T sql iterate through table cursor

In such cases, the only challenge will be to choose a proper exit condition. This article describes various methods that you can use to simulate a cursor -like FETCH-NEXT logic in a stored procedure, trigger, or Transact- SQL batch. Use Transact- SQL Statements to Iterate Through a Result Set There are three methods you can use to iterate through a result set by using Transact- SQL statements.

One method is the use of temp. Ask Question Asked years, months ago. Viewed 612k times 233.

SQL - Iterating through table. Is there anyway to loop through a table variable in T-SQL ? I loop through a set of records from a select? So say for example I have a few records that I wish to loop through and do something with each record. For more information on cursors , also take a look at the free SQL query training provided by Steve Stedman.

Just as a curiosity (since the question states T-SQL ) it is also possible to solve this problem efficiently using SQLCLR. Below is my sql server stored procedure code with cursor. Many T-SQL programmers and DBAs do not know how to successfully loop over records without the need for cursors.

Method 1: Temp table with identity.

Let start by creating a simple cursor that will loop through each row in the employee table. Looping through table records in Sql Server. There are rows in the employee table and so this won’ t illustrate the performance issues that cursors can suffer but if the table contained 10rows the performances issues would be clear.

We use cursors a lot, not for iterating through result sets and performing operations on the data with normal cursors , but for executing business rules. Here is an article some. Defines the attributes of a Transact-SQL server cursor , such as its scrolling behavior and the query used to build the result set on which the cursor operates.

But, since i was asked to do this through sql packages i was wondering if there could be any way of doing this. And i found cursors could loop through the rows of a table , but only if the table returns one column it would be handy. Specifies that positioned updates or deletes made through the cursor do not succeed if the row has been updated since it was read into the cursor.

I created a procedure to calculate the hashcode of a record (complete line of a table ) and then update a column with the calculated hashcode number. T-SQL Programming Part - Processing Sequentially Through a Set of Records By Gregory A. Larsen At some point you will have some business logic that will require you to process sequentially through a set of records one record at a time. The focus of this post is on the fast_forward cursor which is a shorthand way of saying the cursor is forward only and read only.

Is declaring and using a cursor my only option if I wanted to iterate through the rows? Code should be in Standard SQL as much as possible and not local dialect. This is minimal polite behavior on SQL forums.

I want to perform UPDATE row-by-row. So, first you define your cursor that will list all the tables you want to query (let's assume you have all your data tables listed somewhere (system tables or config)). SQL Server does not lock rows as they.