How MySQL triggers federated indexes

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How to trigger federated index 1. Set up federated index username, password on user table

2. Trigger the federated index

(1) the federated index can be triggered by using all the key of the federated index.

(2) use all the index keys of the federated index, but cannot trigger the federated index if it is connected with or.

(3) when the first field on the left of the federated index is used alone, the federated index can be triggered.

(4) the federated index may not be triggered when other fields of the federated index are used alone.

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