在array_agg函数中排序

Question

我有一个查询如下所示

SELECT 
  league.country as id, 
  array_agg(DISTINCT row(league.id, league.name::varchar)) AS league_names, 

FROM league 
GROUP BY league.country

如何在array_agg函数中按League.name::varchar排序？

Answer 1

集合接受ORDER BY 。 所以你可以这样写：

array_agg(thecol ORDER BY someothercol)

例如

array_agg(
  DISTINCT 
  row(league.id, league.name::varchar) 
  ORDER BY league.name
) AS league_names,