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The next examples use these values in the PROJECT table:
PROJCODE
1000
945
920
134
•
Add an interval value qualified by YEAR to a datetime value:
SELECT start_date + INTERVAL '1' YEAR
FROM persnl.project
WHERE projcode = 1000;
(EXPR)
----------
1997-04-10
--- 1 row(s) selected.
•
Subtract an interval value qualified by MONTH from a datetime value:
SELECT ship_timestamp - INTERVAL '1' MONTH
FROM persnl.project
WHERE projcode = 134;
(EXPR)
--------------------------
1996-12-01 00:00:00.000000
--- 1 row(s) selected.
The result is 1996-12-01 00:00:00.00. The YEAR value is decremented by 1 because subtracting
a month from January 1 causes the date to be in the previous year.
•
Add a column whose value is an interval qualified by DAY to a datetime value:
SELECT start_date + est_complete
FROM persnl.project
WHERE projcode = 920;
(EXPR)
----------
1996-03-12
--- 1 row(s) selected.
The result of adding 20 days to 1996-02-21 is 1996-03-12. Neoview SQL correctly handles
1996 as a leap year.
•
Subtract an interval value qualified by HOUR TO MINUTE from a datetime value:
SELECT ship_timestamp - INTERVAL '15:30' HOUR TO MINUTE
FROM persnl.project
WHERE projcode = 1000;
(EXPR)
--------------------------
1996-04-20 16:45:00.000000
The result of subtracting 15 hours and 30 minutes from 1996-04-21 08:15:00.00 is 1996-04-20
16:45:00.00.
212
SQL Language Elements
START_DATE
1996-04-10
1996-10-20
1996-02-21
1996-11-20
SHIP_TIMESTAMP
1996-04-21 08:15:00.00
1996-12-21 08:15:00.00
1996-03-12 09:45:00.00
1997-01-01 00:00:00.00
EST_COMPLETE
15
30
20
30
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