The time taken by the fast forward cursor to complete the operation is 8 seconds. Converting Cursor to While Loop Now, let us convert the above example toWHILE loop. To convert a cursor to while loop, first you have to find the total number of rows in the table. Then you have to ite...
Creating a SQL Server cursor with T-SQL is a consistent method that can process data on a set of rows. Once you learn the steps, you can easily duplicate them with various sets of logic to loop through data. Let’s walk through the steps: Declare Variables Declare the variables (file n...
5、open cursor后要注意close cursor declare--存储域名type t_curisrefcursor; domainNames t_cur; domainNamevarchar2(50) :='';--存储每个域下的网元类型cursormoTypeNames(domainVARCHAR2)ISselectt1.modelnamefrompm4h_mo.mdl_resmodel t1,pm4h_mo.mdl_domain t2wheret2.domainname=domainandt1.domainid=...
注意 SQL Server データ型が前の表に表示されない場合、そのデータ型はサポートされていません。次の例を含むサポートされていないデータ タイプ: binary()、varbinary()、image、cursor、rowversion、hierarchyid、sql_variant xml、空間ジオメトリ型、空間地域型、テーブル。
comes to row-by-row processingI would ask you what you are doing with that cursor/while loop.
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LEAVE read_loop; END IF;--结束标记,在循环体中判断并跳出。 END LOOP;--关闭游标 CLOSE cs1;--游标2 OPEN cs2; SET done=0;--REPEAT循环 REPEAT--FETCH 游标中的列必须要和INTO的列数量和类型一致。--如果游标中没有新的可用行,即Fetch到空行,则会触发NOT FOUND异常,就会把done设置为1。
In some scenarios, if there's a primary key on a table, aWHILEloop can be used instead of a cursor, without incurring in the overhead of a cursor. However, there are scenarios where cursors aren't only unavoidable, they're actually needed. When that is the case, if there's no requi...
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、...
I have the following stored process that doesn't work, every time I run it it stays in an infinite loop. The objective of the SP is to go through the table of products for each row to evaluate the result and if the result when counting the rows is greater than 0, the code ...