MySQL查询重复及冗余索引sql

-- MySQL 查询重复及冗余索引  information_schema
SELECT
	a.TABLE_SCHEMA AS '数据名',
	a.TABLE_NAME AS '表名',
	a.INDEX_NAME AS '索引1',
	b.INDEX_NAME AS '索引2',
	a.COLUMN_NAME AS '重复列名'
FROM
	STATISTICS a
JOIN STATISTICS b ON a.TABLE_SCHEMA = b.TABLE_SCHEMA
AND a.TABLE_NAME = b.TABLE_NAME
AND a.SEQ_IN_INDEX = b.SEQ_IN_INDEX
AND a.COLUMN_NAME = b.COLUMN_NAME
WHERE
	a.SEQ_IN_INDEX = 1
AND a.INDEX_NAME <> b.INDEX_NAME;