docs: 更新 readme.md

doc/readme.md

@@ -19,13 +19,19 @@ Richr00t#
 ## 统计各小时数据
 
 ```sql
-select
-	rpt_time,
-	count(*)
-from
-	tsfx.dw_sa_omc_ci_h
-group by
-	rpt_time
-order by
-	rpt_time desc
-```
+select rpt_time,
+       count(1)
+from tsfx.dw_sa_omc_ci_h
+group by rpt_time
+order by rpt_time desc;
+```
+
+## 检查重复数据
+```sql
+select nci,
+       count(1)
+from tsfx.dw_sa_omc_ci_h
+where rpt_time = '2022-12-25 19:00:00'
+group by nci
+having count(1) > 1;
+```