导入数据
1. 使用集成引擎
HDFS ****
FILE
MYSQL ****
KAFKA ****
2. 表函数
mysql **** hdfs **** ...
3. insert导入
insert into tb_name select from tb_name2
create table tmp_b as select * from a;
4. cat本地文件
cat /app.csv | clickhouse-client --query = "insert into tb_name format csv"
