Update query using Subquery in Sql Server

Question

I have a simple table Structure like this:

Table tempData

╔══════════╦═══════╗
║   NAME   ║ MARKS ║
╠══════════╬═══         


        

Answer 1

The title of this thread asks how a subquery can be used in an update. Here's an example of that:

update [dbName].[dbo].[MyTable] 
set MyColumn = 1 
where 
    (
        select count(*) 
        from [dbName].[dbo].[MyTable] mt2 
        where
            mt2.ID > [dbName].[dbo].[MyTable].ID
            and mt2.Category = [dbName].[dbo].[MyTable].Category
    ) > 0