You declare PL/SQL variables, constants and types in declare block. The syntax is <name> [CONSTANT] <datatype> [NOT NULL] [:= | DEFAULT <expr>] <name> is the name of the variable or constant; <datatype> may be scalar, composite datatype, reference or LOB; <expr> is a literal v...
DECLARE [ OR REPLACE ] [ VARIABLE ] variable_name [ data_type ] [ { DEFAULT | = } default_expression ] Parameters OR REPLACE 如果已指定,将替换同名的变量。 variable_name 变量的名称。 该名称可以使用session或system.session进行限定。 除非指定了OR REPLACE,否则该名称在会话中必须是唯一的。
The DECLARE statement initializes a U-SQL variable.SyntaxVariable := System_Variable | User_Variable. System_Variable := '@@'+Name. User_Variable := "@"+Unquoted_Identifier. Variables allow you to name scalar and rowset expressions. A simple example should illustrate how this works:U-SQL ...
A variable declaration consists of a name that is assigned to the variable and the data type of the variable. Optionally, the variable can be initialized to a default value within the variable declaration. Syntax nameCONSTANTtypeNOT NULL:=DEFAULTexpressionNULL Description name Specifies an identifier...
Syntax DECLARE { {{ @local_variable [AS] data_type } | [ =value ] } | { @cursor_variable_name CURSOR } } [,...n] | { @table_variable_name [AS] | <user-defined table type> } ::= TABLE ( { <column_definition> | } [ ,....
syntaxsql DECLARE{ { @local_variable[AS]data_type} [ = value [COLLATE<collation_name>] ] } [ ,...n ] Arguments @local_variable The name of a variable. Variable names must begin with an at (@) sign. Local variable names must comply with the rules foridentifiers. ...
Syntax error converting thevarcharvalue '123.4'toacolumnofdata typeint. 在将varchar 值'123.4' 转换成数据类型int 时失败。 要返回一个合法的数值,就必须使用能处理这个值的数据类型。对于这个例子,存在多个可用的数据类型。如果通过CAST()函数将这个值转换为decimal类型,需要首先定义decimal值的精度与小数位数。在...
Transact-SQL Syntax Conventions DECLARE { {{ @local_variable [AS] data_type } | [ =value ] } | { @cursor_variable_name CURSOR } } [,...n] | { @table_variable_name [AS] | <user-defined table type> } ::= TABLE ( { <column...
mysql 语句支持declare么mysql的declare 在导入存储过程时经常遇见下列DECLARE报错的问题: Error Code : 1064You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 3(0 m mysql 语句支持declare么 数据库 my...
syntaxsql DECLARE{ { @local_variable[AS]data_type} [ = value [COLLATE<collation_name>] ] } [ ,...n ] 参数 @local_variable 变量的名称。 变量名必须以 at 符 (@) 开头。 局部变量名称必须符合标识符规则。 data_type 任何系统提供的公共语言运行时 (CLR) 用户定义表类型或别名数据类型。 变量的...