Btw, you need to be careful while doing anything with existing tables because of the data inside, which presents some challenges while adding new columns or dropping existing ones. You can also add or drop constraints using the ALTER command. It not only allows you to add a column but to drop columns as well. If you know SQL then you probably know that you can add columns to an existing table in SQL Server using the ALTER command. ![]() Also, you cannot add NOT NULL columns into an existing table if they are not empty and you don't have a default value specified. You need to know what data is there, how much data is there, to gauge how long your query is gonna take to complete in production. ![]() Hello guys, adding a new column to an existing table with data is always tricky and if you don't pay enough due diligence then you risk of corrupting or deleting existing data.
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