using System.Data.SqlTypes; namespace SqlNullsCS { class Program { static void Main() { CompareNulls(); Console.ReadLine(); } private static void CompareNulls() { // Create two new null strings. SqlString a = new SqlString(); SqlString b = new SqlString(); // Compare nulls using ...
SQL Server Compare to NULLIf both columns arevarchars, I'd go with something like this:...
如果对SQL版本要求不低的话,利用OFFSET-FETCH来实现简直爽爆了。 COALESCE compare to ISNULL 上一节我们讲了讲一些字符串函数,其中漏掉了一个字符串函数即COALESCE,这个函数在SQL 2008+上才有,其中还有其他几个类似对字符串函数的处理,我们一起来看下。msdn对其定义为:按顺序计算变量并返回最初不等于 NULL 的第...
Nullable<int> i = null; Nullable<int> j = null; if (i == j) { // This branch is executed. } SQL 複製 -- Assume col1 and col2 are integer columns with null values. -- Assume that ANSI null behavior has not been explicitly -- turned off. Select… From… Where col1 = col...
Wait_type The type of wait that SQL Server has recorded in the engine, which is preventing a current request from being executed. Last_wait_type If this request has previously been blocked, this column returns the type of the last wait. Is not nullable. Wait_duration_ms The total wait ti...
EventDeclarationCompareFunctionParameter EventDeclarationSetParameter EventGroupContainer EventNotificationEventGroup EventNotificationEventType EventNotificationObjectScope EventNotificationTarget EventRetentionSessionOption EventSessionEventRetentionModeType EventSessionMemoryPartitionModeType EventSessionObjectName EventSessionScope...
In this article, I will talk about how we can compare tables in SQL Server in efficient way to identify differences and produce helpful statistics.
If the publication allows immediate updating subscriptions and an article in the publication has a column filter, you cannot filter out non-nullable columns without defaults. Queued Updating Tables included in a merge publication cannot also be published as part of a transactional publication that allo...
Fixed - The "Remember Password" option in the connection dialog wasn't being preserved when editing Advanced options and when editing a connection string saved in Publish, Schema Compare and other files Fixed - For connections show in the History tab with IntegratedAuthentication=true, the Authentic...
exc.ArgumentError: Mapper mapped class FDog->fdog could not assemble any primary key columns for mapped table 'fdog' 问题原因: 由于创建的模型之中没有创建主键字段 解决方法: 在该模型中创建一个字段主键即可 问题2.Textual SQL expression ‘-id’ should be explicitly declared as text(’-id’) ...