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...
Return the specified value IF the expression is NULL, otherwise return the expression: SELECT ISNULL(NULL, 'W3Schools.com'); Try it Yourself » Definition and UsageThe ISNULL() function returns a specified value if the expression is NULL.If...
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: ...
The NVL2 function is similar to the NVL function. NVL2 allows you to specify a value to check, and then specify a value to use if it is null, as well as a value to use if it is not null. It’s similar to NVL because NVL allows you to check a value and return something else i...
The NULL function can be used to provided alternate value of a column if it contains NULL value. In SQL Server (Transact-SQL), ISNULL() function allows to ...
In MySQL, IFNULL is equivalent to SQL Server’s ISNULL function. Examples of the SQL NULLIF Function Here are some examples of the NULLIF function. Example 1 This example uses NULLIF on two matching number values. SELECTNULLIF(23,23); ...
Examples: Azure Synapse Analytics and Analytics Platform System (PDW) D. Use ISNULL with AVG The following example finds the average of the weight of all products in a sample table. It substitutes the value50for allNULLentries in theWeightcolumn of theProducttable. ...
is_variant_null 函式 is_account_group_member 函式 isdistinct 運算子 isfalse 運算子 isnan 函式 isnotnull 函式 isnull 函式 isnullop 運算子 istrue 運算子 java_method 函式 json_array_length 函式 json_object_keys 函式 json_tuple 函式 ...
ISNULL function in SQL Script for HANA works like this: isnull isnull(arg1) return 1 (= true), if arg1 is set to null and null checking is on during Evaluator run (EVALUATOR_MAY_RETURN_NULL) you can find interesting documentation at: http://trexweb.wdf.sap.corp:1080/wiki/index....
to useISNULLand notCOALESCE.COALESCEis not a deterministic function and so the result of the expression will always be NULLable.ISNULLis different. It is deterministic. Therefore when the second part of theISNULLfunction is a constant or a literal then the resulting value will be NOT NULL. ...