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30 Σεπ 2012 · You cannot use ALTER VIEW for removing a column. To recreate the view without the column, use CREATE OR REPLACE VIEW. From the Oracle documentation: Use the ALTER VIEW statement to explicitly recompile a view that is invalid or to modify view constraints. Source: Oracle® Database SQL Language Reference 11g Release 2 (11.2) E26088-01
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:
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:
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.
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.
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.
The Oracle ALTER TABLE statement is used to add, modify, or drop/delete columns in a table. The Oracle ALTER TABLE statement is also used to rename a table. Add column in table. Syntax. To ADD A COLUMN in a table, the Oracle ALTER TABLE syntax is: ALTER TABLE table_name. ADD column_name column_definition; Example.
