默认用法不太一样了
像下面使用:
mysql> SELECT CHAR(97 using utf8mb4);
+------------------------+
| CHAR(97 using utf8mb4) |
+------------------------+
| a |
+------------------------+
1 row in set (0.00 sec)
mysql> SELECT CHAR(97 using ascii);
+----------------------+
| CHAR(97 using ascii) |
+----------------------+
| a |
+----------------------+
1 row in set (0.01 sec)