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the SQL alter table statement allows you to add remove and modify columns in an existing table it also lets you add a primary key and foreign key constraints the essential syntax of the alter table statement is shown here the key words alter table are followed by the name of the table that will be changed then either add drop column or alter column depending on what you want to do heres an example of the alter table statement that adds a new column to an existing table called customers when this statement is executed a new variable length character column called email will be added to the table this example adds a new variable length character column called postcode it also specifies that it may not be left blank when records are input notice the use of not null this example adds more than one column at a time to an existing table notice how the new column specifications are separated by commas and that theres no need for parentheses in this statement other than those used for the d
