Postgres sql table return statement - sql-server

Question

I got a question related to an translation from SQL Server to Postgres.
I got an table return statement and I don't know how to translate this to Postgres.
my code:
CREATE FUNCTION [dbo].[GetLastUpdatedFluidTreated](#InjectionPoint_ID UNIQUEIDENTIFIER)
RETURNS #Return TABLE (
[RT_FluidTreated_ID] [uniqueidentifier] NOT NULL,
[CL_FluidTreatedType_ID] [uniqueidentifier] NOT NULL,
[Timestamp] [datetime] NULL,
[Last_Updated_Time] [datetime] NULL,
[NewOrModified] [bit] NULL,
[Origin_ID] [uniqueidentifier] NULL,
[IsNew] [bit] NULL
)
AS
BEGIN
INSERT INTO #Return
Select Top 1
x1.[RT_FluidTreated_ID],
x1.[CL_FluidTreatedType_ID],
x1.[Timestamp],
x1.[Last_Updated_Time],
x1.[NewOrModified],
x1.[Origin_ID],
x1.[IsNew]
from RT_FluidTreated x1
WHERE x1.RE_InjectionPoint_ID = #InjectionPoint_ID
Order by x1.[Last_Updated_Time] desc
RETURN;
END
this code above is on sql server.
Can someone help me? thanks

Answer 1

I think a simple set-returning function is what you are looking for:
create function getlastupdatedfluidtreated(p_injectionpoint_id uuid)
returns table (
rt_fluidtreated_id uuid not null,
cl_fluidtreatedtype_id uuid not null,
timestamp timestamp null,
last_updated_time timestamp null,
newormodified boolean null,
origin_id uuid null,
isnew boolean null)
as
$$
select
x1.rt_fluidtreated_id,
x1.cl_fluidtreatedtype_id,
x1.timestamp,
x1.last_updated_time,
x1.newormodified,
x1.origin_id,
x1.isnew
from rt_fluidtreated x1
where x1.re_injectionpoint_id = p_injectionpoint_id
order by x1.last_updated_time desc
limit 1 --<< replaces TOP 1
$$
language sql;
I adjusted the used data types to the most reasonable types in Postgres. You will need to adjust that to the actual types you have used in your table rt_fluidtreated