The NULLIF() function returns NULL if two expressions are equal, otherwise it returns the first expression.SyntaxNULLIF(expr1, expr2)Parameter ValuesParameterDescription expr1, expr2 Required. The two expressions to be compared Technical DetailsWorks in: SQL Server (starting with 2008), Azure SQL...
l 传入课程编号,返回一个表中该课程的总分 l Create function fun_sumScore l { l @parClassNo as varchar(10) } l Returns real l Begin l Declare @sumScore real l Select @sumScore = sum(score) l From t_score l Where classNo=@parClassNo l Return @sumScore l End l 使用自定义函数: s...
NULLIF is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL. We recommend that you not use time-dependent functions, such as RAND(), within a NULLIF function. This could cause the function to be evaluated twice and to return...
NULLIF is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL.We recommend that you not use time-dependent functions, such as RAND(), within a NULLIF function. This could cause the function to be evaluated twice and to return ...
NULLIF is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL. We recommend that you not use time-dependent functions, such as RAND(), within a NULLIF function. This could cause the function to be evaluated twice and to return...
ExampleGet your own SQL Server Compare two expressions: SELECT NULLIF(25, 25); Try it Yourself » Definition and UsageThe NULLIF() function compares two expressions and returns NULL if they are equal. Otherwise, the first expression is returned....
BuiltInFunctionTableReference BulkInsertBase BulkInsertOption BulkInsertOptionKind BulkInsertStatement BulkOpenRowset CallTarget CaseExpression CastCall CatalogCollation CatalogCollationOption CellsPerObjectSpatialIndexOption CertificateCreateLoginSource CertificateOption CertificateOptionKinds CertificateStatementBase...
BuiltInFunctionTableReference BulkInsertBase BulkInsertOption BulkInsertOptionKind BulkInsertStatement BulkOpenRowset CallTarget CaseExpression CastCall CatalogCollation CatalogCollationOption CellsPerObjectSpatialIndexOption CertificateCreateLoginSource CertificateOption CertificateOptionKinds CertificateStatementBase ChangeRet...
hive Invalid functionNULLIF # 实现 "hive Invalid functionNULLIF" 的步骤 ## 概述 在Hive中,NULLIF函数用于比较两个表达式,若相等则返回NULL,否则返回第一个表达式的值。这篇文章将向你介绍如何使用Hive的NULLIF函数,并给出示例代码和解释。 ##NULLIF函数的使用步骤 以下是实现 "hive Invalid functionNULLIF" 的步...
NULLIF is equivalent to a searched CASE function in which the two expressions are equal and the resulting expression is NULL. We recommend that you not use time-dependent functions, such as RAND(), within a NULLIF function. This could cause the function to be evaluted twice and to return ...