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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 primary key and foreign key constraints. The essential syntax for this statement includes alter table followed by the name of the table, then add, drop, or alter column depending on the desired action. An example is provided where a new column called email is added to an existing table called customers. Additional examples include adding a column with specified constraints such as not , and the ability to add multiple columns at once separated by commas without the need for parentheses.
