SQL operations under impala

1. concat splicing two strings

   select concat('zhang','077')

   The results: zhang077

Values ​​for the same group by the group 2. group_concat generated in connected, the result returns a string

    First, look at the results of this query value: SELECT DISTINCT ID_TYP, MTD_CDE FROM RTDW.LC_APPL

 

 然后运行：SELECT ID_TYP,GROUP_CONCAT(ID_TYP,MTD_CDE)  FROM (SELECT DISTINCT ID_TYP,MTD_CDE FROM RTDW.LC_APPL ) T  GROUP BY ID_TYP