>我使用 postgresql
创建了这个存储过程:
create or replace Function GetTimeStamp(
IN t1 timestamp ,
IN t2 timestamp ,
Out reg_os Varchar(50),
Out customer_count int ,
Out t5 timestamp
) returns void AS $$
Begin
SELECT payment.payment_ts AS t , customer.registration_os As os ,count(Distinct customer.customer_id) As total
From customer inner join payment on customer.customer_id = payment.customer_id
Where Payment.payment_ts Between t1 And t2
Group By 1 , 2
Union
SELECT transfer.ts_created AS t , customer.registration_os As os, count(Distinct customer.customer_id) As total
From customer inner join account on customer.customer_id = account.customer_id inner join transfer on account.account_id = transfer.from_account
Where transfer.ts_created Between t1 And t2
Group By 1 , 2;
select t , os , total into t5 , reg_os , customer_count ;
End;
$$ LANGUAGE plpgsql;
我可以创建存储过程,但是当我使用此代码时:
SELECT GetTimeStamp('2016-01-01' ,'2017-01-01') OR
SELECT * FROM GetTimeStamp('2016-01-01' ,'2017-01-01')
它给了我一个错误:
查询没有结果数据的目标 提示:如果要丢弃 选择的结果,请改用执行
.
我在存储过程中使用了执行而不是选择,它给了我
执行附近的语法错误。
我不知道我是否可以在两个执行查询之间使用联合。如何获取此存储过程的结果?
在 PL/pgSQL 中,你需要使用 SELECT ... INTO
来指定应该存储结果的变量。要放弃结果,请使用 PERFORM
而不是 SELECT
。
你需要返回一个集合(table
),它可以是普通的SQL
create or replace Function GetTimeStamp (
IN t1 timestamp ,
IN t2 timestamp
) returns table (
reg_os Varchar(50),
customer_count int,
t5 timestamp
) language sql as $$
SELECT
payment.payment_ts AS t ,
customer.registration_os As os ,
count(Distinct customer.customer_id) As total
From
customer
inner join
payment on customer.customer_id = payment.customer_id
Where Payment.payment_ts Between t1 And t2
Group By 1 , 2
Union
SELECT
transfer.ts_created AS t ,
customer.registration_os As os,
count(Distinct customer.customer_id) As total
From
customer
inner join
account on customer.customer_id = account.customer_id
inner join
transfer on account.account_id = transfer.from_account
Where transfer.ts_created Between t1 And t2
Group By 1 , 2;
$$;