1 FROM: specifies the tables that you want to query data from. 2  You can also use the FROM clause to join multiple tables. 3  WHERE: filters unwanted records or rows in the result. 4  GROUP BY: groups rows by common column values. 5  HAVING: uses with the GROUP BY clause to filter unwanted groups.
Natural Bridge (Virginia) For the nearby unincorporated community of the same name, see Natural Bridge, Virginia. Natural Bridge is a geological formation in Rockbridge County, Virginia, comprising a 215-foot-high (66 m) natural arch with a span of 90 feet (27 m). It is situated within a gorge carved from the surrounding mountainous limestone terrain by Cedar Creek, a small tributary of the James River.
The Hoover Dam and the bypass bridge (HDBPB) are world renown for their architectural beauty and engineering excellence. The top of the dam is located in a deep gorge and is 720 feet above the Colorado River. The bridge, is located 1500 feet downstream from the dam and is 200 feet higher.