I know that values can be null. I understand the use for that, and I understand that a null value isn't actually anything at all. It's not here. It's not there. It's not true false, 0, -1, 1, 17, or anything. What I do not understand is why we would want a logical oper...
The SQL COALESCE function returns the first non-null value in a list. It helps handle null values by substituting with the first non-null alternative. Learn more.
In addition, SSMA for Access now supports conversion of multiple standard functions (ISNULL, IIF, etc.). Important With SSMA v8.5, .NET 4.7.2 is an installation pre-requisite. If you need to install this version, you can download the runtime...
[SQLShackSecurity] where UserID = rtrim(ltrim(@UserID))) if NOT @WhatICanSee is null Begin select YearMth ,case when @WhatIcanSee <> 'Team1' then 0 else SUM (Team1_Revenue) end as Team1_Revenue , SUM (Team2_Revenue) as Team2_Revenue, case when @WhatIcanSee = 'Team1' then ...
the standard and an expression like'some string' + NULL ..always returns NULL. Thus, in a ...
In my first article I wrote how to recover deleted data from SQL Server. I received queries inquiring, if it is possible to recover the deleted data, is it also possible to know who deleted it and when ? Let me explain it with simple example : Now, you c
'IsComputed') = 1 THEN 1 WHEN DATA_TYPE = 'TIMESTAMP' THEN 1 ELSE 0 END AS BIT) AS IsStoreGenerated, CAST(CASE WHEN pk.ORDINAL_POSITION IS NULL THEN 0 ELSE 1 END AS BIT) AS PrimaryKey, ISNULL(pk.ORDINAL_POSITION, 0) PrimaryKeyOrdinal, CAST(CASE WHEN fk.COLUMN_NAME IS NULL ...
SQL关键字 不等号(!=,<>) 查询出来的结果集不包含有当前字段为null的数据 <> 是标准的sql语法, 开发中尽量使用<>, 会将字段为null的数据也当做满足不等于的条件而将数据筛选掉 !=不能比较null值,最好用ISNULL()转一下在比较 Like LIKE 支持 ASCII 模式匹配和 Unicode 模式匹配。
Additionally, T-SQL is an extension of SQL, allowing users to do more. Notably, T-SQL offers row processing, declared variables, error and exception handling, the ISNULL function, and additional support functions for string and data processing. T-SQL also provides transaction control with command...
generally in sql server we are using the terms SPID and session_id .can i know what is the difference between them ?Thanks.All replies (1)Tuesday, October 9, 2018 2:06 PM ✅Answeredhttps://dba.stackexchange.com/questions/145032/differences-between-spid-and-session-idPlease use Marked a...