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SQL(oracle) select 查询 不包含某个列怎么写、
例如:表 有 A,B,C,D,E,F,G 列 查询时 我想查询结果是 B,C,D,.... 不要A列 怎么查??
select B,C,D,E,F,G FROM 表 ; 怎么能简便写 实现这样的效果呢???
求救各位 大神!!!!!!
SQL不支持去除某一列。你最好指定所需要的列,好处是: 1.减少CPU和网络和内存开销 2.字段变更时提前发现问题,减少程序Bug 3.有机会用到覆盖索引