在SELECT语句中,若要为查询的列指定别名,则应使用()子句
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在SELECT语句中,如果要求查询结果中不能出现重复的记录,则使用()
Fill in the blanks with the expressions given below. Change the form where necessary. Each expression can be used only once.1. Almost everybody needs someone to 1)_____in times of trouble. That's why we value friendship so much.