How To Add Foreign Key In Database Table In Magento 2

The underneath present gives the arrangement on add foreign key in database table in Magento 2.
One can lay out a connection between two tables with the unfamiliar key.

Add unfamiliar key in a section and lay out the connection of that table with another table.

To add unfamiliar key requirement in the data set table can be a perplexing cycle however not any longer with the arrangement here.

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How to make or drop an unfamiliar key and add Record in the table in Magento 2? Section 4: Last part to this series post of information base activity,