CURSOR FOR Loop FOR employee_rec in c1 ---employee_rec直接用,不用提前定义 LOOP total_val := total_val + employee_rec.monthly_income; END LOOP; 当使用CURSOR FOR Loop时,不用我手工open cursor close cursor 应用: begin FOR emm IN ( SELECT ro_site, ns_site, product_line, wh_type FROM ...
游标Cursor逻辑运算符和物理运算符用于描述涉及游标操作的查询或更新的执行方式。 其中物理运算符描述用于处理游标(如使用键集驱动游标)的物理实现算法。 游标执行过程的每一步都涉及物理运算符。 而逻辑运算符描述游标的属性,如游标是只读。 逻辑运算符包括Asynchronous、Optimistic、Primary、Read Only、Scroll Locks、...
MySql游标、LOOP循环、REPEAT循环、WHILE循环、LEAVE跳出循环、LEAVE跳出整个存储过程、sql执行异常处理(判断标记即可)、Variable or condition declaration after cursor or handler declaration 参考示例:https://blog.csdn.net/xw1680/article/details/130119856 DELIMITER $$ DROP PROCEDURE IF EXISTS `sp_cursor_test3`...
B. Use WHILE in a cursor The following example uses@@FETCH_STATUSto control cursor activities in aWHILEloop. SQL DECLARE@EmployeeIDASNVARCHAR(256)DECLARE@TitleASNVARCHAR(50)DECLAREEmployee_CursorCURSORFORSELECTLoginID, JobTitleFROMAdventureWorks2022.HumanResources.EmployeeWHEREJobTitle ='Marketing Speciali...
Often, cursors are used to perform a function row by row. If there is a primary key on a table, you can usually write a WHILE loop to do the same work without incurring the overhead of a cursor. The following example is very simple but demonstrates this approach:code Copy ...
在Web 服务器上打开 SQL Server Enterprise Manager。 为NT AUTHORITY\LOCAL SERVICE 创建 SQL Server 登录名。 通过创建数据库用户授予对 DemoDB 数据库的登录访问权限。 将数据库用户添加到 db_datareader 和 db_datawriter 数据库角色。 步骤2:设置 Visual Stu...
CURSOR vs. CTE Cursor with input-parameter Cursorfetch: The number of variables declared in the INTO list must match that of selected columns. Cursors vs while loop Customize email message - SQL Server Agent Data Archiving/Purging process Data conversion from non-unicode character to unicode charac...
The procedure in the remote server is executed, and the result sets are returned to the local server and loaded into the table in the local server. In a distributed transaction, execute_statement cannot be issued against a loopback linked server when the connection has multiple active result ...
-- Open the cursor. OPEN tables; -- Loop through all the tables in the database. FETCH NEXT FROM tables INTO @tablename; WHILE @@FETCH_STATUS = 0 BEGIN -- Do the showcontig of all indexes of the table INSERT INTO #fraglist EXEC ('DBCC SHOWCONTIG ('''...
Installing and Configuring Microsoft SQL Server Defining Database Objects Enforcing Data Integrity and Business Rules Transactions, Locking, and Concurrency SQL Language Support Implementing Cursors Tuning SQL Statements Using ODBC Developing and Administering Database Replication Migrating Your Data and Applicati...