ENTITY "查询窗口" AS QueryWindow ENTITY "变量声明" AS DeclareVariable ENTITY "变量定义" AS DefineVariable ENTITY "变量赋值" AS AssignValue ENTITY "变量使用" AS UseVariable SSMS --|> QueryWindow QueryWindow --|> DeclareVariable QueryWindow --|> DefineVariable QueryWindow --|> AssignValue Quer...
SQL> help define DEFINE---Specifies a substitutionvariableandassigns a CHAR valuetoit,orlists the valueandvariabletypeofa singlevariableorallvariables. DEF[INE] [variable] | [variable=text]variable:定义的变量名text:变量的char值 例子: --使用define命令定义vtest变量,并分配给它一个char值test123SQL>d...
It uses it again whenever you reference the variable name. After a user variable is in place, you need to use theUNDEFINEcommand to delete it: UNDEFINEcolum_name The DEFINE and VERIFY Commands Use the DEFINE command to create and assign a value to a variable. 定义一个替代变量 Use the UND...
DEFINE _SQLPLUS_RELEASE = "1002000400" (CHAR) DEFINE _EDITOR = "ed" (CHAR) DEFINE _O_VERSION = "Oracle Database 10g Release 10.2.0.4.0 - Production" (CHAR) DEFINE _O_RELEASE = "1002000400" (CHAR) VARIABLE变量和DEFINE变量不同的是其需要指定变量类型,类似编程语言中的强类型和弱类型变量。前...
本过程介绍如何定义用于存储 CDC 状态的包变量。 该CDC 状态变量由 CDC 控制任务加载、初始化和更新,并且由 CDC 源数据流组件用于确定针对更改记录的当前处理范围。 可对 CDC 控制任务和 CDC 源所共有的任何容器定义该 CDC 状态变量。 这可以在包级别,但也可以位于其他容器(如循环容器)上。
# Set the path context to the local, default instance of SQL Server and get a reference to AdventureWorks2022 CD \sql\localhost\default\databases $db = get-item AdventureWorks2022 #Define a Default object variable by supplying the parent database and the default name in the constructor. $def...
{//Connect to the local, default instance of SQL ServerServer srv =newServer();//Reference the AdventureWorks2022 database.Database db = srv.Databases["AdventureWorks2022"];//Define a UserDefinedTableType object variable by supplying the//database and name in the constructor.UserDefinedTab...
get_line(value, index):获取缓冲区的单行信息 get_lines(array, index):以数组形式来获取缓冲区的多行信息 代码语言:javascript 代码运行次数:0 运行 AI代码解释 begin dbms_output.put('a1');dbms_output.put('b2');dbms_output.new_line();--输出缓存中的信息,新起一行 ...
This value is unique within the transaction. If you attempt to specify a column that doesn't meet the above data type or nullability requirements, the system will throw an error. If you don't explicitly specify nullability, the system will define the column as NULL or NOT NULL per the ...
-- Execute a stored procedure or function [ { EXEC | EXECUTE } ] { [ @return_status = ] { module_name [ ;number ] | @module_name_var } [ [ @parameter = ] { value | @variable [ OUTPUT ] | [ DEFAULT ] } ] [ ,...n ] [ WITH <execute_option> [ ,...n ] ] } [ ;...