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+# 1. 功能介绍
+如果要对SQL做各种统计，通常需要对SQL进行参数化再做统计。比如：
+```sql
+// 原始SQL
+select * from t where id = 1
+select * from t where id = 2
+
+// 参数化SQL
+select * from t where id = ?
+```