下面,如果 “UnitsOnOrder” 是 NULL,则不会影响计算,因为如果值是 NULL 则 ISNULL() return 0: SQL Server / MS Access AI检测代码解析 SELECT ProductName,UnitPrice*(UnitsInStock+ISNULL(UnitsOnOrder,0)) FROM Products 1. 2. 3. Oracle Oracle 没有 ISNULL() 函数。不过,咱们可以使用 NVL() 函数...
l GOTO l WIATFOR 用于暂停执行SQL语句 l WIATFOR DELAY ‘0.0.10’ 暂停指定10秒 l Return语句,和break类型,但return语句可以返回一个整型值 l创建视图 l 可以在企业管理器中直接创建,或者用create view view_name as select * from A,B where =语句创建视图 l 三个关于视图的存储过程: sp_help ; sp_...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric SQL database in Microsoft Fabric Returns a null value if the two specified expressions are equal. For...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft FabricReturns a null value if the two specified expressions are equal. For example, SELECT NULLIF(4,4) AS ...
Works in: SQL Server (starting with 2008), Azure SQL Database, Azure SQL Data Warehouse, Parallel Data WarehouseMore ExamplesExample Compare two expressions: SELECT NULLIF('Hello', 'Hello'); Try it Yourself » Example Compare two expressions: SELECT NULLIF('Hello', 'world'); Try it ...
SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric SQL database in Microsoft Fabric Returns a null value if the two specified expressions are equal. For example,SELECT...
除了基本的转换,NULLIF与其他SQL函数结合使用,可以实现更复杂的数据处理逻辑。比如,与COALESCE函数结合,可以实现多重默认值的逻辑: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 SELECT COALESCE(NULLIF(email, ''), 'no-email@example.com') AS email FROM users; 这个例子中,如果email是空字符串,则首先...
Applies to:SQL ServerAzure SQL DatabaseAzure SQL Managed InstanceAzure Synapse AnalyticsAnalytics Platform System (PDW)SQL analytics endpoint in Microsoft FabricWarehouse in Microsoft Fabric Returns a null value if the two specified expressions are equal. For example,SELECT NULLIF(4,4) AS Same, NULLI...
oracle nvl,nvl2,coalesce几个函数的区别 2016-11-03 16:43 −1.nvl(exp1,exp2) NVL lets you replace null (returned as a blank) with a string in the results of a query. If expr1 is null, then ... 费曼带我飞 0 3124 <123>
如果它们的数据类型不同，SQL 会将 replace-expression 转换为 check-expression 的数据类型，然后再进行...