oracle SQL查询的相关内容

文章 2023-03-24 来自：开发者社区

【大数据开发运维解决方案】Oracle Sql基础查询

1、查找空值null不支持加、减、乘、除、大小比较、相等比较，否则结果只能为空。SQL> select * from dept where 1>=null; DEPTNO DNAME LOC ------ -------------- ------------- SQL> select * from dept where 1<=null; DEPT...

文章 2023-03-16 来自：开发者社区

Oracle给sql查询字段的结果后加上%

oracle数据库如果我想要查询当月销量增长率，并在查询结果后加上百分号该怎么做呢？像这样：方法：sql字段：select (round((当月销量-上月销量)/上月销量* 100,2)) ||'%' from 表名;

文章 2023-01-11 来自：开发者社区

oracle中使用sql查询时字段为空赋值默认值 ( 通过 nvl( )函数 )

函数声明：nvl(col,val)说明：当col为空时取val作为返回值，当col不为空时取col值。作用：最主要是数据格式化，如计算金额，不想出现空数据(计算过程两个参数有一个为空null,都会丢失结果集~返回空)。null值+,-,*,/数字等于null，导致结果集丢失返回空，所以在表达式中对可能为空的值要使用用nvl解决空值问题。。反例: 两个字段( &...

问答 2022-07-07 来自：开发者社区

按照CDC文档提供的oracle案例，我对products表进行插入数据后，sql client查询

按照CDC文档提供的oracle案例，我对products表进行插入数据后，sql client查询该表发现数据没有刷新进去，这是什么问题？oracle用的案例中的镜像。

问答 2022-07-05 来自：开发者社区

大佬们，我使用oracle cdc进行数据同步，oracle源端有数据，但是sql cli中查询源表

大佬们，我使用oracle cdc进行数据同步，oracle源端有数据，但是sql cli中查询源表没有任何数据诶。这是什么情况，oracle版本是阿里云镜像容器oracle10

文章 2022-02-18 来自：开发者社区

Oracle总结【SQL细节、多表查询、分组查询、分页】下

举例子：下面这段代码是错误的！！！select max(avg(sal)) "部门平均工资的最大值",deptno "部门编号" from emp group by deptno;为啥是错误的呢？？？分组中我们已经有了deptno字段了，而我们select 后面跟着也就是多行函数和该字段而已，为啥就错了呢？？？？？我们如果在分组查询的时候，使用了多行函数嵌套的话，那么我们sele...

文章 2022-02-18 来自：开发者社区

Oracle总结【SQL细节、多表查询、分组查询、分页】上

实例与数据库概念Oracle数据库服务器由两部分组成：实例：理解为对象,看不见的数据库：理解为类，看得见的我们在安装Oracle的时候，已经填写过自己数据库的名称了，一般实例与数据库的名称是一致的… &a...

文章 2022-02-17 来自：开发者社区

oracle中sql查询上月、本月、上周、本周、昨天、今天的数据！

NEXT_DAY(x,y):next_day，next_day(x,y)用于计算x时间后第一个星期y的时间。x 是一个时间，y 是星期一至星期日中的一个。也可能用数字1 - 7代替，但是用数字的时候1是代表的周日2才是代表的周一查询今天数据：SELECT COUNT(1) FROM T_TJ_TEST WHERE TO_CHAR(T_RKSJ,'YYYY-MM-DD')=TO_CHAR(SYS.....

问答 2022-02-15 来自：开发者社区

Oracle 中使用同义词SQL查询时，报ORA-22992错误，如何解决？

Oracle 中使用同义词SQL查询时，报ORA-22992错误：

问答 2022-02-15 来自：开发者社区

hibernate中oracle使用原生sql查询left join ：配置报错

sb.append(" left join T_HOUSE_SITE_AUDITO t2 on m.F_APPLY_ID = t2.F_APPLY_ID"); 增加上面的语句后就报错： 2015-2-2 18:32:34 org.hibernate.type.NullableType nullSafeGet 信息: could not read column value from result ....

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