How do I change an existing table?

How do you make changes to an existing table?

The basic syntax to add a column in a table is shown below. ALTER TABLE table_name ADD column_name data_type constraints; The mentioned statement will add a new column in the shipper's table. ALTER TABLE shippers ADD fax VARCHAR (20);

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

Which changes the definition of an existing table?

You can change the definition of a table by adding a new column, changing an existing column definition such as its length or default value, dropping an existing column, adding or removing constraints, changing partitioning for the table, or altering one of many other options.

Can you select into an existing table?

The INSERT INTO SELECT statement copies data from one table and inserts it into another table. The INSERT INTO SELECT statement requires that the data types in source and target tables match. Note: The existing records in the target table are unaffected.