VB.NET中使用Linq TO SQL添加数据后获得自增长列ID: Dim tempOrdre As New Order With { .CustomerID = cmbCustomerName.SelectedValue.ToString, .ProductID = cmbProductSpec.SelectedValue.ToString, .ProductNumber = txtProductNumber.Text.Trim, .BatchNO = txtBatchNO.Text.Tri
原文:SQL点滴12-SQL Server备份还原数据库中的小把戏 备份数据库时出现一个不太了解的错误 ,错误信息“is formatted to support 1 media families, but 2 media families are expected according to the backup device specification”.如下图: 解决办法是首先选中击上一次备份的文件,点击Remove,去掉当前的备份文件,然后再点击OK备份.这样才能正确的备份.也在微软帮助
不解释: ---先创建外键的column ALTER TABLE tblLicenses ADD ProductID int not null; ---添加外键 ALTER TABLE tblLicenses ADD FOREIGN KEY (ProductID) REFERENCES tblProducts(ID) ---先创建外键的column Alter Table tblActivationRecords Add LicenseID bigint not null; ---添加带名字的外
在sql语句中添加变量. declare @local_variable data_type 声明时需要指定变量的类型, 可以使用set和select对变量进行赋值, 在sql语句中就可以使用@local_variable来调用变量 声明中可以提供值,否则声明之后所有变量将初始化为NULL. 例如:declare @id int declare @id int = 3 set @id=2 select id select @id = column_id from table where colu
添加远程用户root密码为password grant all privileges on *.* to root@localhost identified by '123321' with grant option grant all privileges on *.* to root@"%" identified by '123321' with grant option