I need to write a query in SQL Server.
In SQL Server, I have a table named x. This table has several columns, such as FrameLossCount, ElementID1, Date, and others. Now, I want to add two additional columns named LastDateStatus and Intensification. Neither of these columns should allow null values.
The LastDateStatus column should only contain the values “Normal” and “Alarm”. It should be populated as follows: For each ElementID1, if the FrameLossCount exceeds 50,000 on the latest recorded date (determined by time, not the order of rows in the table), the column should be populated with “Alarm”. Otherwise, it should be populated with “Normal”.
The Intensification column should check the FrameLossCount for each ElementID1 on the latest recorded date. If the FrameLossCount exceeds 50,000 on that date, it should also check the FrameLossCount for the preceding two days. If the FrameLossCount exceeded 50,000 on all three consecutive days (including the latest date), the Intensification column should be populated with “Critical”. Otherwise, it should be populated with “Normal”.