Sr New :
+------+------+--------------------+--------------------+----------+
| SEQ | ID |instamp |outstamp | duration |
+------+------+--------------------+--------------------+----------+
| 2516 | 1 |2020-02-22 14:22:47 |2020-02-22 14:24:06 | NULL |
| 2517 | 1 |2020-02-22 14:24:08 |2020-02-22 14:24:27 | NULL |
| 2518 | 1 |2020-02-22 14:24:28 |2020-02-22 14:24:47 | NULL |
| 2519 | 1 |2020-02-22 14:24:48 |2020-02-22 14:25:06 | NULL |
| 2520 | 1 |2020-02-22 14:25:08 |2020-02-24 23:14:00 | NULL |
I am trying to update the last duration parameter. if I do
"mysql> SELECT TIMESTAMPDIFF(MINUTE,outTimestamp,intimestamp) from sTable;
This is working. but I am not able to update the last column.
I tried
update sTable rt set duration = (select TIMESTAMPDIFF(MINUTE, outstamp,instamp) from sTable rt1 where rt1.outstamp is not null and rt.seq = rt1.seq) ;
This is giving an error. can you please let me know if I am missing anything.
nbk :
You Update clause it not correct. It must be
UPDATE sTable rt SET duration = TIMESTAMPDIFF(MINUTE, outstamp,instamp)
WHERE rt.outstamp IS NOT nulL;
CREATE TABLE sTable ( `SEQ` INTEGER, `ID` INTEGER, `instamp` datetime, `outstamp` datetime, `duration` INTEGER );
✓
INSERT INTO sTable (`SEQ`, `ID`, `instamp`, `outstamp`, `duration`) VALUES ('2516', '1', '2020-02-22 14:22:47', '2020-02-22 14:24:06', NULL), ('2517', '1', '2020-02-22 14:24:08', '2020-02-22 14:24:27', NULL), ('2518', '1', '2020-02-22 14:24:28', '2020-02-22 14:24:47', NULL), ('2519', '1', '2020-02-22 14:24:48', '2020-02-22 14:25:06', NULL), ('2520', '1', '2020-02-22 14:25:08', '2020-02-24 23:14:00', NULL);
✓
SELECT TIMESTAMPDIFF(MINUTE,outstamp,instamp) from sTable;
| TIMESTAMPDIFF(MINUTE,outstamp,instamp) | | -------------------------------------: | | -1 | | 0 | | 0 | | 0 | | -3408 |
update sTable rt set duration = TIMESTAMPDIFF(MINUTE, outstamp,instamp) where rt.outstamp is not null ;
✓
SELECT * FROM sTable;
SEQ | ID | instamp | outstamp | duration ---: | -: | :------------------ | :------------------ | -------: 2516 | 1 | 2020-02-22 14:22:47 | 2020-02-22 14:24:06 | -1 2517 | 1 | 2020-02-22 14:24:08 | 2020-02-22 14:24:27 | 0 2518 | 1 | 2020-02-22 14:24:28 | 2020-02-22 14:24:47 | 0 2519 | 1 | 2020-02-22 14:24:48 | 2020-02-22 14:25:06 | 0 2520 | 1 | 2020-02-22 14:25:08 | 2020-02-24 23:14:00 | -3408
db<>fiddle here