我对Postgresql很新。我几天前下载了Postgresql的v9.5，发现这个数据库非常具有挑战性，只是试图从一个相当长的SELECT语句中获取我的结果集。我使用的是pgAdmin III产品，并希望我能看到我的结果数据，但无济于事。
我已经继承了这段代码并尝试进行更改，并尝试不使用HARD CODE使用变量的行，如果可以避免的话。
我已经在谷歌上搜索了2天但又无济于事，我尝试了很多不同的版本，但仍然没有做正确的事情。任何帮助/方向将不胜感激。
以下是我遇到的错误：
********** Error **********
ERROR: query has no destination for result data
SQL state: 42601
Hint: If you want to discard the results of a SELECT, use PERFORM instead.
Context: PL/pgSQL function getrecords() line 14 at SQL statement
这是我的代码（对不起查询的长度）：
CREATE OR REPLACE FUNCTION getRecords() RETURNS TABLE (
title TEXT,
Number_of_visits BIGINT,
Daily_Visit_Total_hours TEXT,
First_Aid_Visits BIGINT,
First_Aid_Total_hours TEXT,
Major_Accident_Visits BIGINT,
Major_Accident_Total_hours TEXT,
Illness_Visits BIGINT,
Illness_Total_hours TEXT,
Medication_Administration_Visits BIGINT,
Medication_Administration_Total_hours TEXT,
Specialization_Visits BIGINT,
Specialization_Total_hours TEXT,
Diabetic_Visits BIGINT,
Diabetic_Total_Hours TEXT) AS $$
#variable_conflict use_variable
DECLARE
SYEAR_DATE NUMERIC;
START_DATE DATE;
END_DATE DATE;
SCHOOL_ID NUMERIC;
BEGIN
SYEAR_DATE := 2015;
START_DATE := '2015-08-01';
END_DATE := '2015-12-31';
SCHOOL_ID := 002;
SELECT DISTINCT
'999 - DISTRICT TOTALS',
dailyVisitTotal.count as Number_of_visits,
round (dailyVisitTotal.duration_total / 60, 2) || 'hrs' as Daily_Visit_Total_hours,
firstAid.count as First_Aid_Visits,
round (firstAid.duration_total / 60, 2) || 'hrs' as First_Aid_Total_hours,
majorAcc.count as Major_Accident_Visits,
round (majorAcc.duration_total / 60, 2) || 'hrs' as Major_Accident_Total_hours,
illness.count as Illness_Visits,
round (illness.duration_total / 60, 2) || 'hrs' as Illness_Total_hours,
medicationAdminTotal.count as Medication_Administration_Visits,
round (medicationAdminTotal.duration_total / 60, 2) || 'hrs' as Medication_Administration_Total_hours,
specTotal.count as Specialization_Visits,
round (specTotal.duration_total / 60, 2) || 'hrs' as Specialization_Total_hours,
diabeticTotal.count as Diabetic_Visits,
round (diabeticTotal.duration_total / 60, 2) || 'hrs' as Diabetic_Total_Hours
FROM student_enrollment se
LEFT JOIN (
SELECT
se.syear,
count(*),
sum(coalesce(log_field20::numeric, 0)) as duration_total
FROM custom_field_log_entries sle
INNER JOIN student_enrollment se
on (sle.source_id=se.student_id
and se.custom_9 is null
and se.syear=SYEAR_DATE
--and se.syear=2015
and se.end_date is null)
WHERE
--student_field_id = 400000941
legacy_field_id = 400000941
and log_field2::date between START_DATE and END_DATE
--and log_field2::date between '2015-08-01' and '2015-12-31'
and (log_field20 ~ '^[0-9]+$' or log_field20 is null)
GROUP BY se.syear
) dailyVisitTotal
on (se.syear = dailyVisitTotal.syear)
LEFT JOIN (
SELECT
se.syear,
count(*),
sum(coalesce(log_field20::numeric, 0)) as duration_total
FROM custom_field_log_entries sle
INNER JOIN student_enrollment se
on (sle.source_id=se.student_id
and se.custom_9 is null
and se.syear=SYEAR_DATE
--and se.syear=2015
and se.end_date is null)
WHERE
--student_field_id = 400000941
legacy_field_id=400000941
and log_field2::date between START_DATE and END_DATE
--and log_field2::date between '2015-08-01' and '2015-12-31'
and (log_field20 ~ '^[0-9]+$' or log_field20 is null)
and log_field4='Y'
GROUP BY se.syear
) firstAid
on (se.syear = firstAid.syear)
LEFT JOIN (
SELECT
se.syear,
count(*),
sum(coalesce(log_field20::numeric, 0)) as duration_total
FROM custom_field_log_entries sle
INNER JOIN student_enrollment se
on (sle.source_id=se.student_id
and se.custom_9 is null
and se.syear=SYEAR_DATE
