create table mysql.db
(
    Host                  char(255) charset ascii         default ''  not null,
    Db                    char(64)                        default ''  not null,
    User                  char(32)                        default ''  not null,
    Select_priv           enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Insert_priv           enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Update_priv           enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Delete_priv           enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Create_priv           enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Drop_priv             enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Grant_priv            enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    References_priv       enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Index_priv            enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Alter_priv            enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Create_tmp_table_priv enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Lock_tables_priv      enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Create_view_priv      enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Show_view_priv        enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Create_routine_priv   enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Alter_routine_priv    enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Execute_priv          enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Event_priv            enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    Trigger_priv          enum ('N', 'Y') charset utf8mb3 default 'N' not null,
    primary key (Host, User, Db)
)
    comment 'Database privileges' collate = utf8mb3_bin
                                  row_format = DYNAMIC
                                  stats_persistent = 0;

create index User
    on mysql.db (User);