Updating data with UPDATE

UPDATE episodes
SET title="test Episode 2"
WHERE
    series_id = 2
    AND season_id = 5
    AND episode_id = 12
;

COMMIT;

-- View result:
SELECT * FROM episodes WHERE series_id = 2 AND season_id = 5;

-- YDB doesn't see changes that take place at the start of the transaction,
-- which is why it first performs a read. You can't UPDATE or DELETE a table
-- already changed within the current transaction. UPDATE ON and
-- DELETE ON let you read, update, and delete multiple rows from one table
-- within a single transaction.

$to_update = (
    SELECT series_id,
           season_id,
           episode_id,
           Utf8("Yesterday's Jam UPDATED") AS title
    FROM episodes
    WHERE series_id = 1 AND season_id = 1 AND episode_id = 1
);

SELECT * FROM episodes WHERE series_id = 1 AND season_id = 1;

UPDATE episodes ON
SELECT * FROM $to_update;

COMMIT;

-- View result:
SELECT * FROM episodes WHERE series_id = 1 AND season_id = 1;

COMMIT;