SQL Server COALESCE() 函數可用於處理 NULL 值。在表達式值評估過程中,NULL 值將替換為 user-given 值。 SQL Server Coalesce 函數按確定的順序計算表達式,並且始終從定義的表達式列表中首先得出非空值。 用法: COALESCE ( exv1, exv2..., exvN ) 在哪裏 -exv1, exv2..., exvN 是表達式值。 SQL...
Using Coalesce with String Concatenation Let’s use the SQL Coalesce function to replace the NULL values with a space character(char(13)). This way, we can get full names despite having NULL values in the data. SELECT First_Name + ' ' +COALESCE(Middle_Name,'')+ ' ' + COALESCE(Last_...
ExamplesA. Running a simple exampleThe following example shows how COALESCE selects the data from the first column that has a nonnull value. This example uses the AdventureWorks2022 database.SQL نسخ SELECT Name, Class, Color, ProductNumber, COALESCE(Class, Color, ProductNumber) AS ...
Examples of SQL COALESCE Here are a few examples to understand SQL COALESCE better. Example #1 SQL query to illustrate the use of simple COALESCE function. Code: SELECT COALESCE(NULL, NULL, NULL, 'EduCBA', NULL, NULL); Output: In this example, we can see that the COALESCE function select...
Works in:SQL Server (starting with 2008), Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse More Examples Example Return the first non-null value in a list: SELECTCOALESCE(NULL,1,2,'W3Schools.com'); Try it Yourself » ...
Learn how to use the SQL COALESCE() function to handle null values, combine columns, and clean up your data with real-world examples and tips. Updated Mar 27, 2025 · 5 min read Contents What Is COALESCE() in SQL? When Should You Use COALESCE()? Syntax of COALESCE() Practical Example...
Transact-SQL reference for COALESCE, which returns the value of the first expression that doesn't evaluate to NULL.
Transact-SQL reference for COALESCE, which returns the value of the first expression that doesn't evaluate to NULL.
In this article, we will show you about SQL Server COALESCE() Function through detailed examples. 1. Introduction SQL is a standard language for storing, manipulating, and retrieving data in a database. SQL stands for Structured Query Language. SQL became a standard of the American National Sta...
COALESCE is one of the tools you have in SQL Server to work with NULL values. It may not be the first one you think of, but it can be a very good choice. In this tip I will provide examples of how you can use COALESCE to peacefully coexist with NULL values. ...