* Sets the current thread's copy of this thread-local variable * to the specified value. Most subclasses will have no need to * override this method, relying solely on the {@link #initialValue} * method to set the values of thread-locals. * * @param value the value to be stored in ...
以內嵌方式指派值給變數。 此值可以是常數或運算式,但是它必須符合變數宣告類型,或是必須可隱含轉換成該類型。 如需詳細資訊,請參閱運算式 (Transact-SQL)。@cursor_variable_name資料指標變數的名稱。 資料指標變數名稱的開頭必須是 at (@) 符號,且必須符合識別碼的規則。CURSOR 指定變數是本機...
You can use variables only in expressions, not instead of object names or keywords. To construct dynamic Transact-SQL statements, use EXECUTE. Although syntax rules for SET @cursor_variable include the LOCAL and GLOBAL keywords, when you use the SET @cursor_variable = CURSOR... syntax, the ...
In looking for people to hire, you look for three qualities: integrity, intelligence, and energy. And if they don't have the first, the other two will kill you! SQL SELECT @local_variable/SET @local_variable/DECLARE @local_variable 指定将(使用 DECLARE@local_variable创建的)给定的局部变量设...
SQL 复制 DECLARE my_cursor CURSOR GLOBAL FOR SELECT * FROM Purchasing.ShipMethod DECLARE @my_variable CURSOR ; SET @my_variable = my_cursor ; --There is a GLOBAL cursor declared(my_cursor) and a LOCAL variable --(@my_variable) set to the my_cursor cursor. DEALLOCATE my_cursor; GO ...
适用于:sql Server Azure SQL 数据库 Azure SQL 托管实例 Microsoft Fabric Warehouse Microsoft Fabric SQL 数据库中的 Azure Synapse Analytics SQL 分析终结点Microsoft Fabric 数据库中 将局部变量设置为表达式的值。 要分配变量,建议使用 SET @local_variable,而不是 SELECT @local_variable。 Transact-SQL 语法...
For more information, see CREATE TABLE (Transact-SQL).n A placeholder indicating that multiple variables can be specified and assigned values. When declaring table variables, the table variable must be the only variable being declared in the DECLARE statement....
Transact-SQL syntax conventionsSyntaxThe following syntax is for SQL Server and Azure SQL Database:syntaxsql Kopiera DECLARE { { @local_variable [AS] data_type [ = value ] } | { @cursor_variable_name CURSOR } } [ ,...n ] | { @table_variable_name [AS] } ::= TABLE ( { <...
C. Antipattern use of recursive variable assignment Avoid the following pattern for recursive use of variables and expressions: syntaxsql SELECT@Var =<expression containing @Var>FROM... In this case, it isn't guaranteed that@Varwould be updated on a row by row basis. For example,@Varmay be...
SQL Server 实用工具语句 存储过程函数 (Transact-SQL) 系统存储过程 (Transact-SQL) 系统表 (Transact-SQL) 系统视图 (Transact-SQL) 事务语句 (Transact-SQL) 变量(Transact-SQL) 变量(Transact-SQL) DECLARE @local_variable (Transact-SQL) SET @local_variable (Transact-SQL) ...