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1
by brian
clean slate |
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DROP TABLE IF EXISTS t1, t2;
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2 |
CREATE TABLE t1 (id INTEGER);
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CREATE TABLE t2 (id INTEGER);
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INSERT INTO t1 (id) VALUES (1), (1), (1),(1);
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INSERT INTO t1 (id) SELECT id FROM t1;
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6 |
/* 8 */
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INSERT INTO t1 (id) SELECT id FROM t1;
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8 |
/* 12 */
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INSERT INTO t1 (id) SELECT id FROM t1;
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/* 16 */
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INSERT INTO t1 (id) SELECT id FROM t1;
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12 |
/* 20 */
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13 |
INSERT INTO t1 (id) SELECT id FROM t1;
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/* 24 */
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15 |
INSERT INTO t1 SELECT id+1 FROM t1;
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16 |
INSERT INTO t1 SELECT id+2 FROM t1;
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INSERT INTO t1 SELECT id+4 FROM t1;
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INSERT INTO t1 SELECT id+8 FROM t1;
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INSERT INTO t1 SELECT id+16 FROM t1;
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20 |
INSERT INTO t1 SELECT id+32 FROM t1;
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21 |
INSERT INTO t1 SELECT id+64 FROM t1;
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22 |
INSERT INTO t1 SELECT id+128 FROM t1;
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23 |
INSERT INTO t1 SELECT id+256 FROM t1;
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24 |
INSERT INTO t1 SELECT id+512 FROM t1;
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SELECT AVG(DISTINCT id) FROM t1 GROUP BY id % 13;
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26 |
AVG(DISTINCT id)
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27 |
513.5000
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28 |
508.0000
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29 |
509.0000
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30 |
510.0000
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31 |
511.0000
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32 |
512.0000
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33 |
513.0000
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34 |
514.0000
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35 |
515.0000
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36 |
516.0000
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37 |
517.0000
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38 |
511.5000
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39 |
512.5000
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SELECT SUM(DISTINCT id)/COUNT(DISTINCT id) FROM t1 GROUP BY id % 13;
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SUM(DISTINCT id)/COUNT(DISTINCT id)
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513.5000
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43 |
508.0000
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44 |
509.0000
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45 |
510.0000
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46 |
511.0000
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47 |
512.0000
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48 |
513.0000
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49 |
514.0000
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50 |
515.0000
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51 |
516.0000
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52 |
517.0000
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53 |
511.5000
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54 |
512.5000
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INSERT INTO t1 SELECT id+1024 FROM t1;
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INSERT INTO t1 SELECT id+2048 FROM t1;
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57 |
INSERT INTO t1 SELECT id+4096 FROM t1;
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58 |
INSERT INTO t1 SELECT id+8192 FROM t1;
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INSERT INTO t2 SELECT id FROM t1 ORDER BY id*rand();
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SELECT SUM(DISTINCT id) sm FROM t1;
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61 |
sm
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62 |
134225920
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SELECT SUM(DISTINCT id) sm FROM t2;
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64 |
sm
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65 |
134225920
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SELECT SUM(DISTINCT id) sm FROM t1 group by id % 13;
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67 |
sm
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68 |
10327590
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69 |
10328851
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70 |
10330112
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71 |
10331373
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72 |
10332634
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73 |
10317510
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74 |
10318770
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75 |
10320030
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76 |
10321290
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77 |
10322550
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78 |
10323810
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79 |
10325070
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80 |
10326330
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SET max_heap_table_size=16384;
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SHOW variables LIKE 'max_heap_table_size';
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Variable_name Value
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max_heap_table_size 16384
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85 |
SELECT SUM(DISTINCT id) sm FROM t1;
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86 |
sm
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87 |
134225920
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88 |
SELECT SUM(DISTINCT id) sm FROM t2;
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89 |
sm
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90 |
134225920
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SELECT SUM(DISTINCT id) sm FROM t1 GROUP BY id % 13;
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sm
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93 |
10327590
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94 |
10328851
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95 |
10330112
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96 |
10331373
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97 |
10332634
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98 |
10317510
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99 |
10318770
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100 |
10320030
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101 |
10321290
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102 |
10322550
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103 |
10323810
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104 |
10325070
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105 |
10326330
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106 |
DROP TABLE t1;
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107 |
DROP TABLE t2;
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