摘要：查询索引信息 show index from db.table; select TABLE_SCHEMA,TABLE_NAME,COLUMN_NAME,CARDINALITY from information_schema.STATISTICS isswhere iss.table_name='ta 阅读全文

摘要：https://dev.mysql.com/doc/refman/8.0/en/explain-output.html 8.8.2 EXPLAIN Output Format The EXPLAIN statement provides information about how MySQL exe 阅读全文