The field had better want to use acquiescent value, unless those are automatic growth or advocate key external key.

字段最好都要采用默认值，除非那些自动增长型或主键 外键。

youdao

So, if do not use acquiescent value, will add relevant judgement statement, the length of the program increases 60 possibly.

那么，如果不采用默认值，则将要增加相应的判断语句，程序的长度就可能增加60行。

youdao

Character type is acquiescent empty string, numerical value acquiescent 0, date acquiesce is systematic date.

字符类型都默认空字符串，数值型都默认0，日期型默认为系统日期。

youdao