last count, MySQL - rextester

last count

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Id
Datetime_Scan
Count
@last_count
Delta
@last_count := Count

1
2
06.04.2017 00:00:00
302
0
0
302

2
10
07.04.2017 00:00:00
391
302
89
391

3
18
08.04.2017 00:00:00
500
391
109
500

4
26
09.04.2017 00:00:00
605
500
105
605

5
34
10.04.2017 00:00:00
725
605
120
725

6
42
11.04.2017 00:00:00
832
725
107
832

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