The Ultimate Guide to High Availability with MariaDB
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DATEDIFF

Sintassi

DATEDIFF(espr1, espr2)

Spiegazione

DATEDIFF() restituisce (espr1 – espr2) espresso come valore in giorni da una data a un'altra. espr1 e espr2 o valori date o datetime. Per il calcolo, viene usata solo la parte date dei valori.

Examples:

MariaDB [(none)]> SELECT DATEDIFF('2007-12-31 23:59:59','2007-12-30');
+----------------------------------------------+
| DATEDIFF('2007-12-31 23:59:59','2007-12-30') |
+----------------------------------------------+
|                                            1 |
+----------------------------------------------+
1 row in set (0.00 sec)

MariaDB [(none)]> SELECT DATEDIFF('2010-11-30 23:59:59','2010-12-31');
+----------------------------------------------+
| DATEDIFF('2010-11-30 23:59:59','2010-12-31') |
+----------------------------------------------+
|                                          -31 |
+----------------------------------------------+
1 row in set (0.00 sec)

MariaDB [(none)]> 

CREATE TABLE t1 (d DATETIME);
INSERT INTO t1 VALUES
    ("2007-01-30 21:31:07"),
    ("1983-10-15 06:42:51"),
    ("2011-04-21 12:34:56"),
    ("2011-10-30 06:31:41"),
    ("2011-01-30 14:03:25"),
    ("2004-10-07 11:19:34");

MariaDB [test]> SELECT NOW();
+---------------------+
| NOW()               |
+---------------------+
| 2011-05-23 10:56:05 |
+---------------------+
1 row in set (0.00 sec)

MariaDB [test]> select d, DATEDIFF(NOW(),d) from t1;
+---------------------+-------------------+
| d                   | DATEDIFF(NOW(),d) |
+---------------------+-------------------+
| 2007-01-30 21:31:07 |              1574 |
| 1983-10-15 06:42:51 |             10082 |
| 2011-04-21 12:34:56 |                32 |
| 2011-10-30 06:31:41 |              -160 |
| 2011-01-30 14:03:25 |               113 |
| 2004-10-07 11:19:34 |              2419 |
+---------------------+-------------------+
6 rows in set (0.00 sec)
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