Understand how SQL NULLIF compares two values and returns NULL if they are equal. Learn syntax and examples for using NULLIF in SQL queries.
Script created by SQL Compare version 13.4.5.6953 from Red Gate Software Ltd at 11/13/2018 5:18:41 PM*/SETNUMERIC_ROUNDABORTOFFGOSETANSI_PADDING, ANSI_WARNINGS, CONCAT_NULL_YIELDS_NULL, ARITHABORT, QUOTED_IDENTIFIER, ANSI_NULLSONGOSETXACT_ABORTONGOSETTRANSACTIONISOLATIONLEVELSerializableGOBEGINTRANS...
Data Type: Consider the data type of the variable or field. Some programming languages differentiate between null and blank values based on the data type. For example, in languages like Java, null is used for reference types, while blank can be used for primitive types. Semantics: Think about...
后续版本的 Microsoft SQL Server 将删除该功能。请避免在新的开发工作中使用该功能,并着手修改当前还在使用该功能的应用程序。 The CompareNull property controls evaluation of NULL for equality. 语法 复制 object .CompareNull [=value] Parts object An expression that evaluates to an object in the Applie...
value SqlGuid 要比較的 SqlGuid。 傳回 Int32 帶正負號的數字,表示執行個體與物件的相對值。 展開資料表 傳回值 條件 小於零 這個執行個體小於物件。 零 這個執行個體與物件相同。 大於零 這個執行個體大於物件。 -或- 物件為 Null 參考 (Nothing)。 另請參閱 比較GUID 和 uniqueidentifier 值 S...
SqlDateTime 要比較的SqlDateTime結構。 傳回 Int32 帶正負號的數字,表示執行個體與物件的相對值。 傳回值條件 小於零這個執行個體小於SqlDateTime。 零這個執行個體和SqlDateTime相同。 大於零這個執行個體大於SqlDateTime -或- SqlDateTime為 null 參考 (在 Visual Basic 中為Nothing) ...
UNION allows you to compare all columns very quickly, and also handles comparing NULL values to other NULLs successfully, which a join clause or a WHERE condition doesn't normally do. It also allows you to very quickly see which rows are missing in either table, which only a FULL OUTER JO...
Collect the nearest values and then determine which you want to keep. If you have a cap in th...
SqlInt64 SqlMoney SqlNotFilledException SqlNullValueException SqlSingle SqlString SqlTruncateException SqlTypeException SqlXml StorageState ดาวน์โหลด PDF Learn .NET API browser System.Data.SqlTypes SqlInt16 Methods C# C# ...
Oracle PL / SQL Select Query Null Value Compare SQL> SQL> select * from dual where null=null; no rows selected SQL> --- SQL> select * from dual where null <> null; no rows selected SQL> --- SQL> select * from dual where null is null; D - X SQL> Related examples in the sam...