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I have a simple query that looks like
select id, name from mytable where age=28 order by name
the EXPLAIN output confuses me, I got
possible_keys : age
key : name
Does that mean mysql finally decided to use the index ‘name’ to fetch all the rows? Is the age index used or not? How many indexes are used in this query? If it’s the name index that mysql finnally chooses to use, what happened to the ‘age’ index?
Indeed, name is used and age is not. Best solution is to have a combined key on both age and name (in that order). That way, queries can make use of this index when sorting and filtering on both columns.