ARRAY_AGG

description

Syntax

ARRAY_AGG(col)

Concatenation of values in a column (including the null value) into an array can be used for multiple rows to one row (row to column).

notice

• The order of the elements in an array is not guaranteed.
• Returns the array generated by the transformation. The element type in the array is the same as the col type.

example

mysql> select * from test_doris_array_agg;
+------+------+
| c1   | c2   |
+------+------+
|    1 | a    |
|    1 | b    |
|    2 | c    |
|    2 | NULL |
|    3 | NULL |
+------+------+
mysql> select c1, array_agg(c2) from test_doris_array_agg group by c1;
+------+-----------------+
| c1   | array_agg(`c2`) |
+------+-----------------+
|    1 | ["a","b"]       |
|    2 | [NULL,"c"]      |
|    3 | [NULL]          |
+------+-----------------+

keywords

ARRAY_AGG