本文介绍了错误:PLS-00428:此 select 语句中需要一个 into 子句的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试创建一个如下所示的函数，但出现标题中所述的错误.
I'm trying to create a function as shown below but getting the error stated in the title.
create or replace function gettaxmin(period_tax_type_id in double precision, tax_range in number) return double precision is
Result double precision;
begin
SELECT CASE WHEN max(tax_range) is null THEN 0 ELSE max(tax_range) END
FROM period_tax_rates WHERE (tax_range < 1) AND (period_tax_type_id = 2);
return(Result);
end gettaxmin;
有什么想法吗?
推荐答案
您必须将 SELECT 语句的结果存储到一个变量中(在本例中为结果"):
You have to store the result of your SELECT statement into a variable (in this case, "Result"):
create or replace function gettaxmin
(period_tax_type_id in double precision, tax_range in number)
return double precision
is
Result double precision;
begin
SELECT CASE WHEN max(tax_range) is null THEN 0 ELSE max(tax_range) END
INTO Result
FROM period_tax_rates WHERE (tax_range < 1) AND (period_tax_type_id = 2);
return Result;
end gettaxmin;
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