SELECT * FROM temp_table

Answer 2

INSERT IGNORE INTO total_table
SELECT *
FROM temp_table

The IGNORE option will make it skip the rows in temp_table that duplicate the unique key in total_table .

Answer 3

You can perform an UPSERT of the temp data.
Via an INSERT ON DUPLICATE KEY UPDATE statement.

Note that the target table does require a primary key or unique index for this.

 INSERT INTO total_table (id, Price, Name) SELECT id, Price, Name FROM temp_table tmp ON DUPLICATE KEY UPDATE Price = tmp.Price, Name = tmp.Name;

 select * from total_table order by id;

id	Price	Name
1	1.100	A
2	1.600	B
3	1.000	C
4	1.500	D
5	1.200	E
6	2.000	F

db<>fiddle here