我正在尝试创建一个如下所示的函数但是得到错误pls-00428：在这个select语句中需要一个into子句
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;
请帮我解决这个问题.谢谢
您必须将SELECT语句的结果存储到变量中(在本例中为“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;
