DISTINCT 用来做去重,在pg中可以实现求分组中最大值. 常规写法: 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-# *info-# FROMinfo-...
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...
In the code in datafusion/functions-aggregate/src/array_agg.rs We have eitherDistinctArrayAggAccumulatororOrderSensitiveArrayAggAccumulatorbut no option for both. This is related to#8583
1.装好Postgres 2.开启远程访问 配置postgresql.conf文件 listen_addresses = '*' 配置pg_hba.conf...
Bug #91993enhance JSON_ARRAYAGG by DISTINCT Submitted:13 Aug 2018 10:53Modified:21 Nov 2019 13:50 Reporter:Andrej ThomsenEmail Updates: Status:VerifiedImpact on me: None Category:MySQL Server: JSONSeverity:S4 (Feature request) Version:8.0.12, 8.0.27OS:Any ...
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...
您可以使用COLLECT(DISTINCT ...)执行聚合，然后将生成的集合转换为JSON：
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...
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,...
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...