Merging two MySql tables

torbjornzetterlund MySQL Tricks Tags: ,
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How to merge two MySql tables that have the same structure and were the primary keys of the two tables will clash.

One option is:


INSERT IGNORE

INTO table_1

SELECT *

FROM table_2;

 

which allows those rows in table_1 to supersede those in table_2 that have a matching primary key, while still inserting rows with new primary keys.

 

Alternatively,

REPLACEĀ 

INTO table_1

SELECT *

FROM table_2;

 

will update those rows already in table_1 with the corresponding row from table_2, while inserting rows with new primary keys.