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This session of the SQL tutorial series focuses on using the alter table statement to add, delete, and modify columns in an existing table. The syntax to add a column involves using the keywords alter table, followed by the name of the table, add keyword, name of the new column, and assigning a datatype. An example of adding a new column, date of birth, to the existing employee table is provided. The syntax includes using alter table, table name (employee), add keyword, new column name (edob for employee date of birth), and datatype for the new column.