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  1. www.w3schools.com › SQl › sql_alterSQL ALTER TABLE Statement - W3Schools

    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. ALTER TABLE - ADD Column. To add a column in a table, use the following syntax: ALTER TABLE table_name. ADD column_name datatype;

    • Try It Yourself

      ALTER TABLE Customers ADD Email varchar (255); Edit the SQL...

    • Exercise

      SQL Group By . Exercise 1 Exercise 2 Go to SQL Group By...

  2. www.geeksforgeeks.org › modifying-existing-data-in-sqlHow to Modify Existing Data in SQL? - GeeksforGeeks

    Aug 29, 2024 · 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.

  3. www.geeksforgeeks.org › sql-alter-add-drop-modifySQL ALTER TABLE - GeeksforGeeks

    May 26, 2024 · SQL ALTER TABLE command can add, delete, or modify columns of an existing table. This article discusses the SQL ALTER TABLE statement with examples and syntax.

    • 6 min

  4. www.sqltutorial.org › sql-alter-tableThe Essential Guide to SQL ALTER TABLE Statement - SQL Tutorial

    To modify the structure of a table, you use the ALTER TABLE statement. The ALTER TABLE statement allows you to perform the following operations on an existing table: Add a new column using the ADD clause. Modify attribute of a column such as constraint, default value, etc. using the MODIFY clause. Remove columns using the DROP clause.

  5. www.programiz.com › sql › alter-tableSQL ALTER TABLE Statement (With Examples) - Programiz

    • ALTER TABLE Syntax. The syntax of the SQL ALTER TABLE statement is: ALTER TABLE table_name clause supporting_codes; Here, table_name is the name of the table to be modified.
    • ALTER TABLE Operations. We can perform the following operations on a table using the ALTER TABLE command: Add a column. Rename a column. Modify a column. Delete a column.
    • Add Column in a Table. We can add columns in a table using the ALTER TABLE command with the ADD clause. For example, -- add phone column to Customers table ALTER TABLE Customers ADD phone varchar(10);
    • Add Multiple Columns in a Table. We can also add multiple columns at once to a table. For example, -- add phone and age columns to Customers table ALTER TABLE Customers ADD phone varchar(10), age int;

  6. www.w3schools.in › sql › alter-tableHow to Use the ALTER TABLE Statement in SQL - W3Schools

    Learn how the ALTER TABLE statement in SQL streamlines your database management by simplifying modifications to a table's structure without affecting its data. This feature allows easy modification of table columns, constraints, and indexes.

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  8. www.tutorialsteacher.com › sql › sql-alter-tableSQL ALTER TABLE Statement - TutorialsTeacher.com

    ALTER command is a DDL command to modify the structure of an existing tables in the database by altering, adding, or dropping columns and constraints. You can add columns, rename columns, delete columns, or change the data type of columns using the ALTER command.