Examined
This would be the number of rows that were examined by the query analyzer to get the result.
Ref: https://dev.mysql.com/doc/refman/8.0/en/explain-output.html
Sent
This is the number of rows presented in the result set of processing the SQL statement.
Ref: https://dev.mysql.com/doc/refman/8.0/en/mysql-num-rows.html
Affected
The number of rows changed, deleted, or inserted by the statement if it was an update, delete, or insert.
Ref: https://dev.mysql.com/doc/refman/8.0/en/mysql-affected-rows.html
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