T-SQL (Transact-SQL) is a set of programming extensions from Sybase and Microsoft that add several features to the Structured Query Language (SQL), including transaction control, exception and error handling, ro
SQL> define b='a'; SQL> define DEFINE _DATE ="01-4月 -08"(CHAR) DEFINE _CONNECT_IDENTIFIER ="db11"(CHAR) DEFINE _USER ="XYS"(CHAR) DEFINE _PRIVILEGE =""(CHAR) DEFINE _SQLPLUS_RELEASE ="1101000600"(CHAR) DEFINE _EDITOR ="Notepad"(CHAR) DEFINE _O_VERSION = "Oracle Database 11g...
T-SQL之DECLARE,SET,PRINT语句 1.DECLARE语句 DECLARE语句是数据声明语句,主要作用是声明局部变量、函数、存储过程或游标变量等; 基本语法格式: DECLARE { { @local_variable [AS] data_type...SET语句为数据赋值语句,可以对局部变量进行赋值,也可以用于执行SQL命令时设定SQL Server中的系统处理选项; 基本语法格式:...
You can set the desired number of retries by changing the value assigned to the variable @retry at the beginning of the code; it is currently set to 2. After running the code in Figure 3 for the first time, examine the contents of ErrorLog. Note that the transaction completed ...
Instead, use a table variable or a memory-optimized table with DURABILITY=SCHEMA_ONLY. Feature DTC Memory-optimized tables and natively compiled stored procedures cannot be accessed from distributed transactions. Use SQL transactions instead. Feature EXECUTE WITH RECOMPILE The option WITH RECOMPILE is ...
is that most other programming languages usually use the “string” primitive data type or the “String” class to define strings. With SQL Server, a string variable is defined using the “varchar” data type. The following T-SQL statement creates a SQL string that allows for 100 characters:...
SQL Server provides the following flow control keywords. BEGIN… END— Define boundaries for a block of commands that are run together. RETURN— Exit a server code module (stored procedure, function, and so on) and return control to the calling scope. You ca...
在命令行运行sql*plus是使用sqlplus命令来完成的,该命令适用于任何操作系统平台, 语法如下: sqlplus [username]/[password][@server] 如上所示:username用于指定数据库用户名,password用于指定用户口令,server则用于指定主机字符串(网络服务名).当连接到本地数据时,不需要提供网络服务名,如果要连接到远程数据库,则必须...
LOG ON is followed by a comma-separated list of <filespec> items that define the log files. If LOG ON is not specified, one log file is automatically created, which has a size that is 25 percent of the sum of the sizes of all the data files for the database, or 512 KB, ...
Referencia de Transact-SQL para usar la instrucción DECLARE para definir variables locales para su uso en un lote o un procedimiento.