A SELECT statement can be used to perform these three functions: 1. Choose rows from a table. 2. Choose columns from a table 3. Bring together data that is stored in different tables by creating a link between them. Which set of keywords describes these capabilities?()A、difference, projection, joinB、selection, projection, joinC、selection, intersection, joinD、intersection, projection, joinE、difference, projection, product

A SELECT statement can be used to perform these three functions: 1. Choose rows from a table. 2. Choose columns from a table 3. Bring together data that is stored in different tables by creating a link between them. Which set of keywords describes these capabilities?()

  • A、difference, projection, join
  • B、selection, projection, join
  • C、selection, intersection, join
  • D、intersection, projection, join
  • E、difference, projection, product

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多选题Which two statements are true regarding subqueries? ()AA subquery can retrieve zero or more rowsBOnly two subqueries can be placed atone levelCA subquery can be used only in SQL query statementsDA subquery can appear on either side of a comparison operatorEThere is no limit on the number of subquery levels in the WHERE clause of a SELECT statement

单选题Which NLS parameter can be used to change the default Oracle sort method from binary to linguistic for the SQL SELECT statement?()A NLS_LANGB NLS_COMPC NLS_SORTD None of the above