PLS-00428：into子句預計在SELECT語句

Question

我試圖創建一個功能，如下圖所示，但得到的錯誤PLS-00428：into子句在SELECT語句

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; 

預期

請幫助我解決這個問題。謝謝

Answer 1

您需要的結果上存入結果

create or replace function gettaxmin(period_tax_type_id in double precision, tax_range in number) return double precision INTO 
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; 

讀成在http://dev.mysql.com/doc/refman/5.0/en/select-into.html

Answer 2

你有你的SELECT語句的結果存儲到一個變量（在這種情況下，「結果「）：

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;