Variable names must begin with an alphabetical letter or an underscore, not a number. Using an underscore character to start a variable name is typically reserved for private instance fields. A link to further reading can be found in the module summary. ...
The name, or identifier, for a variable points to a memory location where information of a specific data type is stored. The syntax rules for variable names are as follows:Names must be limited to ASCII letters, digits, and the underscore character (_), all with hex values of 0x7F or ...
英文的翻译是：输入必须由变量开始 至于你写的代码肯定是代码的格式不正确造成的，检查等号前是否没有变量，或变量定义是否定义在普通语句的后面（有些严格的编译器要求变量定义在函数的前面）
syntaxsql Copy DECLARE { { @local_variable [AS] data_type } [ = value [ COLLATE <collation_name> ] ] } [ ,...n ] Arguments@local_variableThe name of a variable. Variable names must begin with an at (@) sign. Local variable names must comply with the rules for identifiers....
The name of a variable of any type exceptcursor,text,ntext,image, ortable. Variable names must start with one at sign (@). Variable names must follow the rules foridentifiers. property_name A property of a user-defined type. field_name ...
Each variable name must be unique; duplication is not allowed. Variable names can be up to 64 bytes long, and the first character must be a letter or one of the characters @, #, or $. Subsequent characters can be any combination of letters, numbers, nonpunctuation characters, and a pe...
Similarly, a function method that is a binary operator must be declared with only one parameter. Such function methods can only be invoked using the selected-name notation; they cannot be invoked using infix operator notation. The preceding examples show that we use a selected name to invoke a...
Well Underscore character(_) begin with your variable name is discouraged but it is legal and some people use it to identify as an private variable and some for naming it in caching variable. Go through with thislinktoo. Share Improve this answer ...
A variable's name can be any legal identifier — an unlimited-length sequence of Unicode letters and digits, beginning with a letter, the dollar sign "$", or the underscore character "_". The convention, however, is to always begin your variable names with a letter, not "$" or "_"...
VARIABLE rc REFCURSOR BEGIN OPEN :rc FOR SELECT DEPARTMENT_NAME, LAST_NAME, SALARY FROM EMP_DETAILS_VIEW WHERE SALARY > 12000 ORDER BY DEPARTMENT_NAME, LAST_NAME; END; / PL/SQL procedure successfully completed. SET PAGESIZE 100 FEEDBACK OFF TTITLE LEFT '*** Departmental Salary Bill ***'...