Based on the Oracle SQL query shown in the diagram, here is the extracted SQL code and the result set: SQL Query: SELECT STATE, DECODE(STATE, 'HI', 'Remote US state', 'AK', 'Continental US state', 'Contiguous U
Oracle通用函数总结 1.通用函数(NVL、NULLIF、COALESCE) (1)NVL函数能将空值转换成一个已知的值,可以使用数据类型有日期、字符、数字。 (2)NUKKIF只能在相等值的情况下就返回的是null...,expr2);相等的返回null,不相等的返回expr1. 4.使用COALESCE函数解释:如果第一个表达式为空,则返回下一个表达式,对其他的...
问在NVL函数中出现错误，是否存在类似NVL的等效函数？EN如果表达式A为空值，NVL返回值为表达式B的值，...
特点:oracle数据库中,没有数据表示空,如果空参与计算结果为空.oracle数据库中任何类型都可以为空.nvl(exp1,exp2) 作用:如果exp1不为空,返回exp1的结果,如果exp1为空,那么返回exp2的结果. # 查询员工姓名以及员工的月收入(sal+comm) select ename,sal+nvl(comm,0) from emp; -- 为查询的结果定义别 ...
Oracle SQL 函数使用记录 nvl(列名,替换值) NVL(column_name,0) 用来判断字段的值是否为null,如果查询的字段值为null,则将其用其他字符代替,效果如下 listagg(要合并的列名,分隔符) within group(order by 排序列名 ASC/DESC ) LISTAGG(ENAME, ‘,’) WITHIN GROUP (O... ...
ORACLE provides a built-in function namedNVL()that replaces the NULL entries with a default entry/value. When it comes to PostgreSQL, it doesn’t support theNVL()function. However, it offers aCOALESCE()function that can be used as an alternative toNVL()function. ...
The difference is that theisnull()function has been replaced with theNVL()function, an Oracle function in the SQL server. Difference Between theCOALESCE()and theifnull()Functions The main difference between theCOALESCE()andifnull()functions is that theifnull()function takes only two arguments....
Alternatives to ISNULL(), NVL(), IFNULL() or COALESCE() in SQLite, Comparing the Performance of IsNull and Coalesce in the Same Query, Utilizing .isnull() in Conjunction with .iloc, Records with NULL field are not returned when ISNULL is used in the wher