基於SQL Server 系統資料類型的別名類型。 別名資料類型是利用 CREATE TYPE 陳述式建立的,在這之後才能在資料表定義中使用它們。 在 CREATE TABLE 陳述式期間,可以覆寫別名資料類型的 NULL 或 NOT NULL 指派。 不過,長度規格無法變更;在 CREATE TABLE 陳述式中無法指定別名資料類型的長度。 CLR 使用者定義型別
table_name can be a maximum of 128 characters, except for local temporary table names (names prefixed with a single number sign (#)) that can't exceed 116 characters. AS FileTable Applies to: SQL Server 2012 (11.x) and later. Creates the new table as a FileTable. You don't ...
如果您创建该表后另一个用户在使用该表,则 SQL Server 将在您断开连接并且所有其他会话不再使用该表时将其删除。 conn.Execute("SELECT newscomment_user_id AS user_id, COUNT(*) AS counter INTO #userNewsComment1 " _ & " FROM newsComment GROUP BY newscomment_user_id ") '把从newsComment中或的...
To create a local temporary table, precede the table name with #. For explanations and guidance on temporary tables, see Temporary tables in dedicated SQL pool in Azure Synapse Analytics. column_name The name of a table column. Column options COLLATE Windows_collation_name Specifies the collation...
Create a temporal table with a user-defined history table Alter non-temporal table to be a system-versioned temporal table Show 3 more Applies to: SQL Server 2016 (13.x) and later versions Azure SQL Database Azure SQL Managed Instance ...
and you use this table to query for specific information in your stored procedures. SQL Server also offers you a way to create temporary tables. These temporary tables are created the same way, but you create and destroy them on-the-fly. These temporary tables are beneficial when you need ...
SQL Server 执行时间: CPU 时间 = 2281 毫秒,占用时间 = 19726 毫秒。 select with temporary table: 20140 ms *** 表'SalesOrderHeader'。扫描计数 0,逻辑读取 764850 次,物理读取 17 次,预读 0 次,lob 逻辑读取 0 次,lob 物理读取 0 次,lob 预读 0 次。 表'#4E88ABD4'。扫描计数 1,逻辑读取 12...
table_name The name of the new table. To create a local temporary table, precede the table name with#. For explanations and guidance on temporary tables, seeTemporary tables in dedicated SQL pool in Azure Synapse Analytics. column_name
SQL Server 执行时间: CPU 时间=2281毫秒,占用时间=19726毫秒。 selectwithtemporarytable:20140ms *** 表'SalesOrderHeader'。扫描计数0,逻辑读取764850次,物理读取17次,预读0次,lob 逻辑读取0次,lob 物理读取0次,lob 预读0次。 表'#4E88ABD4'。扫描计数1,逻辑读取12331次,物理读取0次,预读0次,lob 逻辑...
In ad hoc query scenarios, such as SELECT FROM EXTERNAL TABLE, PolyBase stores the rows that are retrieved from the external data source in a temporary table. After the query completes, PolyBase removes and deletes the temporary table. No permanent data is stored in SQL tables. ...