Seems really a confusion with SQL. For SQL, you have to use column IS NULL rather than column=NULL (which is false because two unknown values are not equal)For C# the "is" keyword is decribed at /en-us/dotnet/csharp/language-reference/keywords/is and as you can see it's unrelated ...
i want to check for null values in the database while using datareader . asp.net,c#,sql how can i do it? my code: SqlDataReader reader = command.ExecuteReader(); while (reader.Read()) { //Check for null while reading regProp.regId = reader[0].ToString(); //Prefer: reader["Reg...
使用Transact-SQL 查询创建一个新表 右键单击 Trade 数据库节点并选择“新建查询”。 在脚本窗格中,粘贴以下代码: 复制 CREATE TABLE [dbo].[Fruits] ( [Id] INT NOT NULL, [Perishable] BIT DEFAULT ((1)) NULL, PRIMARY KEY CLUSTERED ([Id] ASC), FOREIGN KEY ([Id]) REFERENCES [dbo].[Products...
First post here, and with the work I'll be doing over the next few months, I imagine it will be the first of many questions, which I aim to return the thanks in contributions to other peoples questions! This one has been driving me up the wall for 2 days now, and...
You pass QUOTENAME a string to be delimited and a one-character string to use as the delimiter. The delimiter can be a square bracket or a single or double quotation mark. This function is mainly designed for preparing delimited SQL identifiers, which is why it only accepts the type sysname...
How to: View Events for the Integration Services Service How to: View Integration Services Packages in SQL Server Management Studio How to: View Data Transformation Services Packages in SQL Server Management Studio How to: Import or Export a Package by Using SQL Server Management Studio ...
IF l_UserID IS NULL SELECT FirstName, LastName, EMail FROM Users WHERE UserID = l_UserID; END IF; This is just illustration, for a solutions, stick to what I posted earlier. Sorry, you can't reply to this topic. It has been closed....
Applies to: SQL Server Azure SQL Managed Instance Transactional replication allows you to specify how data changes are propagated from the Publisher to Subscribers. For each published table, you can specify one of four ways that each operation (INSERT, UPDATE, or DELETE)...
SQL Server One of the great mysteries in security management is the modus operandi of criminal hackers. If you don't know how they can attack you, how can you protect yourself from them? Prepare to be enlightened. This article is not intended to show you how to hack something, but rather...
OK thanks for the adivice, but still how do I simulate testing for NULL, as in: IF Number IS NULL BEGIN SET Number = 0; END IF; This does not work, syntax error. Though it does work in MSSQL. Thanks in advance. Sorry, you can't reply to this topic. It has been closed....