mysqlindexingbinary-treeb-tree
What does "seq_in_index" in MySQL database indexing means?
When an index is created, there is one column I have doubts about, in concern with the physical linking of the data nodes.
When 2 "seq_in_index" are same, how are they placed in the node? How is the structure of the index binary tree in that case?
Solution
It is the position of the column in the index.
Example:
INDEX some_idx(column_a, column_b)
seq_in_index for column_a is 1 and for column_b is 2
In your case the compound index is
INDEX email(email, status)
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