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In which of the following situations should correlation names be used?（）A、A table referenced in the FROM clause has no indexed column.B、The table referenced in the FROM clause has more than 200 columns.C、Two or more tables in the FROM clause have identica

题目

In which of the following situations should correlation names be used?（）

  • A、A table referenced in the FROM clause has no indexed column.
  • B、The table referenced in the FROM clause has more than 200 columns.
  • C、Two or more tables in the FROM clause have identical column names.
  • D、The FROM clause contains two or more tables in the SELECT statement.
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