Sql loop update

While some of these solutions are workable its not a one size fits all solution. This is an excerpt of the code. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Updating database records in a loop? Ask Question. Asked 12 years, 11 months ago. Active 1 year, 1 month ago. Viewed 72k times. George Stocker Add a comment. Active Oldest Votes. Jeff Atwood Sergio Sergio 7, 10 10 gold badges 45 45 silver badges 77 77 bronze badges.

A possible way that always works even if there is no unique key available is to use the rowid pseudocolumn: begin for i in select rowid, emp. RowId from Renewals as r left join Renewals as p on p.

AccountId and p. RowId , r. RowId from cte as r left join cte as p on p. Improve this answer. SqlZim SqlZim 2, 1 1 gold badge 9 9 silver badges 22 22 bronze badges. Everything but the quirky update ; — Erik Darling. How do I attach an excel file so you can see what the actual output needs to be? I am trying to show that Row 1 above was renewed by row 2 was replaced by row 4 and row4 has not been renewed as yet — Chris Michalczuk.

ChrisMichalczuk That sounds like a different question entirely But you could query the table with a self join like: select r. I don't know if I should laugh or cry.. It's as if nobody ever expected to iterate over data when SQL was designed, so now people are forced to find weird tricks to get it done. Will this work for you? Now just have to do the update in my master table — Chris Michalczuk.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. In the infinite loop AKA endless loop, the condition result will never be false, so the loop never ends and can work forever.

In this scenario, the loop runs endlessly and never ends. Now, we will realize this scenario with the help of the following example. We need to take account of one thing that we should not forget to cancel the execution of the query manually:. In the following flowchart, it is obvious that the value of the variable never changes; therefore, the loop never ends. The reason for this issue is that the variable is always equal to 1 so the condition returns true for each iteration of the loop:.

In this example, we have checked the value of the variable, and when the value is equal or greater than 7, the code entered the IF…ELSE block and executed the BREAK statement, and so it exited the loop immediately. For this reason, the message shows the values of the variable up to 7.

In the following example, we will check whether the variable value is odd or even. In the following example, we will read table data, row by row. Firstly we will create a sample table:.