Question

我需要从for循环中从另一个表中选择的单个字符创建单个字符串。有办法吗？

CREATE OR REPLACE TRIGGER TRIGGER_TRIGGER_TRIGGER
BEFORE INSERT OR UPDATE ON TABLE_TABLE_TABLE FOR EACH ROW
declare
  text_length number(10);
  rus_temp varchar2(10);
  latin_temp varchar2(10);
  mc_temp varchar(55);
begin
  begin

      text_length := length(:new.mc);
      mc_temp := (NULL);
      for i in 1..text_length
      LOOP
        letter_temp := (null);
        latin_temp := (null);
        rus_temp := SUBSTR(:new.mc, i, 1);
        select LATINLETTERS INTO latin_temp from LETTERSAPPROXIMATION where rus_temp = RUSSIANLETTERS;

    -- HOW TO ADD UP SELECTED LETTERS INTO ONE STRING        

      END LOOP;

    end if;
  end;
END;

Answer 1

似乎您只需要串联即可，例如：

for i in select someChar from ... loop
  vString := vString || i.someChar;
end loop

没有循环的另一种方式可以是listagg，例如：

select listagg(someChar) within Group (order by ...) from ...

Answer 2

为什么要为此使用for循环？只需使用rpad()。像这样：

select rpad(SUBSTR(:new.mc, i, 1), text_length, SUBSTR(:new.mc, i, 1)
into mc_temp

是否可以从单个字符创建一个字符串？

2 个答案: