Oracle中模拟SQL中的isnull函数 程序从MS SQL移植到ORACLE,面临大面积的SQL语句修改,其中用的最多的莫非isnull,虽然oracle中有nvl ,nullif, is null等函数,但却没有isnull。自己写一个吧,但是因为类似ISNULL(),NVL()的函数入参和返回值的数据类型都并不确定,要如何定义类型?姑且用varchar2吧:请看下面测试代码...
程序从MS SQL移植到ORACLE,面临大面积的SQL语句修改,其中用的最多的莫非isnull,虽然oracle中有nvl ,nullif, is null等函数,但却没有isnull。自己写一个吧,但是因为类似ISNULL(),NVL()的函数入参和返回值的数据类型都并不 --创建isnull函数 createorreplacefunctionisnull(i_objinvarchar2, i_obj2invarchar2...
程序从MS SQL移植到ORACLE,⾯临⼤⾯积的SQL语句修改,其中⽤的最多的莫⾮isnull,虽然oracle中有nvl ,nullif, is null等函数,但却没有isnull。⾃⼰写⼀个吧,但是因为类似ISNULL(),NVL()的函数⼊参和返回值的数据类型都并不 --创建isnull函数 create or replace function isnull(i_obj in ...
Here are some examples of the Oracle NVL2 function to help explain how to use the NVL2 function in Oracle SQL. I find that examples are the best way for me to learn about code, even with the explanation above. Example 1 This example shows the basic usage of the NVL2 function. SELECTfir...
OracleOracle does not have an ISNULL() function. However, we can use the NVL() function to achieve the same result:SELECT ProductName,UnitPrice*(UnitsInStock+NVL(UnitsOnOrder,0)) FROM ProductsMySQLMySQL does have an ISNULL() function. However, it works a little bit different from ...
The MS AccessIsNull()function returns TRUE (-1) if the expression is a null value, otherwise FALSE (0): SELECTProductName, UnitPrice * (UnitsInStock + IIF(IsNull(UnitsOnOrder),0, UnitsOnOrder)) FROMProducts; Oracle The OracleNVL()function achieves the same result: ...
在Oracle数据库中,带有ISNULL条件的CaseState是一种用于处理空值的条件语句。它可以用于在查询中根据某个字段的值是否为空来执行不同的操作。 具体来说,CaseState语句的语法如下: 代码语言:sql 复制 CASEWHENcolumn_nameISNULLTHENresult1ELSEresult2END
MySQL offers two methods for determining a NULL value and replacing it with another. In SQL Server the function IFNULL is available and in Oracle NVL. However, standard standard SQL shows us that the COALESCE function is standard ANSI SQL and would standardize your SQL code. ...
请注意,ISNULL函数与NVL函数相同,后者是为了与Oracle兼容而提供的。 日期和时间显示转换 某些检查表达式数据类型需要从逻辑模式转换为ODBC模式或显示模式。例如日期和时间数据类型。如果替换表达式值不是相同的数据类型,则不能在ODBC模式或显示模式下转换此值,并生成SQLCODE错误:日期数据类型为-146;时间数据类型为-147。
Re: ISNULL functionPosted by: Joe Aponte Date: March 24, 2008 08:10AM Hi William, thanks for your help... but, my i assign this query result into a variable, how can i do?, zero rows?. Let me explain, if valor = 0, i am going to do a block of sentence.. but i don'...