Whenever i t开发者_运维知识库ry to make a relationship, i only get an empty pop-up and nothing happens... How can i solve this?
I had the same problem.
Fix: add index to the referenced column
Go to the table structure, and click Index once. Then you'll see it listed if you select the table's index in the left-hand menu. I had the refresh the whole page. Then go to designer and add relation. I had to refresh the whole page once more before seeing the lines appear.
Make sure you have InnoDB tables as you can not make relations on MyISAM tables.
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