Set-returning functions(SRF)是一类返回集合(即多行)的函数。它们与返回单个值的标量函数相对。例如,generate_series、unnest、jsonb_array_elements等都是常见的SRF。这些函数在执行时会生成一系列的值,而不是单个值。 2. 为什么set-returning functions不允许在UPDATE语句中使用? 在SQL中,UPDATE语句用于修改表中的...
ERROR:0A000:set-returningfunctionsarenotallowedinindexexpressionsLINE1:createindexidx_a_1ona (jsonb_array_elements(js)); ^LOCATION: check_srf_call_placement, parse_func.c:2251 5、创建一个UDF,将SRF结果转换为ARRAY postgres=#createor replacefunctionsrf_to_arr(jsonb)returnstext[]as$$selectarray(s...
PL/pgSQL - SQL过程语言 PL/pgSQL 是 PostgreSQL 数据库系统的一个可加载的过程语言，它的设计目标是...
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Hologres已支持的集合返回函数列表如下。当前Hologres版本支持的函数是PostgreSQL的一个子集,函数的使用方法请参见集合返回函数。 函数 功能 GENERATE_SERIES 从起始值到结束值生成一个固定步长的数值或日期序列。 GENERATE_SUBSCRIPTS 为给定数组的指定维度生成有效下标集。 GENERATE_SERIES GENERATE_SERIES(start, stop [,...
I do not agree that this is a bug - at least not according to the SQL standard ISO9075:1992 According to ISO9075, the set functions MAX, MIN, SUM and AVG should return NULL if the underlying table is empty. Ref. ISO9075:1992, Chap 6.5, General Rules 2b): b) If AVG, MAX, MIN...
Hologres已支援的集合返回函數列表如下。當前Hologres版本支援的函數是PostgreSQL的一個子集,函數的使用方法請參見集合返回函數。 函數 功能 GENERATE_SERIES 從起始值到結束值產生一個固定步長的數值或日期序列。 GENERATE_SUBSCRIPTS 為給定數組的指定維度產生有效下標集。 GENERATE_SERIES GENERATE_SERIES(start, stop [,...
functions under the just-downloaded 7.4.1 release. -- Ezra Epstein "ezra epstein" <ee_newsgroup_p ost@prajnait.co m> wrote in message news:RPCcnc_G2c QVbXWiXTWc-g@speakeasy.net ...[color=blue] > I'm been banging my head over this for a little while now. > > Here...
So I think that the set-returning functions in the CASE statements needs to be changed to allow Davical to run on PostgreSQL version 10. I'm not a Postgres DBA so I don't know what needs to be done to fix this problem, but do have several machines I can test changes on.Assignee...
However, even a simple call to it always returns 1: CODE: debug.dump(setlistener("/sim/aero", func{var x=0;}, 0,0));debug.dump(setlistener("/sim/aero", func{var x=0;}, 1,0));debug.dump(setlistener("/sim/aero", func{var x=0;}, 0,1));debug.dump(setlistener("/sim/te...