| 1 | mysql> select count(white_player) from game where white_player like 'trainer@chesspark.com/TrainingBot' or black_player like 'trainer@chesspark.com/TrainingBot';
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| 2 | +---------------------+
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| 3 | | count(white_player) |
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| 4 | +---------------------+
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| 5 | | 11771 |
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| 6 | +---------------------+
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| 7 | 1 row in set (0.89 sec)
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| 8 |
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| 9 | mysql> select count(white_player) from game where lower(white_player) = lower('trainer@chesspark.com/TrainingBot') or lower(black_player) = lower('trainer@chesspark.com/TrainingBot');
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| 10 | +---------------------+
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| 11 | | count(white_player) |
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| 12 | +---------------------+
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| 13 | | 11771 |
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| 14 | +---------------------+
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| 15 | 1 row in set (2.09 sec)
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| 16 |
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| 17 | mysql> create index game_lower_white_player_idx on game (white_player);
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| 18 | Query OK, 301279 rows affected (7.93 sec)
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| 19 | Records: 301279 Duplicates: 0 Warnings: 0
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| 20 |
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| 21 | mysql> create index game_lower_black_player_idx on game (black_player);
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| 22 | Query OK, 301279 rows affected (12.96 sec)
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| 23 | Records: 301279 Duplicates: 0 Warnings: 0
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| 24 |
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| 25 | mysql> select count(white_player) from game where white_player like 'trainer@chesspark.com/TrainingBot' or black_player like 'trainer@chesspark.com/TrainingBot';
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| 26 | +---------------------+
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| 27 | | count(white_player) |
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| 28 | +---------------------+
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| 29 | | 11771 |
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| 30 | +---------------------+
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| 31 | 1 row in set (0.16 sec)
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| 32 |
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| 33 | mysql> select count(white_player) from game where lower(white_player) = lower('trainer@chesspark.com/TrainingBot') or lower(black_player) = lower('trainer@chesspark.com/TrainingBot');
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| 34 | +---------------------+
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| 35 | | count(white_player) |
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| 36 | +---------------------+
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| 37 | | 11771 |
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| 38 | +---------------------+
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| 39 | 1 row in set (1.83 sec)
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| 40 |
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