转载链接1:https://blog.csdn.net/qq_24699959/article/details/79863664
转载链接2:https://blog.csdn.net/qq_24699959/article/details/80090050
Impala SQL 语言元素(翻译):https://my.oschina.net/weiqingbin/blog/189413#OSC_h2_2
Impala数据类型:https://blog.csdn.net/yidu_fanchen/article/details/78295499
1、字符串截取substr,从1开始,而不是0;注意一个汉字长度是3
select brand,substr(brand,1,6) from dw_bill_his limit 10;