Create tdengine资料.md

Author: zjfsdnu

tdengine资料.md

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+```
+sudo systemctl start taosd
+sudo systemctl status taosd
+● taosd.service - TDengine server service
+   Loaded: loaded (/etc/systemd/system/taosd.service; enabled; vendor preset: en
+   Active: active (running) since Wed 2020-03-04 08:50:17 CST; 15min ago
+ Main PID: 10791 (taosd)
+    Tasks: 23 (limit: 4915)
+   CGroup: /system.slice/taosd.service
+           └─10791 /usr/bin/taosd
+
+3月 04 08:50:17 zjf-B85 systemd[1]: Started TDengine server service.
+3月 04 08:50:17 zjf-B85 TDengine:[10791]: Starting TDengine service...
+3月 04 08:50:17 zjf-B85 TDengine:[10791]: Started TDengine service successfully.
+```
+
+```
+zjf@zjf-B85:~$ taosdemo
+Creating meters super table...
+meters created!
+Creating 10000 table(s)......
+Table(s) created!
+Inserting data......
+SYNC Insert with 10 connections:
+Spent 745.5895 seconds to insert 1000000000 records with 1000 record(s) per request: 1341220.66 records/second
+```
+
+
+    查询超级表下记录总条数：
+
+    taos>select count(*) from test.meters;
+
+    查询10亿条记录的平均值、最大值、最小值等：
+
+    taos>select avg(f1), max(f2), min(f3) from test.meters;
+
+    查询loc="beijing"的记录总条数：
+
+    taos>select count(*) from test.meters where loc="beijing";
+
+    查询areaid=10的所有记录的平均值、最大值、最小值等：
+
+    taos>select avg(f1), max(f2), min(f3) from test.meters where areaid=10;
+
+    对表t10按10s进行平均值、最大值和最小值聚合统计：
+
+    taos>select avg(f1), max(f2), min(f3) from test.t10 interval(10s);