如何使用mysql将多个表合并为1

Question

I have a Mysql DB with 4 tables, with same structure and I need to merge all of this tables in a 1 table.

There are 7 fields that are the same in all tables.

Is there any way to merge the tables ?

Thank you very much

Answer 1

If you want just to query all the data from the tables and present them into one set of results you can try the following:

SELECT * FROM table1
UNION
SELECT * FROM table2
UNION
SELECT * FROM table3
UNION
SELECT * FROM table4

If you actually want to transfer all the data from table2, table3, table4 to table1 you can try something like the following:

INSERT INTO table1 (Col1, Col2...col7)
SELECT * FROM table1
UNION
SELECT * FROM table2
UNION
SELECT * FROM table3
UNION
SELECT * FROM table4