Oracle alter view add column

To Add a column recreate view with the new column in SELECT clause. In this syntax, you separate two columns by a comma. Oracle ALTER TABLE ADD column examples.

Let’s create a table named members for the demonstration. Use CREATE OR REPLACE view , and specify all the columns.

You can alter the constraints on a view using ALTER VIEW. You need to drop and recreate it. Or create a new one alongside and switch to that. To help reduce the time it takes to rebuild the MV, you can drop it, preserving the table.

Then add the column (s) to the base table and the preserved MV table. Clearly it is possible to add a comment to describe a view , but is it possible to add a comment to describe an individual column of a view in oracle ? The database also invalidates any local objects that depend on the view. If you alter a view that is referenced by one or more materialized views , then those materialized views are invalidated.

Invalid materialized views. You can use the existing query and just add column name to that. To add the new column to the view , re-create the view using the CREATE VIEW statement with the OR REPLACE clause. Hi, How to add a new column to specified position in a existing table. I have using the oracle database 10g.

This below code is not working in oracle g example: ALTER TABLE EMPLOYEE ADD DEPT NUMBER FIRST: ALTER TABLE EMPLOYEE ADD DEPT NUMBER AFTER JOB: Please provide the correct syntax. The table must be contained in your schema To alter a table, or you should either have ALTER object privilege for the table or the ALTER ANY TABLE system privilege. The add column function has options for the new column name, the new column data type, the size and scale of the new type, whether or not the new column should allow null values, and whether or not the new column has a default value associated with it. I want to create a view of this table.

Can anybody please help me out from this. I already try to replace this but it had shown some nothing. If the contents of the master tables of a materialized view are modifie the data in the materialized view must be updated to make the materialized view accurately reflect the data currently in its master table(s). To add a column to a table using SQL , we specify that we want to change the table structure via the ALTER TABLE comman followed by the ADD command to tell the RDBMS that we want to add a column. The DBA_UNUSED_COL_TABS view can be used to view the number of unused columns per table.

To physically drop a column you can use one of the following syntaxes, depending on whether you wish to drop a single or multiple columns. Remember, when you drop a table column the column space remains used inside the data blocks and you may want to reorganize the table (using the dbms_redefinition package) to.

To drop a column from a table you can use one of these syntax examples, depending on whether you wish to drop a single column (with drop column ) or multiple columns. The command also allows you to add multiple columns in the one statement. The way to do this is to enclose all of the columns in brackets and separate the columns by a comma. By default, table columns are always visible. When you add a column to a table its value will be null.

So to add a not null constraint first you need to provide a value! The easiest way to do this is with a default: alter table scott. But this means you need to pick a suitable default. Wenn Spalten mithilfe der ALTER TABLE-Anweisung zu einer Tabelle hinzugefügt werden, dann werden diese Spalten automatisch am Ende der Tabelle hinzugefügt.

Using the ALTER TABLE statement to add columns to a table automatically adds those columns to the end of the table. The surcharge_name column has a NOT NULL constraint specified explicitly in the column definition. The amount column can accept NULL values.