Sql 子查询返回的多行用作表达式,但仅在函数中使用
当我使用一个函数时,它会给出上面提到的错误,但当单独使用相同的代码时,它就可以正常工作。问题出在哪里 玩弄功能: 用清洁选择键拨弄: 样本数据:Sql 子查询返回的多行用作表达式,但仅在函数中使用,sql,postgresql,stored-functions,Sql,Postgresql,Stored Functions,当我使用一个函数时,它会给出上面提到的错误,但当单独使用相同的代码时,它就可以正常工作。问题出在哪里 玩弄功能: 用清洁选择键拨弄: 样本数据: create table report (report_day date, tickets_no integer, tickets_stake numeric, promo_tickets_no integer, promo_tickets_stake numeric, group_id integer); insert into re
create table report
(report_day date,
tickets_no integer,
tickets_stake numeric,
promo_tickets_no integer,
promo_tickets_stake numeric,
group_id integer);
insert into report
values
('2020-07-20',12,569.6, 2, 44,1),
('2020-07-20',61,2000, 5, 260,2),
('2020-07-21',35,1244.2, 11, 250,1),
('2020-07-21',100,2500.5, 29, 575,2),
('2020-07-22',66,2511.8, 23, 670,1),
('2020-07-22',125,3358.2, 50, 990,2);
CREATE OR REPLACE FUNCTION report(arguments json)
RETURNS json AS
$BODY$
DECLARE
dateFrom date;
dateTo date;
selectedType integer;
BEGIN
dateFrom := cast(arguments->>'dateFrom' as date);
dateTo := cast(arguments->>'dateTo' as date);
selectedType := cast(arguments->>'selectedType' as integer);
RETURN (
WITH full_data as (
with tickets as (
select
report_day
, sum(tickets_no) as tickets_no
, sum(tickets_stake) as tickets_stake
FROM report
WHERE selectedType = 0
AND report_day between dateFrom and dateTo
GROUP BY 1)
, promo_tickets as (
select
report_day
, sum(promo_tickets_no) as promo_tickets_no
, sum(promo_tickets_stake) as promo_tickets_stake
FROM report
WHERE selectedType = 1
AND report_day between dateFrom and dateTo
GROUP BY 1)
select
t.report_day
, sum(coalesce(t.tickets_no,0) + coalesce(pt.promo_tickets_no,0)) as tickets_no
, sum(coalesce(t.tickets_stake,0) + coalesce(pt.promo_tickets_stake,0)) as tickets_no
FROM tickets t
LEFT JOIN promo_tickets pt on t.report_day = pt.report_day
GROUP BY 1
ORDER BY 1)
select row_to_json(full_data) from full_data
);
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
select * from report(json_build_object('dateFrom', '2020-07-20', 'dateTo', '2020-07-22','selectedType', 0 ))
因为您试图从只应返回一行的函数中返回多行。在函数中再添加一个参数,最好是主键列(我想
tickets\u no
),例如
并将查询重写为
WITH full_data AS
(WITH tickets AS
(SELECT report_day,
SUM(tickets_no) AS tickets_no,
SUM(tickets_stake) AS tickets_stake
FROM report
WHERE selectedType = 0
AND report_day BETWEEN dateFrom AND dateTo
AND tickets_no = i_tickets_no
GROUP BY 1),
promo_tickets as
(select report_day,
SUM(promo_tickets_no) as promo_tickets_no,
SUM(promo_tickets_stake) as promo_tickets_stake
FROM report
WHERE selectedType = 1
AND report_day BETWEEN dateFrom AND dateTo
GROUP BY 1)
select t.report_day,
SUM(COALESCE(t.tickets_no, 0) + COALESCE(pt.promo_tickets_no, 0)) AS tickets_no,
SUM(COALESCE(t.tickets_stake, 0) +
COALESCE(pt.promo_tickets_stake, 0)) AS tickets_no
FROM tickets t
LEFT JOIN promo_tickets pt
ON t.report_day = pt.report_day
GROUP BY 1
ORDER BY 1)
并通过添加第二个参数调用
因为您试图从只应返回一行的函数中返回多行。在函数中再添加一个参数,最好是主键列(我想
tickets\u no
),例如
并将查询重写为
WITH full_data AS
(WITH tickets AS
(SELECT report_day,
SUM(tickets_no) AS tickets_no,
SUM(tickets_stake) AS tickets_stake
FROM report
WHERE selectedType = 0
AND report_day BETWEEN dateFrom AND dateTo
AND tickets_no = i_tickets_no
GROUP BY 1),
promo_tickets as
(select report_day,
SUM(promo_tickets_no) as promo_tickets_no,
SUM(promo_tickets_stake) as promo_tickets_stake
FROM report
WHERE selectedType = 1
AND report_day BETWEEN dateFrom AND dateTo
GROUP BY 1)
select t.report_day,
SUM(COALESCE(t.tickets_no, 0) + COALESCE(pt.promo_tickets_no, 0)) AS tickets_no,
SUM(COALESCE(t.tickets_stake, 0) +
COALESCE(pt.promo_tickets_stake, 0)) AS tickets_no
FROM tickets t
LEFT JOIN promo_tickets pt
ON t.report_day = pt.report_day
GROUP BY 1
ORDER BY 1)
并通过添加第二个参数调用
如果希望函数像查询一样返回报表对象数组,请更改此部分:
select row_to_json(full_data) from full_data
要将行聚合到数组中,请执行以下操作:
select json_agg(row_to_json(full_data)) from full_data
如果希望函数返回多行,则需要进行两项更改:
CREATE OR REPLACE FUNCTION report(arguments json)
RETURNS table (row_to_json json) AS
对于返回
:
RETURN QUERY (
WITH full_data as (
更新如果希望函数像查询一样返回报表对象数组,请更改此部分:
select row_to_json(full_data) from full_data
要将行聚合到数组中,请执行以下操作:
select json_agg(row_to_json(full_data)) from full_data
如果希望函数返回多行,则需要进行两项更改:
CREATE OR REPLACE FUNCTION report(arguments json)
RETURNS table (row_to_json json) AS
对于返回
:
RETURN QUERY (
WITH full_data as (
更新的是否可以返回多个json行?@sh4rkyy如果函数返回类型为json,则不能返回。请参阅我答案的更新。是否可以返回多个json行?@sh4rkyy如果函数返回类型为
json
,则不可以。请参阅更新我的答案。