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SELECT 1
| id | fromdate | todate |
|---|---|---|
| 1 | 2014-04-01 08:00:00 | 2014-04-02 00:00:00 |
| 1 | 2014-04-02 00:00:00 | 2014-04-03 00:00:00 |
| 1 | 2014-04-03 00:00:00 | 2014-04-04 00:00:00 |
| 1 | 2014-04-04 00:00:00 | 2014-04-04 12:00:00 |
SELECT 4