如何将MySQL数据库A的表中的行添加到数据库B中的现有表中

Question

I'm using MySQL. I have a "customers" table in database A (located on server).

I want to add them to the customer table in database B (located on localhost) without deleting anything.

I'm very new to SQL commands or MySQL in general so try to be the most explanatory as you can. If you need more information about something I will edit the post and add it.

(I have MySQL workbench)

Thanks.

Answer 1

Just use this on localhost:

mysqldump -u YOUR_DATABASE_USER -p YOUR_DATABASE_PASS -h YOUR_SERVER_IP databaseA customers > customer.sql
mysql -u YOUR_DATABASE_USER -p YOUR_DATABASE_PASS databaseB < customer.sql

PD: If want some explanation just tell me

Answer 2

On server (DB A) :

# Sets our database as default, so we wont have to write `database`.`table` in the consecutive queries.
# Replace *database* with your database name. 
USE *database*;

# Makes a copy of the customers table - named customers_export.
# This copy contains all the fields and rows from the original table (without indexes),
# and if you want, you can add a WHERE clause to filter out some data
CREATE TABLE `customers_export` SELECT * FROM `customers`;

Since you are using mysql_workbench, Do a Data Export (in MANAGEMENT section) by choosing the relevant database and only the customers_export table.

On localhost (DB B) :

Assuming the database name is the same (otherwise you will need to change the database name in the dump file), do a Data Import/Restore by selecting the dump file which we exported in the previous step. This will create the customer_export table.

# Set as default
USE *database*;

# If the data you want to import contains *NO* collisions (same primary or unique values in both tables), the structure and table name is the same
INSERT INTO `customers` SELECT * FROM `customers_export`;

And we are done.
If it does have collisions, or you want to play change the column names, some values and etc - you will need to either modify the select statement or update the customers_export table to suit your needs.

Also, back up the customers table on the second server - in case something goes wrong with the insert.

Finally - drop the customers_export table on both servers.