ALTER VIEW statement

The ALTER VIEW statement defines changes to be made to an existing view definition.

ALTER VIEW viewOwner ₁ .viewName ₁

This option specifies the fully qualified name of the view to be modified.

QUALIFIED

This option indicates whether the view was created with a qualified name.

QUALIFIED parameter values

Value	Description
YES	Indicates that the view was created with a qualified name.
NO	Indicates that the view was not created with a qualified name.

OWNER viewOwner ₂

This option specifies the new owner of the view.

NAME viewName ₂

This option specifies the new name of the view.

CHECK OPTION

This option specifies the new check option for the view. Views that reference global temporary tables cannot specify CHECK OPTION.

CHECK OPTION parameter values

Value	Description
LOCAL	Specifies that all search conditions are checked conditionally.
YES	Specifies that all search conditions are checked, regardless of the check options specified. CHECK OPTION YES creates a cascaded view.
NO	Specifies not to use the definition of the view to check operations that use the view.

COMMENT 'string'

This option defines a comment for the view.

NOCOMMENT

This option removes an existing comment.

LABEL 'string'

This option defines a label for the view.

NOLABEL

This option removes an existing label.

COLCOMMENT columnName 'string'

This option defines a comment 'string' on columnName.

NOCOLCOMMENT columnName

This option removes an existing column comment from columnName.

COLLABEL columnName 'string'

This option defines a label 'string' on columnName.

NOCOLLABEL columnName

This option removes an existing column label from columnName.

COLUMNS (columnName, ...)

This option specifies the names of the columns to be included in the view.

Note

The COLUMNS parameter is used when the view does not contain an explicit column list. The ALTER COLUMN, ADD COLUMN, and DROP COLUMN parameters are used when the view contains an explicit column list.

NOCOLUMNS

This option removes the column list from the view definition. Columns appear in the order that is specified in the SELECT clause.

ALTER COLUMN columnName ₁ (NAME columnName ₂)

This option specifies a new name for a column.

Note

The ALTER COLUMN parameter is used when the view contains an explicit column list. The COLUMNS statement is used when the view does not contain an explicit column list.

ALTER COLUMN columnName ₁ (MOVE BEFORE columnName ₃)

Moves a column before another column.

Note

The ALTER COLUMN parameter is used when the view contains an explicit column list. The COLUMNS statement is used when the view does not contain an explicit column list.

ALTER COLUMN columnName ₁ (MOVE AFTER columnName ₃)

Moves a column after another column.

Note

The ALTER COLUMN parameter is used when the view contains an explicit column list. The COLUMNS statement is used when the view does not contain an explicit column list.

ADD COLUMN columnName ₁ BEFORE columnName ₂

This option adds a new column before another column.

Note

The ADD COLUMN parameter is used when the view contains an explicit column list. The COLUMNS parameter is used when the view does not contain an explicit column list.

ADD COLUMN columnName ₁ AFTER columnName ₂

This option adds a new column after another column.

Note

The ADD COLUMN parameter is used when the view contains an explicit column list. The COLUMNS parameter is used when the view does not contain an explicit column list.

DROP COLUMN columnName

This option removes a column.

Note

The DROP COLUMN parameter is used when the view contains an explicit column list. The COLUMNS parameter is used when the view does not contain an explicit column list.

PATH (schemaList)

This option specifies the path for this view.

AS SELECT subselect

This option defines a new SQL subselect statement as the definition for the view. If specified, the new select statement must appear last in the ALTER VIEW statement, after any other clauses.

ALTER VIEW statement

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