Column col21; col21 = new Column(tb, "Number", DataType.Int); col21.Nullable = false; tb.Columns.Add(col21); // Create the table of the instance of SQL Server. tb.Create(); // Create a unique, clustered, primary key index on the integer column. This is required...
Applies to: SQL Server 2012 (11.x) and later. Creates the new table as a FileTable. You don't specify columns because a FileTable has a fixed schema. For more information, see FileTables. column_name AS computed_column_expression An expression that defines the value of a computed column...
ColumnExpression.MakeNullable 方法 參考 意見反應 定義 命名空間: Microsoft.EntityFrameworkCore.Query.SqlExpressions 組件: Microsoft.EntityFrameworkCore.Relational.dll 套件: Microsoft.EntityFrameworkCore.Relational v8.0.0 讓此資料行成為可為 Null。 C# 複製 public abstract Microsoft.E...
String@Nullable[] columnNames)throwsSQLException {//第一部分PreferQueryModepreferQueryMode=connection.getPreferQueryMode();booleanshouldUseParameterized=false;//第二部分QueryExecutorqueryExecutor=connection.getQueryExecutor();//第三部分Objectkey=queryExecutor .createQueryKey(sql, replaceProcessingEnabled, shoul...
NON_PARTITION_COLUMN, NOTEBOOK_NOT_FOUND, NOT_NULL_ASSERT_VIOLATION, NOT_NULL_CONSTRAINT_VIOLATION, NO_HANDLER_FOR_UDAF, NULLABLE_COLUMN_OR_FIELD, NULLABLE_ROW_ID_ATTRIBUTES, PARTITION_COLUMN_NOT_FOUND_IN_SCHEMA, PS_INVALID_EMPTY_OPTION, PS_INVALID_OPTION, PS_INVALID_OPTION_TYPE, PS_INVALID_...
All the values that make up the foreign key are set toNULLwhen the corresponding row in the parent table is deleted. For this constraint to execute, the foreign key columns must be nullable. SET DEFAULT All the values that comprise the foreign key are set to their default values when the...
Re-create a table with a different hash distribution column. Re-create a table as replicated. Create a columnstore index on just some of the columns in the table. Query or import external data. Note Since CTAS adds to the capabilities of creating a table, this topic tries not to repeat ...
least 292. For a column, it must be larger than the current inline length. If this error occurs when altering the type (or some supertype of this type) to add an attribute, either the attribute cannot be added or the type must be dropped and re-created with a larger INLINE LENGTH ...
column-name Specifies the name of the column. The name is an SQL identifier and must be unique within the RETURNS TABLE clause for the function. data-type Specifies the data type of the column. The column is nullable. AS LOCATOR Specifies that the function returns a locator to the value ...
to investigate the nullability of any computed column in a table. An expression that is nullable can be turned into a nonnullable one by specifying ISNULL with the check_expression constant, where the constant is a nonnull value substituted for any NULL result. REFERENCES permission on the type...