Query recent records with separate date and time fields - sql

Question

I'm working with a table in SAP Advantage with separate date and time fields. I want to find records with a date and time within the last 5 minutes.
This works 99% of the time:
SELECT
*
FROM
table_name
WHERE
TIMESTAMPDIFF(SQL_TSI_DAY, date_field, CURRENT_TIMESTAMP()) < 1
AND
TIMESTAMPDIFF(SQL_TSI_MINUTE, time_field, CURRENT_TIMESTAMP()) < 5
However, this won't work around midnight. For instance, at 12:00AM, any records created at 11:57PM the previous day won't match the filter.
Any idea to do this? Thanks!
Sample image of data. Based on this data, at 7/12/19 at 12:01AM, I'd like to return the last 2 rows.
Created: 7/11/2019 22:54:43
Item EmpNo LastName FirstName date_field time_field
--------------------------------------------------------------------------
1 2 Nelson Roberto 7/11/2019 21:00:00
2 4 Young Bruce 7/11/2019 22:00:00
3 5 Lambert Kim 7/11/2019 23:00:00
4 8 Johnson Leslie 7/11/2019 23:56:00
5 9 Forest Phil 7/12/2019 00:00:00

Answer 1

The easiest way is to recombine the fields and then use TIMESTAMPDIFF():
TRY DROP TABLE #test; CATCH ALL END TRY;
CREATE TABLE #test
(
date_field DATE
, time_field TIME
);
INSERT INTO #test
SELECT '2019-07-11', '21:00:00' FROM system.iota
UNION SELECT '2019-07-11', '22:00:00' FROM system.iota
UNION SELECT '2019-07-11', '23:00:00' FROM system.iota
UNION SELECT '2019-07-11', '23:56:00' FROM system.iota
UNION SELECT '2019-07-12', '00:00:00' FROM system.iota
;
SELECT
TIMESTAMPDIFF(SQL_TSI_MINUTE,
CREATETIMESTAMP(
YEAR(date_field)
, MONTH(date_field)
, DAY(date_field)
, HOUR(time_field)
, MINUTE(time_field)
, SECOND(time_field)
, 0
)
, DATETIME'2019-07-12T00:00:00' -- CURRENT_TIMESTAMP()
)
FROM #test;
Which gives the expected result of:
180
120
4
0
It would be even more trivial if ADS supported an operator or a function to directly combine a date and a time, but I can't find one in the documentation.
So if you integrate that into your original SQL code, it would be:
SELECT
*
FROM
table_name
WHERE
TIMESTAMPDIFF(SQL_TSI_MINUTE,
CREATETIMESTAMP(
YEAR(date_field)
, MONTH(date_field)
, DAY(date_field)
, HOUR(time_field)
, MINUTE(time_field)
, SECOND(time_field)
, 0
)
, CURRENT_TIMESTAMP()
) < 5