1、创建包含sql命令的sql脚本文件 文件中包含一些列的sql语句,每条语句最后以;结尾,文件内容示例如下: --创建表,使用“--”进行注释 create table 表名称 ( Guid Varchar(38) not null primary key, Title Varchar(255), ) TYPE=InnoDB; --在表A中增加字段Status alter table A add Status TinyInt default ...
4、键共享(FOR KEY SHARE) 其行为类似于FOR SHARE,只是锁较弱:SELECT FOR UPDATE被阻止,而不是SELECT FOR NO KEY UPDATE。键共享锁会阻塞其他事务执行修改键值的DELETE或者UPDATE,但不会阻塞其他UPDATE,也不会阻止SELECT FOR NO KEY UPDATE、SELECT FOR SHARE或者SELECT FOR KEY SHARE。 5、行级锁冲突 要求的锁...
FILENAME = 'F:\sql server\file1.ndf', SIZE = 3, MAXSIZE = 80, FILEGROWTH = 2 ) TO FILEGROUP dataGroup /*2、增加事务日志文件 logFile0 和 logFile1 */ ALTER DATABASE MISS ADD LOG FILE ( NAME = 'logFile0', FILENAME = 'F:\sql server\logFile0.ldf', SIZE = 3, MAXSIZE = 80,...
UPDATE TblLeaving SET approvedBy=NEW.userID WHERE approvedBy=OLD.userID END; But, the statement produced an error : ERROR [42000] [MySQL][ODBC 5.1 Driver][mysqld-5.0.24-community-nt]You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version...
If you omit NULL and NOT NULL, the current setting of SET NULL determines whether null values are allowed in the field. However, if you omit NULL and NOT NULL and include the PRIMARY KEY or UNIQUE clause, the current setting of SET NULL is ignored and the field defaults to NOT NULL....
public string InsertCommand { get; set; } 属性值 String SqlDataSource 插入数据所用的 SQL 字符串。 示例 本部分包含两个代码示例。 第一个代码示例演示如何使用 SqlDataSource 控件和简单的 Web 窗体页将数据插入数据库。 第二个 GridView 代码示例演示如何从 Microsoft SQL Server 检索数据并将其显示在 ...
from one SQL Server edition to another edition of SQL Server. Installingan instance of SQL Server on a local computer by using syntax and parameters specified in a configuration file. You canuse this method to copy an installation configuration to multiple computers, or to install multiple ...
Visual FoxPro uses the default value if you use the ALTER TABLE - SQL command to remove autoincrementing for the field. PRIMARY KEY | UNIQUE PRIMARY KEY creates a primary index for the field specified in FieldName1. UNIQUE creates a candidate index for the field specified in FieldName1. ...
set ID=13 where ID=10 Below is the output from the subscriber table. Using the script below, we updated the primary key value in the subscriber database to 13, which was originally 10. -- Run this on publisher DB update [dbo].[REPLT_1] ...
IdentityValueKeyOption IfStatement IgnoreDupKeyIndexOption IIfCall ImportanceParameterType IndexDefinition IndexExpressionOption IndexOption IndexOptionKind IndexStatement IndexStateOption IndexTableHint IndexType IndexTypeKind InlineDerivedTable InlineFunctionOption InlineResultSetDefinition InPredicate InsertBulkColumnDef...