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this part 67 of sequel server tutorial in this video well discuss altering database table columns without dropping the table lets understand this with an example well be using this table TBL employee for this demo notice that this table has got ID name gender and salary columns and I have used this create table script to create that table TBL employee and if you notice the salary column and where care is the data type and this is the sequel script to populate it with some sample data if you need the sequel script I will have it available on my blog and lets say based on this table we want to write a query which is going to list the total salaries of employees grouped by gender so we want the output to be like this so lets write a query for that so select gender and we want sum of salary and lets give it as an Marias total from table TBL employee and we want to group the salaries by gender and keep in mind the salary column data type is envy cap and lets try to execute this and