Multi level unique is very important feature in mysql. This feature is present all databases. Using this composite unique key we can achieve multilevel uniqueness.
Here I am going to give you how to create the composite unique key in mysql.
mysql> alter table `user` add unique `DATE_uuid` (`date`, `uuid`)
how to check indexes on table
mysql> show index from user;
+—————-+————+————+————–+————-+———–+————-+———-+——–+——+————+———+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+—————-+————+————+————–+————-+———–+————-+———-+——–+——+————+———+
| user | 0 | PRIMARY | 1 | user_id | A | 0 | NULL | NULL | | BTREE | |
| user | 0 | DATE_uuid | 1 | date | A | NULL | NULL | NULL | | BTREE | |
| user | 0 | DATE_uuid | 2 | uuid | A | 0 | NULL | NULL | | BTREE | |
+—————-+————+————+————–+————-+———–+————-+———-+——–+——+————+———+
3 rows in set (0.01 sec)
mysql>
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