How to alter same table in multiple databases in MySQL

Question

I have a set of database schemas, with each one having the same set of tables.

I want to alter a table by adding a column in each one of the schemas with a single command, instead of doing it for every schema separateley.

Is that possible?

Answer 1

This isn't quite identical to Querying multiple databases at once but it's similar. As in the linked question, you could write a procedure:

1. Get the schema names from information_schema.tables
2. Create your query template
3. Loop over the schema names and for each schema sub the schema name in the query template