---

{ “title”: “ARRAY_AGG”, “language”: “en” }

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