Closed yesterday.

I need to calculate the difference of a column between two lines of a table. Is there any way I can do this directly in SQL? I’m using Microsoft SQL Server 2008.

I have a table that stores employee information. This table is used by an external service to determine employee rates per hour. Each employee has a column attribute named EmployeeGroup. Everyone in a specific employee group gets the same rate. A change in EmployeeGroup means that the employee’s rate should change as well. I need to extract only the latest change to the employee’s group, which means we disregard any previous changes. If there are no changes, we also need to return the first instance of the group they belong to. Here is a crude example of the table I am working with (Not all columns present):

This question already has answers here: SQL update query using joins (13 answers) Update statement to update multiple rows (4 answers) Closed 5 days ago. I am trying to add multiple values at once in existing table using query That column with NULL values “County” I want it populated with countries like Kenya, Uganda, Cameroon, […]

/* Update MedMal4 Set Age_Demo = ‘0-18′ Where Age Between 0 AND 18; Update MedMal4 Set Age_Demo = ’18-24′ Where Age Between 18 AND 24; Update MedMal4 Set Age_Demo = ’25-34′ Where Age Between 25 AND 34; Update MedMal4 Set Age_Demo = ’35-44′ Where Age Between 35 AND 44; Update MedMal4 Set Age_Demo = ’45-54’ […]

I am running the belove code and expecting to see 2 affected rows , but what i see is that 3 rows are affected . HOW ?
I keep the exapmle simple :