from_base64
description
Syntax
VARCHAR from_base64(VARCHAR str)
返回对输入的字符串进行Base64解码后的结果，当输入字符串不正确时（出现非Base64编码后可能出现的字符）将会返回NULL
example
mysql> select from_base64('MQ==');
+---------------------+
| from_base64('MQ==') |
+---------------------+
| 1 |
+---------------------+
mysql> select from_base64('MjM0');
+---------------------+
| from_base64('MjM0') |
+---------------------+
| 234 |
+---------------------+keywords
from_base64