mysql> select data, count(*) from soraldo_ele_voti_parziale group by data;
+------------+----------+
| data       | count(*) |
+------------+----------+
| 2009-06-06 |       88 |
| 2009-06-07 |      264 |
| 2013-02-25 |      126 |
| 2013-02-24 |      189 |
| 2004-06-13 |       56 |
| 2014-05-25 |      594 |
| 2010-03-28 |      189 |
| 2010-03-29 |       63 |
| 2014-11-23 |      297 |
| 2011-06-13 |      320 |
| 2009-06-22 |       90 |
| 2003-06-15 |       84 |
| 2003-06-16 |       28 |
| 2016-04-17 |      300 |
| 2001-10-07 |       44 |
| 2006-06-26 |       50 |
| 2016-12-04 |      300 |
| 2018-03-04 |      400 |
| 2014-06-08 |      108 |
| 2019-05-26 |      600 |
| 2019-06-09 |       57 |
| 2020-01-26 |      300 |
| 2020-09-20 |      300 |
| 2020-09-21 |      100 |
| 2022-06-12 |        4 |
+------------+----------+
25 rows in set (0.01 sec)

mysql> select data, count(*) from soraldo_ele_rilaff group by data;
+------------+----------+
| data       | count(*) |
+------------+----------+
| 2013-02-25 |        2 |
| 2009-06-06 |        2 |
| 2009-06-07 |        6 |
| 2013-02-24 |        3 |
| 2014-05-25 |        6 |
| 2004-06-13 |        2 |
| 2010-03-28 |        3 |
| 2010-03-29 |        1 |
| 2014-11-23 |        3 |
| 2003-06-15 |        3 |
| 2009-06-22 |        1 |
| 2011-06-13 |        1 |
| 2003-06-16 |        1 |
| 2016-04-17 |        3 |
| 2006-06-26 |        1 |
| 2001-10-07 |        1 |
| 2016-12-04 |        3 |
| 2008-04-13 |        3 |
| 2008-04-14 |        1 |
| 2018-03-04 |        4 |
| 2014-06-08 |        3 |
| 2019-05-26 |        6 |
| 2019-06-09 |        3 |
| 2020-01-26 |        3 |
| 2020-09-20 |        3 |
| 2020-09-21 |        1 |
| 2022-06-12 |        2 |
+------------+----------+
27 rows in set (0.00 sec)

mysql> update ignore `soraldo_ele_voti_parziale` set data='1900-01-01' WHERE data<'1900-01-01';
Query OK, 0 rows affected (0.01 sec)
Rows matched: 0  Changed: 0  Warnings: 0

mysql> update ignore `soraldo_ele_rilaff` set data='1900-01-01' WHERE data<'1900-01-01';
Query OK, 0 rows affected (0.00 sec)
Rows matched: 0  Changed: 0  Warnings: 0

