DISTINCT 用来做去重,在pg中可以实现求分组中最大值. 常规写法: AI检测代码解析 info=# WITH ranked_employees AS (info(# SELECTinfo(# ROW_NUMBER() OVER (info(# PARTITION BY department ORDER BY salary DESCinfo(# ) AS rn,info(# *info(# FROMinfo(# employeeinfo(# )info-# SELECTinfo-# *inf...
在PostgreSQL 中,`json_build_object` 和 `array_agg` 是两个非常有用的函数,它们可以用来构建 JSON 对象和处理数组。然而,`distinct` 关键字不...
array_agg support distinct for complex types and more than one inputs, rewrite it to group by just one input with non-nest types, use array_agg_distinct mysql> select array_agg(name order by 1), ...
线下DWS 8115版本,针对这种使用方式有什么优化方法(数据量1亿条左右)? select a,b,array_to_string(array_agg(distinct c),',') as d from testtable group by 1,2,3;
2.1.2.144 S098, ARRAY_AGG 2.1.2.145 S111, ONLY in query expressions 2.1.2.146 S151, Type predicate 2.1.2.147 S161, Subtype treatment 2.1.2.148 S162, Subtype treatment for references 2.1.2.149 S201, SQL routines on arrays 2.1.2.150 S201-01, Array parameters 2.1.2.151 S201-02, Array as...