Web Reference: The ALTER TABLE statement is used to add, delete, or modify columns in an existing table. The ALTER TABLE statement is also used to add and drop various constraints on an existing table. In SQL, altering a table means changing its structure after it’s been created. This could involve adding or removing columns, modifying data types, renaming elements, or adjusting constraints like primary keys or foreign keys. Aug 6, 2025 · The UPDATE command is used to change the values of existing records in a table, enabling us to correct or update data as needed. On the other hand, the ALTER TABLE command is used to modify the structure of a table itself, such as adding or removing columns and changing data types.
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