Question

I would like merge 2 MySQL tables without adding the same lines.
I have 2 tables with the sames columns but not the same row, such as.

table_1
+-------+--------+------+
| Name  | ResNum | Code | 
+-------+--------+------+
| User1 | 25BAM8 | PAR1 |
| User2 | E26J09 | COP3 |
+-------+--------+------+

table_2
+-------+--------+------+
| Name  | ResNum | Code | 
+-------+--------+------+
| User1 | 25BAM8 | PAR1 |
| User3 | 34VNS2 | PAR1 |
| User4 | EZQVG5 | COP3 |
+-------+--------+------+

I want when merging table_2 to table_1, got this:

table_1
+-------+--------+------+
| Name  | ResNum | Code | 
+-------+--------+------+
| User1 | 25BAM8 | PAR1 |
| User2 | E26J09 | COP3 |
| User3 | 34VNS2 | PAR1 |
| User4 | EZQVG5 | COP3 |
+-------+--------+------+

I have already tried with INSERT IGNORE INTO and REPLACE INTO command but it copy the existing rows, like that:

table_1
+-------+--------+------+
| Name  | ResNum | Code | 
+-------+--------+------+
| User1 | 25BAM8 | PAR1 |
| User1 | 25BAM8 | PAR1 |
| User2 | E26J09 | COP3 |
| User3 | 34VNS2 | PAR1 |
| User4 | EZQVG5 | COP3 |
+-------+--------+------+

Any help would be appreciated.

Answer 1

An easy solution would be to put a temporary UNIQUE index on Name on table_1:

CREATE UNIQUE INDEX unique_name ON table_1(Name)

To transfer the actual rows, use a SELECT INSERT:

INSERT INTO table_1(Name, ResNum, Code) SELECT Name, ResNum, Code FROM table_2.

Then drop the UNIQUE index:

DROP INDEX unique_name ON table_1