Oracle数据查询

Oracle、SQL等数据库常用的语言命令有增、删、改、查

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查询相关代码

参考oracle数据库常用的99条查询语句：
1. 从TableName中查找满足Condition1和Condition2的Attr1和Attr2,且Attr2的取值区间[Lower,Upper]并按照Attr3降序排列

select Attr1，Attr2 from TableName where Condition1 and Condition2 and Attr2 between Lower and Upper order by Attr3 desc#升序：order by Attr3 asc或order by Attr3 #降序：order by Attr3 desc

1. in,not in,like,like’_M%’,like’%M%’的用法
   in和not in后是list or set

select * from emp where ename in('SMITH', 'ALLEN', 'KING');#说明：要求查询出姓名是 smith, allen, king 的雇员信息select * from emp where empno not in(7369, 7499, 7521);#说明：要求查询出雇员不是 7369, 7499, 7521 的雇员的具体信息select * from emp where ename like '_M%';#说明：查询出所有雇员姓名中第二个字母包含 "M" 的雇员信息select * from emp where ename like '%M%';#说明：查询出雇员姓名中包含字母 M 的雇员信息