The SQL Server ISNULL function returns the replacement value if the first parameterexpressionevaluates to NULL. SQL Server converts the data type of replacement to data type of expression. Let’s explore SQL ISNULL with examples. 如果第一个参数表达式的计算结果为NULL,则SQL Server ISNULL函数将返回...
Works in: SQL Server (starting with 2008), Azure SQL Database, Azure SQL Data Warehouse, Parallel Data WarehouseMore ExamplesExample Return the specified value IF the expression is NULL, otherwise return the expression: SELECT ISNULL('Hello', 'W3Schools.com'); Try it Yourself » ...
Examples The code samples in this article use theAdventureWorks2022orAdventureWorksDW2022sample database, which you can download from theMicrosoft SQL Server Samples and Community Projectshome page. A. Use ISNULL with AVG The following example finds the average of the weight of all products. It su...
如需其他範例 (例如示範如何使用指令碼元件的 ODBC 目的地),請參閱< Additional Script Component Examples>。 注意 不像在舊版中可以指出是否已經預先編譯指令碼,所有指令碼在 SQL Server 2008 Integration Services (SSIS) 與更新版本中都會預先編譯。 指令碼經過先...
In other words, the function body executes even if NULL is passed as an argument. If RETURNS NULL ON NULL INPUT is specified in a CLR function, it indicates that SQL Server can return NULL when any of the arguments it receives is NULL, without actually invoking the body of the function....
However, once data is compressed, query performance improves. For syntax examples, see Examples - Columnstore reorganize. Notă Starting with SQL Server 2019 (15.x), Azure SQL Database, and Azure SQL Managed Instance, the tuple-mover is helped by a background merge task that ...
Applies to: SQL Server A table-valued function is a user-defined function that returns a table. SQL Server extends the functionality of table-valued functions by allowing you to define a table-valued function in any managed language. Data is returned from a table-valued function through an ...
ExamplesThe code samples in this article use the AdventureWorks2022 or AdventureWorksDW2022 sample database, which you can download from the Microsoft SQL Server Samples and Community Projects home page.A. Return data from the first column that has a non-null valueThe following example demonstrates...
CURRENT_USERReturns the name of the current user in the SQL Server database IIFReturns a value if a condition is TRUE, or another value if a condition is FALSE ISNULLReturn a specified value if the expression is NULL, otherwise return the expression ...
ISNULLtakes only two parameters. By contrastCOALESCEtakes a variable number of parameters. Examples The code samples in this article use theAdventureWorks2022orAdventureWorksDW2022sample database, which you can download from theMicrosoft SQL Server Samples and Community Projectshome page. ...