The number of rows in the table is limited only by the storage capacity of the server. You can assign properties to the table and to each column in the table to control the data that is allowed and other properties. For example, you can create constraints on a column to disallow null ...
在CREATE TABLE 或 ALTER TABLE 语句中,不必为 timestamp 数据类型指定列名,例如:SQL 复制 CREATE TABLE ExampleTable (PriKey int PRIMARY KEY, timestamp); 如果不指定列名,则 SQL Server 数据库引擎将生成 timestamp 列名;但 rowversion 同义词不具有这样的行为。 在使用 rowversion 时,必须指定列名,例如:...
如果使用者请求在成功创建的表中打开行集,则 SQL Server Native Client OLE DB 访问接口将打开游标支持的行集。可以在所传递的属性集中指示任何行集属性。 此示例创建一个 SQL Server 表。 复制 // This CREATE TABLE statement shows the details of the table created by // the following example code. //...
此範例會建立 SQL Server 資料表。 複製 // This CREATE TABLE statement shows the details of the table created by // the following example code. // // CREATE TABLE OrderDetails // ( // OrderID int NOT NULL // ProductID int NOT NULL // CONSTRAINT PK_OrderDetails // PRIMARY KEY CLUSTERE...
接下来让我们更新表格中的前50行。因为行数据被更新了,SQL Server将复制旧版本进入版本存储区。所以版本存储区中将有50行行版本。 -- update all the rows in the table update t_version set c2 ='test10' -- the following statement returns the count of versioned row. ...
The CTE was introduced into standard SQL in order to simplify various classes of SQL Queries for which a derived table just wasn't suitable. For some reason, it can be difficult to grasp the techniques of using it. Well, that's before Rob Sheldon explain
TheSQL Server Tables and Exchange Web Servicessample takes advantage of two powerful new features in SQL Server and Microsoft Exchange: table-valued user-defined functions, and Exchange Web Services. Table-valued user-defined functions in SQL Server return a table, much like a SQL Server view, ...
接下来让我们更新表格中的前50行。因为行数据被更新了,SQL Server将复制旧版本进入版本存储区。所以版本存储区中将有50行行版本。 -- update all the rows in the table updatet_versionsetc2='test10' -- the following statement returns the count of versioned row. ...
Table Hint This hint is used when certain kind of locking mechanism of tables has to be controlled. SQL Server query optimizer always puts the appropriate kind of lock on tables, when any of the Transact SQL operationsSELECT,UPDATE,DELETE,INSERTorMERGEare used. There are certain cases when the...
Views are virtual tables that we create from our actual master table. For example, if the actual table had "a" rows and "b" columns you can create many views, each with a-1, a-2...a-n rows and b-1, b-2...b-n columns. Basic thing that comes to our mind when we thin...