redshift alter column add alter col code example

Example: alter table add column redshift

ALTER TABLE table_name 
{
ADD table_constraint 
| DROP CONSTRAINT constraint_name [ RESTRICT | CASCADE ] 
| OWNER TO new_owner 
| RENAME TO new_name 
| RENAME COLUMN column_name TO new_name            
| ALTER COLUMN column_name TYPE new_data_type
| ALTER COLUMN column_name ENCODE new_encode_type            
| ALTER DISTKEY column_name 
| ALTER DISTSTYLE ALL       
| ALTER DISTSTYLE EVEN
| ALTER DISTSTYLE KEY DISTKEY column_name 
| ALTER DISTSTYLE AUTO             
| ALTER [COMPOUND] SORTKEY ( column_name [,...] ) 
| ALTER SORTKEY AUTO 
| ALTER SORTKEY NONE
| ADD [ COLUMN ] column_name column_type
  [ DEFAULT default_expr ]
  [ ENCODE encoding ]
  [ NOT NULL | NULL ] |
| DROP [ COLUMN ] column_name [ RESTRICT | CASCADE ] }

where table_constraint is:

[ CONSTRAINT constraint_name ]
{ UNIQUE ( column_name [, ... ] )  
| PRIMARY KEY ( column_name [, ... ] ) 
| FOREIGN KEY (column_name [, ... ] )
   REFERENCES  reftable [ ( refcolumn ) ]}

The following options apply only to external tables:

SET LOCATION { 's3://bucket/folder/' | 's3://bucket/manifest_file' } 
| SET FILE FORMAT format |
| SET TABLE PROPERTIES ('property_name'='property_value') 
| PARTITION ( partition_column=partition_value [, ...] ) 
  SET LOCATION { 's3://bucket/folder' |'s3://bucket/manifest_file' } 
| ADD [IF NOT EXISTS] 
    PARTITION ( partition_column=partition_value [, ...] ) LOCATION { 's3://bucket/folder' |'s3://bucket/manifest_file' }
    [, ... ]
| DROP PARTITION ( partition_column=partition_value [, ...] )