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Estimating the cost of a plan

Table statistics

The statistics for a column are maintained by a histogram, which has a count for the values in each bucket

Example: Employee.age column


age range count
18-22 37
23-27 59
28-32 73
33-37 84
38-42 69
43-47 87
48-52 101
53-57 97
58-62 64
63-67 32
68-72 7

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