支持手机号、身份证、姓名、邮箱、银行卡等 PII 数据批量脱敏，生成 Oracle/MySQL/PG 脱敏 SQL
SUBSTR(phone, 1, 3) || '****' || SUBSTR(phone, -4)
CONCAT(LEFT(phone, 3), '****', RIGHT(phone, 4))
overlay(phone placing '****' from 4 for 4)