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This implies constraints on the columns that can appear in the associated SELECT clause. As a general rule, the SELECT clause may only contain columns with a unique value per group. This includes columns that appear in the GROUP BY clause as well as aggregates resulting in one value per group.
The columns at the perimeter of the foundations are supported on spread footings measuring as much as 14 by 14 feet (4.3 by 4.3 m) across and 9 feet (2.7 m) thick. The perimeter walls themselves are up to 53 feet (16 m) tall and are composed of concrete with a strength of 10,000 pounds per square inch (69,000 kPa). [ 28 ]
In 2024, for the first time in more than 50 years, there will be no pandas in the United States, after zoos in Atlanta and Washington, D.C., return pandas that have been on loan from Beijing.