Contributing

How do I drop a column in a view?

Standard

How do I drop a column in a view?

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.

Can you ALTER VIEW in PostgreSQL?

ALTER VIEW changes various auxiliary properties of a view. (If you want to modify the view’s defining query, use CREATE OR REPLACE VIEW .) You must own the view to use ALTER VIEW . To change a view’s schema, you must also have CREATE privilege on the new schema.

Can we drop column using alter?

Syntax. The syntax to drop a column in a table in MySQL (using the ALTER TABLE statement) is: ALTER TABLE table_name DROP COLUMN column_name; table_name.

How do I drop a column in PostgreSQL?

The syntax to drop a column in a table in PostgreSQL (using the ALTER TABLE statement) is: ALTER TABLE table_name DROP COLUMN column_name; table_name.

How do you drop a column?

In MySQL, the syntax for ALTER TABLE Drop Column is,

  1. ALTER TABLE “table_name” DROP “column_name”;
  2. ALTER TABLE “table_name” DROP COLUMN “column_name”;
  3. ALTER TABLE Customer DROP Birth_Date;
  4. ALTER TABLE Customer DROP COLUMN Birth_Date;
  5. ALTER TABLE Customer DROP COLUMN Birth_Date;

How do I edit a view?

To modify a view

  1. In Object Explorer, click the plus sign next to the database where your view is located and then click the plus sign next to the Views folder.
  2. Right-click on the view you wish to modify and select Design.

Can we add a column to a view in PostgreSQL?

You can do from pgAdmin by right-clicking on the view and select CREATE SCRIPT uncomment: DROP VIEW ; and edit the CREATE VIEW to drop the column. However if the view is used in other views you have to drop them all and recreate in sequence.

Can we drop a column?

SQL allows a user to remove one or more columns from a given table in the database if they are no longer needed or become redundant. To do so, the user must have ALTER permission on the object. Let’s begin with the syntax for using the ALTER TABLE DROP COLUMN statement.

How do I drop a row in PostgreSQL?

The PostgreSQL DELETE statement allows you to delete one or more rows from a table. In this syntax: First, specify the name of the table from which you want to delete data after the DELETE FROM keywords. Second, use a condition in the WHERE clause to specify which rows from the table to delete.

How do you delete a column from a table?

Right-click the column you want to delete and choose Delete Column from the shortcut menu. If the column participates in a relationship (FOREIGN KEY or PRIMARY KEY), a message prompts you to confirm the deletion of the selected columns and their relationships. Choose Yes.

How do I drop a specific column in SQL?

SQL Server has ALTER TABLE DROP COLUMN command for removing columns from an existing table. We can use the below syntax to do this: ALTER TABLE table_name….Transact-SQL

  1. ALTER TABLE table_name.
  2. DROP COLUMN.
  3. column_name1,
  4. column_name2,
  5. …,
  6. column_name_n;