你可能感興趣的試題

Which of the following statements eliminates all but one of each set of duplicate rows in the DEPT column in the STAFF table?（）

A.SELECT UNIQUE dept FROM staff
B.SELECT DISTINCT dept FROM staff
C.SELECT (dept) UNIQUE FROM staff
D.SELECT (dept) DISTINCT FROM staff

單項(xiàng)選擇題

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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你可能感興趣的試題

Which of the following statements eliminates all but one of each set of duplicate rows in the DEPT column in the STAFF table?（）

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

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