What is the name of the coin that creates the most total value in the past 24 hours?
creates the most total value in the past 24 hours refers to max(volume_24h)
SELECT T1.name FROM coins AS T1 INNER JOIN historical AS T2 ON T1.id = T2.coin_id WHERE T2.volume_24h = ( SELECT MAX(volume_24h) FROM historical )
CREATE TABLE coins
(
    id            INTEGER not null
        primary key,
    name          TEXT,
    slug          TEXT,
    symbol        TEXT,
    status        TEXT,
    category      TEXT,
    description   TEXT,
    subreddit     TEXT,
    notice        TEXT,
    tags          TEXT,
    tag_names     TEXT,
    website       TEXT,
    platform_id   INTEGER,
    date_added    TEXT,
    date_launched TEXT
);
CREATE TABLE IF NOT EXISTS "historical"
(
    date               DATE,
    coin_id            INTEGER,
    cmc_rank           INTEGER,
    market_cap         REAL,
    price              REAL,
    open               REAL,
    high               REAL,
    low                REAL,
    close              REAL,
    time_high          TEXT,
    time_low           TEXT,
    volume_24h         REAL,
    percent_change_1h  REAL,
    percent_change_24h REAL,
    percent_change_7d  REAL,
    circulating_supply REAL,
    total_supply       REAL,
    max_supply         REAL,
    num_market_pairs   INTEGER
);
