Фото: Tim Graham / Getty Images
In previous section, we left the planner stuck on a sequential scan despite believing the table has 50 million rows. The missing piece is column-level statistics. Let's pick up where we left off and inject histogram bounds for created_at.
，详情可参考新收录的资料
And then they had a minor breakthrough. The team discovered that a sofa seen in some of the images was only sold regionally, not nationally, and therefore had a more limited customer base.
20% more alcoholic beverages
Фото: Кристина Кормилицына / РИА Новости