Fomu ya DATE_SUB() ya MySQL
Makosa na matumizi
Fomu ya DATE_SUB() inaondoa wakati kwenye tarehe kwa wakati kirefu kwaanayotaka.
Makosa
DATE_SUB(date,INTERVAL expr type)
date Tatizo ni muhimu wa tarehe wa data.expr Tatizo ni wakati wa wakati unaotaka kuongeza.
Tatizo la type linaweza kuwa katika tabia hii:
| Watokeo wa Type |
|---|
| MICROSECOND |
| SECOND |
| MINUTE |
| HOUR |
| DAY |
| WEEK |
| MONTH |
| QUARTER |
| YEAR |
| SECOND_MICROSECOND |
| MINUTE_MICROSECOND |
| MINUTE_SECOND |
| HOUR_MICROSECOND |
| HOUR_SECOND |
| HOUR_MINUTE |
| DAY_MICROSECOND |
| DAY_SECOND |
| DAY_MINUTE |
| DAY_HOUR |
| YEAR_MONTH |
Mbinu
Wakati tunatoka kwenye tabia hii:
| OrderId | ProductName | OrderDate |
|---|---|---|
| 1 | 'Computer' | 2008-12-29 16:25:46.635 |
Sasa, tunataka kusifua 2 siku kwenye "OrderDate".
Tunatumia maelezo ya SELECT inayotawala hapa:
SELECT OrderId,DATE_SUB(OrderDate,INTERVAL 2 DAY) AS OrderPayDate FROM Orders
Matokeo:
| OrderId | OrderPayDate |
|---|---|
| 1 | 2008-12-27 16:25:46.635 |
