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Oracle Drop Column using DROP COLUMN clause. To drop a column from a table physically, you use the following statement: ALTER TABLE table_name DROP COLUMN column_name; Code language: SQL (Structured Query Language) (sql) To drop multiple columns, you use the statement below:
- DROP TABLE
Summary: in this tutorial, you will learn how to use the...
- DROP TABLE
The DROP COLUMN command is used to delete a column in an existing table. The following SQL deletes the "ContactName" column from the "Customers" table:
20 Δεκ 2012 · Use ALTER TABLE with DROP COLUMN to drop a column from a table, and CHANGE or MODIFY to change a column. ALTER TABLE tbl_Country DROP COLUMN IsDeleted; ALTER TABLE tbl_Country MODIFY IsDeleted tinyint(1) NOT NULL; ALTER TABLE tbl_Country CHANGE IsDeleted IsDeleted tinyint(1) NOT NULL;
To do so, you use the ALTER TABLE as follows: ALTER TABLE table_name. DROP COLUMN column_name1, [DROP COLUMN column_name2]; Code language: SQL (Structured Query Language) (sql) In this syntax: table_name is the name of the table which contains the columns that you are removing. column_name1, column_name2 are the columns that you are dropping.
alter table table_name drop column column_name; alter table table_name drop (column_name1, column_name2); Dropping a column from a table will cause all unused columns in that table to be dropped at the same time.
In such cases, you use the following ALTER TABLE DROP COLUMN statement: ALTER TABLE table_name. DROP COLUMN column_name; Code language: SQL (Structured Query Language) (sql) In this syntax: First, specify the name of the table that contains the column which you want to drop after the ALTER TABLE keywords.
26 Ιουν 2023 · Oracle ALTER TABLE DROP Column By Examples. Schema Object. June 26, 2023. by Ed Chen. The syntax of dropping a column is pretty easy. SQL> show user. USER is "HR". SQL> alter table employees drop column salary; Table altered.
