在Case函数中,可以使用BETWEEN,LIKE,IS NULL,IN,EXISTS等等,通过在Case函数中嵌套Case函数,在合计函数中使用Case函数等方法,也可以在Check、触发器等中使用Case。 2、循环分支For和While 2.1For循环 for 变量 in 开始数值...结束数值 loop end loop; 1. 2.2While循环 只要表达式成立就执行循环语句 **while** 条...
In this article, we will explore how to use SQL Server scroll cursors to selectively pick a row from the cursor instead of looping through rows one by one. Solution ASQL Server cursoris T-SQL logic to loop through a finite number of rows which are determined by the query that is used ...
Again, it really depends on your situation. I almost always use a cursor to loop through records...
While SQL While loop is quicker than a cursor, reason found that cursor is defined by DECLARE CURSOR. Every emphasis of the loop will be executed inside system memory and consuming required server assets. On the off chance that the iteration count is extremely high, a...
游标的for循环可以隐式地 open,fetch,close 游标以及循环处理结果集。 FOR i IN v_cursor LOOP XXX; END LOOP; 9、带参数的游标: CURSOR cursor_name(param type DEFAULT default_val) IS SELECT ---; 三 基础知识 (1)标量变量:CURSOR cursor_name IS SELECT ... FROM ... ; ...
Row-By-Row Processing Without Cursor: Here is a simple tip on how to loop through table rows without cursor in SQL Server.
for emm in(select * from cat) loop null; --you can use emm.table_name and emm.table_type end loop; return ; end StudyFor; 是不是更方便,我要使用的查询结果,只需使用emm.table_name和emm.table_type即可。 查找了Oracle的官方文档,似乎没有看见for loop的此种用法。确实很奇妙,只是不知道oracle...
Can we optimise While Loop in sql server for large number of data? Can we pass parameters to the trigger?(Beginner) Can we RAISERROR inside MERGE Statement Can we select Bottom 1000 rows of a database Table from SSMS 2008 R2? Can we set value in a variable inside a select statement ...
mysql存储过程for循环CURSOR #MySQL存储过程中的CURSOR实现循环## 简介 在MySQL中,存储过程是一种可重复使用的数据库对象,可以将一系列SQL语句封装到一个过程中,并通过调用这个过程来执行这些语句。CURSOR是MySQL中用于处理结果集的一种机制,它可以用来遍历结果集中的每一行。本文将重点介绍如何在MySQL存储过程中使用CURS...
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