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What can be done using alter?

Contents
  1. What is the use of ALTER?
  2. What can be performed with the ALTER TABLE command?
  3. What can be altered using ALTER command in hive?
  4. What are the way we can use ALTER command in MySQL?
The most commonly used Alter operations are Add, Drop, Modify, change commands for adding, deleting, or changing the contents of the table or column. ALTER command can be used to add columns to an existing table, drop a column from a table, rename an existing column, and change the data type of a column.


What is the use of ALTER?

ALTER TABLE is used to add, delete/drop or modify columns in the existing table. It is also used to add and drop various constraints on the existing table. ADD is used to add columns into the existing table.

What can be performed with the 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.

What can be altered using ALTER command in hive?

In Hive, we can perform modifications in the existing table like changing the table name, column name, comments, and table properties. It provides SQL like commands to alter the table.

What are the way we can use ALTER command in MySQL?

MySQL ALTER statement is used when you want to change the name of your table or any table field. It is also used to add or delete an existing column in a table. The ALTER statement is always used with "ADD", "DROP" and "MODIFY" commands according to the situation.

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