SQL中NVL()函数的用法 - CSDN博客
网页2021年1月25日 · 在 SQL 中，NVL 函数用于判断一个表达式是否为 NULL，并在表达式为 NULL 时返回指定的替代值。它通常用于处理空值或缺失数据的情况。 NVL 函数的语法如下： NVL(expression, substitute_value) 其中，expression ...
Oracle NVL() Function By Practical Examples - Oracle Tutorial
网页The Oracle NVL() function allows you to replace null with a more meaningful alternative in the results of a query. The following shows the syntax of the NVL() function: NVL(e1, e2) Code language: SQL (Structured Query Language) (sql) The NVL() function accepts two arguments. If e1 evaluates to null, then NVL() function returns e2.
NVL - Oracle Help Center
网页NVL lets you replace null (returned as a blank) with a string in the results of a query. If expr1 is null, then NVL returns expr2. If expr1 is not null, then NVL returns expr1. The arguments expr1 and expr2 can have any data type.
sql 语句NVL（）用法 - change_world - 博客园
网页2018年4月10日 · sql 语句NVL（）用法. 如果表达式1为空值，NVL返回值为表达式2的值，否则返回表达式1的值。. 该函数的目的是把一个空值（null）转换成一个实际的值。. 其表达式的值可以是数字型、字符型和日期型。. 但是表达式1和表达式2的数据类型必须为同一个类型 …
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Oracle / PLSQL: NVL Function - TechOnTheNet
网页Description. The Oracle/PLSQL NVL function lets you substitute a value when a null value is encountered. Syntax. The syntax for the NVL function in Oracle/PLSQL is: NVL( string1, replace_with ) Parameters or Arguments. string1. The string to test for a null value. replace_with. The value returned if string1 is null. Returns.
Oracle NVL2 Function By Practical Examples - Oracle Tutorial
网页The Oracle NVL2() function is an extension of the NVL() function with different options based on whether a NULL value exists. The Oracle NVL2() function accepts three arguments. If the first argument is not null, then it returns the second argument.
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SQL NVL() Explained - Database.Guide
网页2022年6月8日 · Some DBMSs provide an NVL() function, which can be used when working with potentially NULL values. The function allows us to replace any NULL values with another value. Syntax. The exact syntax will depend on your DBMS, but it will most likely fall under one of the following: NVL( expr1, expr2 ) With this syntax, if …
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