How do you change a cursor to a while loop?
How to Convert Cursor into While Loop In Sqlserver ?
- — Original Cursor Code — Declare @fk_MedicationOrderId as Bigint. Declare @AdminTime as Bigint.
- — Modified Cursor Code (faster) — Declare @fk_MedicationOrderId as Bigint. Declare @AdminTime as Bigint.
- ——————- What I have done here is to convert “cursor” into “while loop”.
How do you loop through a table in SQL?
Pros and Cons of Using a While Loop to Iterate Through Table Rows in SQL Server
- While loops are faster than cursors.
- While loops use less locks than cursors.
- Less usage of Tempdb: While loops don’t create a copy of data in tempdb as a cursor does.
What is the name of the cursor in the for loop?
The cursor_name is the name of an explicit cursor that is not opened when the loop starts. Note that besides the cursor name, you can use a SELECT statement as shown below: In this case, the cursor FOR LOOP declares, opens, fetches from, and closes an implicit cursor.
When to use a cursor loop or row by row processing?
This should work in most cases. Only if you are dealing with millions of rows is it likely that you will need to embellish this. Even then you should not use a cursor loop and Row-By-Row processing: that is vastly more inefficient.
When does the cursor close in a loop in Java?
If there is no row to fetch, the cursor FOR LOOP closes the cursor. The cursor is also closed if a statement inside the loop transfers control outside the loop, e.g., EXIT and GOTO, or raises an exception. The following illustrates the syntax of the cursor FOR LOOP statement:
How does the Cursor FOR loop statement work in Oracle?
Although your code looks as if it fetched one row at a time, Oracle Database fetches multiple rows at a time and allows you to process each row individually. Let’s look at some examples of using the cursor FOR LOOP statement to see how it works.