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。

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

youdao

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。

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

youdao