What does eq_ref and ref types mean in MySQL explain

What does eq_ref and ref types mean in MySQL explain

mysql database optimization explain

mysql

How to interpret the output of MySQL EXPLAIN?

mysql query-optimization explain

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Mysql Explain Query with type "ALL" when an index is used

mysql sql indexing query-optimization explain

mysql

MySQL EXPLAIN EXTENDED filtered column (obviously it's not a percentage)

mysql explain

mysql

MySQL Explain: what's causing 'Using temporary; Using filesort'

mysql explain filesort

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MySQL. Creating an index for "OR" queries

mysql indexing explain

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Why the rows returns by "explain" is not equal to count()?

mysql count explain

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MySQL command Explain ignore LIMIT?

mysql limit explain

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Mysql: inner join on primary key for 2 IDs gives "Range checked for each record"

mysql sql indexing explain

mysql

What does Using join buffer (Block Nested Loop) mean with EXPLAIN mysql command in the Extra column?

mysql explain

mysql

Extra in EXPLAIN printing - 'Impossible WHERE noticed after reading const tables'

mysql explain

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