sql1111

[kappybar]

Count: 125296  Time=0.00s (136s)  Lock=0.00s (0s)  Rows=1.0 (125296), isucon[isucon]@localhost
  SELECT IFNULL(SUM(l2.tip), N) FROM livestreams l INNER JOIN livecomments l2 ON l.id = l2.livestream_id WHERE l.id = N

Count: 4041  Time=0.03s (130s)  Lock=0.00s (0s)  Rows=4.1 (16512), isucon[isucon]@localhost
  SELECT * FROM livestream_tags WHERE livestream_id = N

Count: 125298  Time=0.00s (114s)  Lock=0.00s (0s)  Rows=1.0 (125298), isucon[isucon]@localhost
  SELECT COUNT(*) FROM livestreams l INNER JOIN reactions r ON l.id = r.livestream_id WHERE l.id = N

Count: 676925  Time=0.00s (92s)  Lock=0.00s (0s)  Rows=0.5 (319061), 2users@localhost
  #

Count: 8220  Time=0.01s (51s)  Lock=0.00s (0s)  Rows=0.8 (6885), isucon[isucon]@localhost
  SELECT image FROM icons WHERE user_id = N

Count: 3230  Time=0.01s (31s)  Lock=0.00s (0s)  Rows=1.0 (3230), isucon[isucon]@localhost
  SELECT IFNULL(SUM(l2.tip), N) FROM users u
  INNER JOIN livestreams l ON l.user_id = u.id  
  INNER JOIN livecomments l2 ON l2.livestream_id = l.id
  WHERE u.id = N

Count: 3232  Time=0.01s (30s)  Lock=0.00s (0s)  Rows=1.0 (3232), isucon[isucon]@localhost
  SELECT COUNT(*) FROM users u
  INNER JOIN livestreams l ON l.user_id = u.id
  INNER JOIN reactions r ON r.livestream_id = l.id
  WHERE u.id = N

Count: 29058  Time=0.00s (16s)  Lock=0.00s (0s)  Rows=0.0 (0), isucon[isucon]@localhost
  DELETE FROM livecomments
  WHERE
  id = N AND
  livestream_id = N AND
  (SELECT COUNT(*)
  FROM
  (SELECT 'S' AS text) AS texts
  INNER JOIN
  (SELECT CONCAT('S', 'S', 'S') AS pattern) AS patterns
  ON texts.text LIKE patterns.pattern) >= N

Count: 611  Time=0.03s (15s)  Lock=0.00s (0s)  Rows=1.0 (611), isucon[isucon]@localhost
  SELECT slot FROM reservation_slots WHERE start_at = N AND end_at = N

Count: 6608  Time=0.00s (15s)  Lock=0.00s (0s)  Rows=1.0 (6608), isucon[isucon]@localhost
  SELECT * FROM themes WHERE user_id = N

Count: 185  Time=0.06s (10s)  Lock=0.00s (0s)  Rows=0.3 (62), isucon[isucon]@localhost
  SELECT id, user_id, livestream_id, word FROM ng_words WHERE user_id = N AND livestream_id = N

Count: 1540  Time=0.00s (7s)  Lock=0.00s (0s)  Rows=0.0 (0), isucon[isucon]@localhost
  COMMIT

Count: 16501  Time=0.00s (6s)  Lock=0.00s (0s)  Rows=1.0 (16501), isucon[isucon]@localhost
  SELECT * FROM tags WHERE id = N

Count: 55  Time=0.08s (4s)  Lock=0.00s (0s)  Rows=0.0 (0), isucon[isucon]@localhost
  UPDATE reservation_slots SET slot = slot - N WHERE start_at >= N AND end_at <= N

Count: 1000  Time=0.00s (4s)  Lock=0.00s (0s)  Rows=0.0 (0), isucon[isucon]@localhost
  INSERT INTO users (id, name, display_name, description, password) VALUES (N, 'S', 'S', 'S', 'S')

Count: 55  Time=0.07s (3s)  Lock=0.00s (0s)  Rows=11.1 (611), isucon[isucon]@localhost
  SELECT * FROM reservation_slots WHERE start_at >= N AND end_at <= N FOR UPDATE

Count: 191  Time=0.02s (3s)  Lock=0.00s (0s)  Rows=0.0 (0), isudns[isudns]@localhost
  delete from records where domain_id=N and name='S' and type='S'

Count: 6434  Time=0.00s (2s)  Lock=0.00s (0s)  Rows=1.0 (6434), isucon[isucon]@localhost
  SELECT * FROM users WHERE id = N

Count: 50  Time=0.05s (2s)  Lock=0.00s (0s)  Rows=1.0 (48), isucon[isucon]@localhost
  SELECT * FROM livestreams WHERE user_id = N

Count: 177  Time=0.01s (2s)  Lock=0.00s (0s)  Rows=0.0 (0), isucon[isucon]@localhost
  INSERT INTO icons (user_id, image) VALUES (N, 'S')

Count: 510  Time=0.00s (2s)  Lock=0.00s (0s)  Rows=0.0 (0), isucon[isucon]@localhost
  INSERT INTO themes (user_id, dark_mode) VALUES (N, true)

Count: 490  Time=0.00s (1s)  Lock=0.00s (0s)  Rows=0.0 (0), isucon[isucon]@localhost
  INSERT INTO themes (user_id, dark_mode) VALUES (N, false)

Count: 382  Time=0.00s (1s)  Lock=0.00s (0s)  Rows=0.5 (191), isudns[isudns]@localhost
  SELECT content,ttl,prio,type,domain_id,disabled,name,auth FROM records WHERE disabled=N and type='S' and name='S' and domain_id=N

Count: 192  Time=0.01s (1s)  Lock=0.00s (0s)  Rows=0.0 (0), isudns[isudns]@localhost
  commit

Count: 3138  Time=0.00s (1s)  Lock=0.00s (0s)  Rows=1.0 (3138), isucon[isucon]@localhost
  SELECT * FROM livestreams WHERE id = N

Count: 19  Time=0.06s (1s)  Lock=0.00s (0s)  Rows=0.2 (3), isucon[isucon]@localhost
  SELECT * FROM ng_words WHERE user_id = N AND livestream_id = N ORDER BY created_at DESC

Count: 19  Time=0.06s (1s)  Lock=0.00s (0s)  Rows=1.7 (32), isucon[isucon]@localhost
  SELECT * FROM ng_words WHERE livestream_id = N

Count: 191  Time=0.01s (0s)  Lock=0.00s (0s)  Rows=0.0 (0), isudns[isudns]@localhost
  SELECT content,ttl,prio,type,domain_id,disabled,name,auth FROM records WHERE disabled=N and name='S' and domain_id=N

Count: 177  Time=0.01s (0s)  Lock=0.00s (0s)  Rows=0.0 (0), isucon[isucon]@localhost

[kappybar]

IFNULL(SUM(l2.tip), N) SUM(l2.tip) が null なら N, そうでないならSUM(l2.tip)をかえす。

[kappybar]

sum()は一件でもnull が入っているなら答えが null になる。