“value_columns” specifies the columns which will be updated (using SET). The second element provides the value to be SET in the column specified by “value_columns”.In this case, will spot that the target values are all 1200, and will effect the desired changes using a single UPDATE statement as described above.The dominant factor in the time taken to complete the overall operation tends to be the “admin” work in conveying the application’s intention to the database server rather than the actual updates to the database.A more effective solution to this problem is to attempt to reduce the number of UPDATE statements.What I would like to do is add the $member_id into the form data so I create the record once.Problem is I don't know what is the best way to do this.
*/; BEGIN TRANSACTION; EXEC(@sql); COMMIT TRANSACTION; DECLARE @db sysname DECLARE @sql nvarchar(max) --Modify this query to specify which databases you want.
This is the way I am doing it and it is working but as you will see I have to interact with the database more than once which is not good :/ As you can see I am creating the record to store the data captured from the form but then I am having to read the record back in to update it with the $member_id.
Is there a better, more efficient, way of doing this?
So, given a list of updates to apply we could effect them using the following steps: So in the example above we can reduce five statements to four. But now the number of statements is no longer directly dependent on the number of rows requiring updates.
Even if we wanted to update a thousand rows with different values, we could still do it with four statements.
A requirement arises in many systems to update multiple SQL database rows.