[数据库] 不知道全国有多少数据系统被 Oracle 数据库的 VARCHAR2(X) 的默认单位给坑了
当我们建表时，使用 VARCHAR2(50)，从开发的角度，可能会认为是 VARCHAR2(50 个字符)，而不是 VARCHAR2(50 字节)。 但 Oracle 数据库，如果你没写清楚 VARCHAR2(50 CHAR) 还是 VARCHAR2(50 BYTE)，而只是写了
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