In Oracle, we can declare a variable as shown in the following syntax: variable_name[CONSTANT]data_type[NOT NULL][:=|DEFAULT initial_value]; The following are the parameters which are provided in the syntax: variable_name – This defines the name that you wish to assign to your variable....
DEFINE[variable[=value]] UNDEFINE清除定义的变量 [c-sharp]view plaincopy SQL> define specialty=通信工程 SQL> define specialty DEFINE SPECIALTY ="通信工程"(CHAR) SQL> select xh,xm,xb,cssj,zxf from system.xs 2 where zym='&specialty'; XH XM XB CSSJ ZXF --- --- -- --- --- 061202 ...
变量名称 [constant] 类型 [not null] [:=value]; 语句解析: constant:定义常量,必须在声明时为其赋予默认值; not null:表示此变量不允许为null; :=value:在变量声明示,设置初始数据; 示例:定义变量 DECLARE v_resultA NUMBER := 100 ; -- 定义一个变量同时赋值 v_resultB NUMBER ; -- 定义一个变量没...
define variable_name = value (2).宣告和初始化DEFINE變數 //宣告define變數的時候必須同時初始化賦值變數 SQL> define num=1; 另外可以使用define命令顯示單個(define variable_name,不能顯示多個)或全部(define)的host變數的值和型別(型別都是char)。 (3).顯示指定的DEFINE變數值和型別 //使用define def_na...
sqlplus中如何使用绑定变量,可以通过variable来定义 [c-sharp]view plaincopy SQL> select * from tt where id=1; ID NAME --- --- 1 test SQL> select * from tt where id=2; ID NAME --- --- 2 test SQL> variable i number; SQL> exec ...
在sqlplus 环境中,声明变量的关键字:define variable declare 一、define关键字(host变量) host变量的作用是一个替换作用,是主机环境与oracle进行交互的变量,定义host变量时必须同时指定变量名和变量的值,定义变量不可以指定数据类型,define定义的变量默认其数据类型都是char。该变量只在当前session起作用 ...
CACHE cache_value: 指定序列缓存的个数,默认为20。 e.g. 定义了一个名为my_sequence的序列,从1开始递增,每次增加1,最大值为1000: CREATE SEQUENCE my_sequence START WITH 1 INCREMENT BY 1 MAXVALUE 1000; Alter Sequence my_sequence Increment By 3; --修改序列 DESC USER_SEQUENCES; --查看序列 (3...
針對 @publisher 指定「Oracle 發行者」的名稱、針對 @propertyname 指定xactsetjob 的值,並針對 @propertyvalue 指定disabled 的值。 範例 下列範例會啟用 Xactset 作業,並在執行之間設定三分鐘的間隔。 複製 -- This script uses sqlcmd scripting variables. They are in the form -- $(MyVariable). For ...
Click in the Initial Value column to toggle the Initial Value from Off to On. Working With Devices 5-11 Using the Custom Device Skin Creator 5.11.3.2 Inter-Integrated Circuit (I2C) and Serial Peripheral Interface (SPI) The process for configuring I2C and SPI interfaces is very similar. On ...
For example, declare a procedure as test(my_var VARCHAR2 IN) and call it as test('block.field') instead of declaring the procedure as test(my_var VARCHAR2 IN OUT) and calling it as test(:block.field). Explicitly associate the parameter name and value with => when the parameter list ...