Now, if you didn't know the order of serial numbers of the columns or you don't know the exact serial number of the column, then you may have to use some other trick to achieve your goal. If you have some other way of identifying the serial numbers of the columns, then you may proceed to the next section.
I have a T-SQL query that is returning the appropriate data and the results are saved into a text file. I have a.csv file that has the same number of lines as the text file, but there is a header in the.csv file and the text file does not.
But what happens if the serial number is not unique? I had to look at the documentation to see how the row_number() function behaves when the serial number is not unique. The documentation states that it will only work if you start at 1.
I used the function row_number() to generate a unique row number for each row in the table. The first thing I noticed was that the last four digits of the serial number were wrong. So I made a change that will make the serial number unique.
But I decided to go the other way. If we go back to the data and change the serial number to be unique for each row, then we can add the new value of the serial number to the existing values and generate a new set of numbers. This process is called a rollback.
The second thing I noticed was that the company name was entered incorrectly. I am not sure how, but whoever did the change must have entered the company name incorrectly. But rather than going back and changing all of the affected records, I found a replacement for the company name.
The documentation also states that the rows are returned in the order of the ascending index, which is the serial number. That was true in my case, but in some cases this may not be true.
mysql> UPDATE powerdns_domains SET serialnum = (SELECT MAX(serialnum) FROM powerdns_domains) WHERE serialnum < (select serialnum from powerdns_users where username ='myUser');
This example will change the serial of all users who already registered and the global maximum, the current maximum and the new value. 827ec27edc