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

    Learn how to use the ALTER TABLE statement to add, delete, or modify columns in an existing table. See examples of changing data types, renaming columns, and dropping columns in different database systems.

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  3. www.sqlservertutorial.net › sql-server-basics › sqlSQL Server ALTER TABLE ALTER COLUMN - SQL Server Tutorial

    SQL Server allows you to perform the following changes to an existing column of a table: Modify the data type. Change the size. Add a NOT NULL constraint. Modify column’s data type. To modify the data type of a column, you use the following statement: ALTER TABLE table_name . ALTER COLUMN column_name new_data_type(size);

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  5. dev.mysql.com › doc › refmanMySQL :: MySQL 8.4 Reference Manual :: 15.1.9 ALTER TABLE ...

    ALTER TABLE changes the structure of a table. For example, you can add or delete columns, create or destroy indexes, change the type of existing columns, or rename columns or the table itself. You can also change characteristics such as the storage engine used for the table or the table comment.

  6. www.techonthenet.com › sql › tablesSQL: ALTER TABLE Statement - TechOnTheNet

    To modify a column in an existing table, the SQL ALTER TABLE syntax is: For Oracle, MySQL, MariaDB: ALTER TABLE table_name. MODIFY column_name column_type; For SQL Server: ALTER TABLE table_name.

  7. www.mssqltips.com › sqlservertip › 7398SQL ALTER TABLE to Add, Delete and Change Columns in a Table

    Sep 19, 2022 · Learn how to use SQL ALTER TABLE syntax to modify the structure of a table in SQL Server. See examples of adding, deleting and renaming columns, and how to rebuild the table to reclaim space.

  8. learn.microsoft.com › en-us › sqlALTER TABLE (Transact-SQL) - SQL Server | Microsoft Learn

    Learn how to modify a table definition by altering, adding, or dropping columns and constraints with ALTER TABLE statement. See syntax and examples for disk-based and memory-optimized tables.

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

    Learn how to use the SQL ALTER TABLE statement to modify the structure of existing tables in the database. See examples of adding, modifying, and dropping columns using the ADD, MODIFY, and DROP clauses.