--and se.syear=2015
and se.end_date is null)
WHERE
--student_field_id = 400000941
legacy_field_id=400000941
and log_field2::date between START_DATE and END_DATE
--and log_field2::date between '2015-08-01' and '2015-12-31'
and (log_field20 ~ '^[0-9]+$' or log_field20 is null)
and log_field9='Y'
GROUP BY se.syear
) majorAcc
on (se.syear = majorAcc.syear)
LEFT JOIN (
SELECT
se.syear,
count(*),
sum(coalesce(log_field20::numeric, 0)) as duration_total
FROM custom_field_log_entries sle
INNER JOIN student_enrollment se
on (sle.source_id=se.student_id
and se.custom_9 is null
and se.syear=SYEAR_DATE
--and se.syear=2015
and se.end_date is null)
WHERE
--student_field_id = 400000941
legacy_field_id=400000941
and log_field2::date between START_DATE and END_DATE
--and log_field2::date between '2015-08-01' and '2015-12-31'
and (log_field20 ~ '^[0-9]+$' or log_field20 is null)
and log_field5='Y'
GROUP BY se.syear
) illness
on (se.syear = illness.syear)
LEFT JOIN (
SELECT
se.syear,
count(*),
sum(coalesce(log_field2::numeric, 0)) as duration_total
FROM custom_field_log_entries sle
INNER JOIN student_enrollment se
on (sle.source_id=se.student_id
and se.custom_9 is null
and se.syear=SYEAR_DATE
--and se.syear=2015
and se.end_date is null)
WHERE
--student_field_id = 400001237
legacy_field_id=400001237
and log_field5::date between START_DATE and END_DATE
--and log_field5::date between '2015-08-01' and '2015-12-31'
and (log_field2 ~ '^[0-9]+$' or log_field2 is null)
GROUP BY se.syear
) medicationAdminTotal
on (se.syear = medicationAdminTotal.syear)
LEFT JOIN (
SELECT
se.syear,
count(*),
sum(coalesce(log_field11::numeric, 0)) as duration_total
FROM custom_field_log_entries sle
INNER JOIN student_enrollment se
on (sle.source_id=se.student_id
and se.custom_9 is null
and se.syear=SYEAR_DATE
--and se.syear=2015
and se.end_date is null)
WHERE
--student_field_id = 400009202
legacy_field_id=400009202
and log_field3::date between START_DATE and END_DATE
--and log_field3::date between '2015-08-01' and '2015-12-31'
and (log_field11 ~ '^[0-9]+$' or log_field11 is null)
GROUP BY se.syear
) specTotal
on (se.syear = specTotal.syear)
LEFT JOIN (
SELECT
se.syear,
count(*),
sum(coalesce(log_field14::numeric, 0)) as duration_total
FROM custom_field_log_entries sle
INNER JOIN student_enrollment se
on (sle.source_id=se.student_id
and se.custom_9 is null
and se.syear=SYEAR_DATE
--and se.syear=2015
and se.end_date is null)
WHERE
--student_field_id = 400009003
legacy_field_id=400009003
and log_field1::date between START_DATE and END_DATE
--and log_field1::date between '2015-08-01' and '2015-12-31'
and (log_field14 ~ '^[0-9]+$' or log_field14 is null)
GROUP BY se.syear
) diabeticTotal
on (se.syear = diabeticTotal.syear)
WHERE
se.syear = SYEAR_DATE
--se.syear = 2015
and se.end_date is null
and se.custom_9 is null
and se.syear=SYEAR_DATE
--and se.syear=2015
and se.end_date is null
and (
specTotal.duration_total is not null
or dailyVisitTotal.duration_total is not null
or diabeticTotal.duration_total is not null
or medicationAdminTotal.duration_total is not null
)
ORDER BY 1;
END $$ LANGUAGE 'plpgsql';
SELECT * FROM getRecords();
答案 0 :(得分：0)
Add RETURN QUERY before your query. That should tell postgres to return the records from your query.
BEGIN
SYEAR_DATE := 2015;
START_DATE := '2015-08-01';
END_DATE := '2015-12-31';
SCHOOL_ID := 002;
RETURN QUERY SELECT DISTINCT
'999 - DISTRICT TOTALS',
dailyVisitTotal.count as Number_of_visits,
round (dailyVisitTotal.duration_total / 60, 2) || 'hrs' as Daily_Visit_Total_hours,
firstAid.count as First_Aid_Visits,
...