Mssql cursor sample

Beschreibt die Attribute eines Cursors , z. Vorwärtscursor oder einen Scrollcursor handelt. First, declare two variables to hold product name and list price, and a cursor to hold the result of a query that selects product name and list price from the production. Sometimes cursors are fine – like for one-time utility code or database maintenance routines – but if you find yourself writing cursors as part of a transactional operation, it’s time to think about set-based operations instead.

SQL Server cursor example. In the example below we will loop through the contents of a table and select the description of each ID we find. DeutschlandsBesteJobportale.

Ask Question Asked years, months ago. Active year, months ago. Viewed 113k times 68. For an example , check out this Stack Overflow answer on converting a cursor to set-based operation. In these types of problems, the cursor gives very poor performance as it processes through each and every column.

On the other hand using joins in those conditions is feasible because it processes only those columns which meet the condition. So here joins are faster than cursors. The following example explains the replacement of cursors through.

Secon you are not selecting your inner Cursor into anything. And I cannot think of any circumstance where you would select all fields in this way - spell them out! Folder has a primary key of ClientID that is also a foreign key for Attend.

Using FETCH in a simple cursor. Person table with a last name that starts with B, and uses FETCH NEXT to step through the rows. The FETCH statements return the value for the column specified in DECLARE CURSOR as a single-row result set. Try and avoid Cursors.

As for your question, Yes it will work but you will end-up with multiple result-sets. Declare a Table Variable and insert into that table variable and select from the table variable after the loop ends. What is a Database Cursor ? After reading this article you will understand what a database cursor is, see an example , and understand when to use them in a stored procedure. Name (nvarchar(max)) NoofUses (int) Coupo. Database Cursors have long been a favorite of mine.

I have two tables in my database. It allows you to take a subset of data and output the information in various ways. You can return output to build a cleaner report output, etc. For example , a cursor is ideal for row by row processing that can’t be accomplished by set based operations.

A cursor is flexible in that it provides a window, or subset, of data and that allows manipulation of the data in various ways. Study carefully what you want to achieve on case by case basis before using a cursor. Bewerber empfehlen Jobvector.