Can you ALTER a table with data in it?

Can you modify the structure of an existing table How?

The SQL ALTER TABLE command is used to change the structure of an existing table. It helps to add or delete columns, create or destroy indexes, change the type of existing columns, or rename columns or the table itself. It can also be used to change the comment for the table and type of the table.

What Cannot be performed with ALTER TABLE command?

- Column can't be deleted with alter command. - Column can't be renamed a column. - Column can't be added in between of the existing columns.

How do I add values to an existing table?

INSERT INTO Syntax It is possible to write the INSERT INTO statement in two ways: 1. Specify both the column names and the values to be inserted: INSERT INTO table_name (column1, column2, column3, ...)

How do you modify a table in SQL?

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.