diff --git a/git/gitFreqCommand.sh b/git/gitFreqCommand.sh
index 05925f7..fe6e6b8 100644
--- a/git/gitFreqCommand.sh
+++ b/git/gitFreqCommand.sh
@@ -26,6 +26,7 @@ git commit -m "Initial commit"
 ## 删除远程分支
 git push origin :<branch_name>            # v1.5+
 git push origin --delete <branch_name>    # v1.7+
+git branch --delete dev # 删除本地分支
 
 ## 与远端关联
 git remote add origin <remote-git-url>
diff --git a/shell/powershell.sh b/shell/powershell.sh
new file mode 100644
index 0000000..56eb2c9
--- /dev/null
+++ b/shell/powershell.sh
@@ -0,0 +1,6 @@
+# 查看端口占用情况
+netstat -ano
+netstat -aon|findstr "2008"
+
+# 查看指定 PID 的进程
+tasklist|findstr "8912"
diff --git a/sql/sql_examples.sql b/sql/sql_examples.sql
index c85cc21..a0fb4ae 100644
--- a/sql/sql_examples.sql
+++ b/sql/sql_examples.sql
@@ -21,6 +21,10 @@ insert into temp values("gr", 108333, "goooogle");
 # 查询表中某个字段(eleName)是否重复行
 select * from <table-name> where a="avalue" group by `eleName` having count(eleName)<>1
 
+# 按app进行分组统计金额
+SELECT app as 平台, sum(total_amount) as 金额 FROM order WHERE uid=2216620 and state='PAYED' GROUP BY app;
+
+
 # 查询某个字段不重复的记录
 select distinct domainKey from MetaInfo;