[
http://issues.apache.org/jira/browse/DERBY-396?page=comments#action_12318968 ]
Kumar Matcha commented on DERBY-396:
------------------------------------
Derby is supposed to be SQL-92E compliance and supports key features in the
SQL-99 standards. If you take a look at the SQL92 Standard for ALTER TABLE
STATEMENT :
<alter table statement> ::=
ALTER TABLE <table name> <alter table action>
<alter table action> ::=
<add column definition>
| <alter column definition>
| <drop column definition>
| <add table constraint definition>
| <drop table constraint definition>
So its supposed to provide support for dropping a column. Although RENAME
COLUMN is vendor specific, Oracle/Postgres aggrement is a good enough standard.
> Support for ALTER STATEMENT to DROP , MODIFY, RENAME a COLUMN
> --------------------------------------------------------------
>
> Key: DERBY-396
> URL: http://issues.apache.org/jira/browse/DERBY-396
> Project: Derby
> Type: New Feature
> Components: SQL
> Environment: LINUX
> Reporter: Kumar Matcha
> Priority: Blocker
>
> Alter Statement should support dropping a column, modifying a column to a
> different data type , rename a column.
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