This example demonstrates how to change an existing table column’s nullability and data type.The Gender column in the HumanResources.Employeetable is originally NOT NULL and the original data type of the LoginIDcolumn is nvarchar(256): -- Make it Nullable ALTERTABLEHumanResources.Employee ALTERC...
This example demonstrates how to change an existing table column’s nullability and data type.The Gender column in the HumanResources.Employeetable is originally NOT NULL and the original data type of the LoginIDcolumn is nvarchar(256): -- Make it Nullable ALTERTABLEHumanResources.Employee ALTERC...
允许在正常的 T 允许的值旁边存储特殊标记 (NULL),表示“缺失的值”。例如,一个 Nullable(Int8) 类型的列可以存储 Int8 类型的值,而没有值的行将存储 NULL。
命名空間: System 組件: netstandard.dll, System.Runtime.dll 來源: Nullable.cs 表示可以指派 null 的實值類型。C# 複製 public struct Nullable<T> where T : struct類型參數T Nullable<T> 泛型型別的基礎實值型別。繼承 Object ValueType Nullable<T> ...
Learn more about the Microsoft.SqlServer.TransactSql.ScriptDom.TSqlBatch.TSqlBatch in the Microsoft.SqlServer.TransactSql.ScriptDom namespace.
組件:Microsoft.Data.Schema.ScriptDom.Sql (在 Microsoft.Data.Schema.ScriptDom.Sql.dll 中) 語法 VB複製 '宣告PublicOverridableSubVisit ( _ nodeAsNullableConstraint _ ) 參數 node 型別:Microsoft.Data.Schema.ScriptDom.Sql.NullableConstraint 指定的片段型別。
SparseColumnOption SpatialIndexingSchemeType SpatialIndexOption SpatialIndexRegularOption Sql100ScriptGenerator Sql110ScriptGenerator Sql120ScriptGenerator Sql130ScriptGenerator Sql140ScriptGenerator Sql150ScriptGenerator Sql160ScriptGenerator Sql80ScriptGenerator Sql90ScriptGenerator SqlCommandIdentifier SqlDat...
命名空間:Microsoft.SqlServer.TransactSql.ScriptDom 組件:Microsoft.SqlServer.TransactSql.ScriptDom (在 Microsoft.SqlServer.TransactSql.ScriptDom.dll 中) 語法 VB '宣告PublicOverridableSubExplicitVisit ( _ nodeAsNullableConstraintDefinition _ )'用途DiminstanceAsTSqlFragmentVisitorDimnodeAsNullableConstraintDefinitio...
Once the normalized script is re-generated from the SqlScriptGenerator class, it can then be run through a proper hash algorithm (in this sample we use SHA1) to calculate the hash value of the given script. Here is where we also handle the case sensitive / insensitive nature of the scrip...
1. Separate the ALTER COLUMN into another batch and run it first. Easy enough for a single one-off task but this is just one piece of a much larger process so there are reasons I don't want to do it that way. 2. Shove the PK create into a variable and use dynamic...