Can we ALTER a table with data?

Question

Existing tables can be altered with an ALTER TABLE statement. An ALTER TABLE statement is part of DDL, and is for altering a table schema only; we'll look at updating data in a table later in this book.

How do you alter data in a table?

To change the data type of a column in a table, use the following syntax:1SQL Server / MS Access: ALTER TABLE table_name. ALTER COLUMN column_name datatype;2My SQL / Oracle (prior version 10G): ALTER TABLE table_name. MODIFY COLUMN column_name datatype;3Oracle 10G and later: ALTER TABLE table_name.SQL ALTER TABLE Statement - W3Schools

Can we ALTER TABLE with data in SQL Server?

You can modify the data type of a column in SQL Server by using SQL Server Management Studio or Transact-SQL. Modifying the data type of a column that already contains data can result in the permanent loss of data when the existing data is converted to the new type.

Can we alter a table with data in Teradata?

ALTER TABLE command is used to add or drop columns from an existing table. You can also use ALTER TABLE command to modify the attributes of the existing columns.

How do I edit a table without losing data?

There are some good fixes for this issue:1Set a default value (recommended) for the column you're creating.2Create the column without the NOT NULL , set the appropiate values, and then make the column NOT NULL .How to alter MySQL table without losing data? - Stack Overflow

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