Linux 環境下Oracle安裝與調試（三）之查詢

#降序/升序查詢 SQL>select * from students order byid(or age)desc(or asc); #查詢字段爲空或者非空 SQL>select * from students where name is (not) null; #過濾重複字段 SQL>select distinct age from students; 使用一些常用函數查詢 #count（*）

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