FILENAME=‘c:\Program Files\Microsoft SQL Server\MSSQL.1\mssql\data\AccountingLog.ldf’, SIZE=5MB, MAXSIZE=25MB, FILEGROWTH=5MB) GO 查看数据库的信息,使用以下语句执行: exec sp_helpdb ‘Accounting’ 2.创建表 创建表,其命令语法格式如下: CREATETABLE[database_name.[owner].]table_name ( <co...
FILENAME='C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA\AccountingLog.ldf', SIZE=5MB, MAXSIZE=25MB, FILEGROWTH=5MB ) 二、CREATE TABLE 创建表的具体语法: CREATETABLECustomers 详细语法: CREATETABLE[database_name.[owner].]table_name (<columnname><data type>[[DEFAULT <...
LEFT OUTER JOIN执行此操作，如下所示：UPDATE TableA SET columnA = '' FROM TableA LEFT...
SQL -- Skipping the column list, but keeping the values in orderINSERTdbo.ProductsVALUES(75,'Tire Bar',NULL,'Tool for changing tires.')GO 只要是在預設的結構描述中存取及變更資料表,就可以省略結構描述名稱。 因為ProductDescription資料行可以接受 Null 值及無值,所以在陳述式中便可以完全省略ProductDescr...
SQL -- Remove replication objects from the subscription database on MYSUB.DECLARE@subscriptionDBASsysnameSET@subscriptionDB = N'AdventureWorks2022Replica'-- Remove replication objects from a subscription database (if necessary).USEmasterEXEC sp_removedbreplication @subscriptionDBGO ...
SQL -- Dropping the optional dbo and dropping the ProductDescription columnINSERTProducts (ProductID, ProductName, Price)VALUES(3000,'3 mm Bracket',0.52)GO 更新products 表 键入并执行以下UPDATE语句,将第二种产品的ProductName从Screwdriver更改为Flat Head Screwdriver。
SQL -- Remove replication objects from the subscription database on MYSUB.DECLARE@subscriptionDBASsysnameSET@subscriptionDB = N'AdventureWorks2022Replica'-- Remove replication objects from a subscription database (if necessary).USEmasterEXEC sp_removedbreplication @subscriptionDBGO ...
TSQL是查询SQL Server的核心,而索引则是提高查询效能的主角,如要写出高效能TSQL则无可避免需搭配正确索引,因为SQL Server需透过正确索引才可以快速有效地找到与索引键值相关数据,有了正确索引SQL Server就不需要扫描数据页(data page)上每一笔数据,而在众多查询效能调校技术中,透过建立并设计正确索引算是最基本的手法...
Access Code - DELETE Statement with DISTINCTROW and T-SQL Access Now() vs. T-SQL GETDATE() ? ADD and SUBTRACT depending on the condition is CASE STATEMENT ADD COLUMN to variable table? Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a lar...
derived _table 可以使用 Transact-SQL 表值构造函数功能来指定多个行。 例如,SELECT * FROM (VALUES (1, 2), (3, 4), (5, 6), (7, 8), (9, 10) ) AS MyTable(a, b);。 有关详细信息,请参阅表值构造函数 (Transact-SQL)。column_alias...