Oracle去重函數distinct

distinct用於返回惟一不一樣的值。spa 表table1：ci id value 1 a 1 a 2 b 3 b 4 c 5 c 表table2:table username password tom s123456 toms 123456   表table3:select username phone tom 10086 jack 10010 做用於單列 select distinct v

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