| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
|---|---|---|---|---|---|---|---|---|---|
| 1 | SIMPLE | k | ALL | TABLE_SCHEMA, TABLE_NAME | Using where; Open_full_table; Scanned 0 databases; Using temporary; Using filesort | ||||
| 1 | SIMPLE | c | ALL | CONSTRAINT_SCHEMA | Using where; Open_full_table; Scanned 1 database; Using join buffer (flat, BNL join) |