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Editorial Team
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Asked: 2026-05-15T11:57:35+00:00

I have an interesting problem, that i am sure has a simple answer, but

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I have an interesting problem, that i am sure has a simple answer, but i can’t seem to find it in the docs.

I have two separate database tables, on different servers. They are both identical table schema with the same primary keys.

I want to merge the tables together on one server. But, if the row on Server1.Table1 exists in Server2.Table2 then sum up the totals in the columns i specify.

Table1{
column_pk, counter
};
“test1”, 3
“test2”, 4

Table2{
column_pk, counter
};
“test1”, 5
“test2”, 6

So after i merge i want:

“test1”,8
“test2”,10

Basically i need to do a mysqldump but instead of it kicking out raw INSERT statements, i need to do a INSERT..ON DUPLICATE KEY UPDATE statements.

What are my options?

Appreciate any input, thank you

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1 Answer

  1. Editorial Team
    INSERT INTO table_new (column_pk, counter) VALUES ('test',4)
  ON DUPLICATE KEY UPDATE c=c+4;

    Where 4 and test are replaced by your actual data.

    As for how you can achieve an export file containing those queries, I’d suggest you use regular expressions to modify a standard export. Or insert both of them in the same table and the sum them up like suggested by Anax

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