New in version 11.4

TCA table column fields that define ['config']['MM'] can omit the specification of the intermediate MM table layout in ext_tables.sql. The TYPO3 database analyzer takes care of proper schema definition.

Extensions are strongly encouraged to drop CREATE TABLE definitions from the ext_tables.sql file for those intermediate tables referenced by TCA table columns. Dropping these definitions allows the Core to adapt and migrate definitions if needed.

string (table name)

This value contains the name of the table in which to store a MM relation. It is used together with foreign_table.

The database field with a MM property only stores the number of records in the relation.

Please have a look into the additional information in the MM common property description and the property MM of select field