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What can be altered using alter command?
to add a column to existing table.
To rename any existing column.
To change datatype of any column or to modify its size.
To drop a column from the table.
What can be altered using alter command in hive?
You can rename table and column of existing Hive tables.
You can add new column to the table.
Rename Hive table column.
Add or drop table partition.
Add Hadoop archive option to Hive table.
What can be altered using alter command in Hive MCQ?
Create Database Statement.
Hive Show Database.
Drop database.
Creating Hive Tables.
Browse the table.
Altering and Dropping Tables.
Hive Select Data from Table.
Hive Load Data.
Can we change the data type of column in a hive table?
3 Answers. It's simple usually to change/modify the existing table use this syntax in Hive. Here you can change your column name and data type at a time. ... If you want to change ts column to be BIG INT. It means column-type you are changing.
How do I change table name in hive?
ALTER TABLE table_name RENAME TO new_table_name; This statement lets you change the name of a table to a different name. As of version 0.6, a renamed on a managed table moves its HFS location as well. (Older Hive versions just renamed the table in the meta store without moving the HFS location.)
What is Alter command?
Advertisements. The SQL ALTER TABLE command is used to add, delete or modify columns in an existing table. You should also use the ALTER TABLE command to add and drop various constraints on an existing table.
How do you alter in SQL?
ALTER TABLE ADD. ADD is used to add columns into the existing table. ...
ALTER TABLE DROP. DROP COLUMN is used to drop column in a table. ...
Syntax(Oracle, MySQL,MariaDB): ALTER TABLE table_name MODIFY column_name column_type; Syntax(SQL Server): ALTER TABLE table_name ALTER COLUMN column_name column_type;
Which command is used to modify existing rows?
The alter command is used when we want to modify a database or any object contained in the database. The drop command is used to delete databases from MySQL server or objects within a database. The rename command is used to change the name of a table to a new table name.
What is the difference between an insert command and an update command?
Insert is for adding data to the table, update is for updating data that is already in the table. An UPDATE statement can use a WHERE clause but INSERT cannot. Insert is for putting in a fresh record to the table. While the update enables you to modify the inserted record e.g. modifying data type etc.
What is Alter in database?
In SQL 2012 the alter command modifies a database or the file and file groups which are associated with the database. You can add or remove files from as database, changes the attributes of a database or its files and file groups, changes the database collation, and sets database options.
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