Transact-SQL 编程语言提供了一些 SET 语句,这些语句可以更改特定信息的当前会话处理。 SET 语句可分为下表中列出的几个类别。 有关使用 SET 语句设置局部变量的信息,请参阅 SET @local_variable (Transact-SQL)。 展开表 类别语句 日期和时间语句 SET DATEFIRST SET DATEFORMAT 锁定语句 SET DEADLOCK_PRIORITY ...
DEALLOCATE my_cursor; GO --There is now only a LOCAL variable reference --(@my_variable) to the my_cursor cursor. E. 使用 SET 定义游标 以下示例使用 SET 语句定义游标。 SQL 复制 DECLARE @CursorVar CURSOR; SET @CursorVar = CURSOR SCROLL DYNAMIC FOR SELECT LastName, FirstName FROM Adventu...
You can use variables only in expressions, not instead of object names or keywords. To construct dynamic Transact-SQL statements, useEXECUTE. Although syntax rules forSET @cursor_variableinclude theLOCALandGLOBALkeywords, when you use theSET @cursor_variable = CURSOR...syntax, the cursor is create...
Column, parameter, or variable #2: Cannot find data type test_type. Combining conditional COUNTs in one GROUP BY query Commenting out an SQL Line when using Dynamic SQL Common table expression defined but not used.. why? Common Table Expression Select Into With Subquery Common Table Expressio...
SQL复制 -- Use number1 and number2 tables to demonstrate set operators in this page.>CREATETEMPORARYVIEWnumber1(c)ASVALUES(3), (1), (2), (2), (3), (4); >CREATETEMPORARYVIEWnumber2(c)ASVALUES(5), (1), (1), (2); >SELECTcFROMnumber1EXCEPTSELECTcFROMnumber2; 3 4 >SELECTcF...
Variable 'sql_mode' can't be set to the value of 'NULL'解决方法 产生原因: 这是由于导出的sql数据文件中的某些注释语句比如下面的注释语句引起的 ...0./*!40101 SET SQL_MODE=@OLD_SQL_MODE*/;0./*!40014 SET NAMES UTF8*/... 解决方法: 删除注释...
Check for active asynchronous statistics jobs by querying the sys.dm_exec_background_job_queue dynamic management view. If there are active jobs, either allow the jobs to complete or manually terminate them by using KILL STATS JOB. RESTRICTED_USER RESTRICTED_USER allows for only members of the ...
指定将(使用 DECLARE@local_variable创建的)给定的局部变量设置为指定的表达式。 建议将 SET@local_variable而不是 SELECT@local_variable用于变量赋值。 在第一个示例中,将变量 @var1 赋给 Generic Name 作为它的值。在 Customers 表中不存在为 CustomerID 指定的值,因此对该表的查询不返回行。该变量将保留 Gene...
The MySQL server maintains system variables that configure its operation. A system variable can have a global value that affects server operation as a whole, a session value that affects the current session, or both. Many system variables are dynamic and can be changed at runtime using theSET...
Ifselect_statementcontains an ORDER BY clause in which the columns are not unique row identifiers, a DYNAMIC cursor is converted to a KEYSET cursor, or to a STATIC cursor if a KEYSET cursor cannot be opened. This also occurs for a cursor defined by using SQL-92 syntax but without the STA...