• 1. SELECT - Query Statements: 数据查询语言

• 1.The most important element of the SQL query is the Select statement. The rules for Select statements are as follows.
  SQL查询最重要的元素是查询语句。
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• 2.Describes how to create a query that merges the results of two or more SELECT statements into one result set.
  描述如何创建将两个或更多的select语句的结果合并到一个结果集的查询。
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