The following example procedure shows how to create a view on a single
table. The view is built on the INVENTORY_LIST table. The table has six columns,
but the view uses only three of the columns: ITEM_NUMBER, LAST_ORDER_DATE,
and QUANTITY_ON_HAND. The order of the columns in the SELECT clause is the
order in which they appear in the view. The view contains only
the rows for items that were ordered in the last two weeks. The CREATE VIEW
statement looks like this:
- Use the following command to create the view:
CREATE VIEW SAMPLECOLL.RECENT_ORDERS AS
SELECT ITEM_NUMBER, LAST_ORDER_DATE, QUANTITY_ON_HAND
FROM SAMPLECOLL.INVENTORY_LIST
WHERE LAST_ORDER_DATE > CURRENT DATE - 14 DAYS
In
the preceding example, the columns in the view have the same name as the columns
in the table because no column list follows the view name. The schema that
the view is created into does not need to be the same schema as the table
it is built over. Any schema or library can be used.
- Run this statement:
SELECT *FROM SAMPLECOLL.RECENT_ORDERS
The result looks like this:
Display Data
Data width . . . . . . : 26
Position to line . . . . . Shift to column . . . . . .
....+....1....+....2....+.
ITEM LAST QUANTITY
NUMBER ORDER ON
DATE HAND
303476 05/30/94 100
******** End of data ********
Bottom
F3=Exit F12=Cancel F19=Left F20=Right F21=Split
The
only row selected by the view is the row that you updated to have the current
date. All other dates in our table still have the null value so they are not
returned.