我创建一个这样的程序

DELIMITER $$
CREATE PROCEDURE proc_tambah_na ( IN v_nis VARCHAR( 20 ))
BEGIN
DECLARE v_selesai INTEGER DEFAULT 0;
DECLARE v_semester INTEGER;
DECLARE v_nilai INTEGER DEFAULT 0;
DECLARE v_jur INTEGER;

DECLARE cur_mp CURSOR FOR
    select semester, sum(nilai) as jml_nilai_mp from mengambil_mp amp join mata_pelajaran mp on (amp.kd_mp=mp.kd_mp) where nis=v_nis;

SELECT id_jurusan INTO v_jur FROM siswa s jOIN kelas k on (s.id_kelas=k.id_kelas) where nis=v_nis;

DECLARE cur_mp_un CURSOR FOR
    select semester, sum(nilai) as jml_nilai_mp_un from mengambil_mp amp join mata_pelajaran mp on (amp.kd_mp=mp.kd_mp) where nis=8091010010 and ket_mp_un='ya' and (jurusan=v_jur or jurusan=1) group by semester;

DECLARE CONTINUE HANDLER FOR NOT FOUND SET v_selesai = 1;

OPEN cur_mp;

get_nilai_mp : LOOP
    FETCH cur_mp INTO v_semester, v_nilai;

    IF v_selesai = 1 THEN
        LEAVE get_nilai_mp;
    END IF;

    INSERT INTO nilai_akhir (nis, semester, jml_nilai_mp) VALUES (v_nis, v_semester, v_nilai);
END LOOP get_nilai_mp;
CLOSE cur_mp;

SET v_selesai=0;

OPEN cur_mp_un;

get_nilai_mp_un : LOOP
    FETCH cur_mp_un INTO v_semester, v_nilai;

    IF v_selesai = 1 THEN
        LEAVE get_nilai_mp_un;
    END IF;

    UPDATE nilai_akhir SET nilai=v_nilai WHERE nis=v_nis AND semester=v_semester;

END LOOP get_nilai_mp_un;

CLOSE cur_mp_un;

END $$

DELIMITER ;


但它返回错误信息:


  # 1064-您的SQL语法错误;在第13行上,检查与您的MySQL服务器版本相对应的手册以获取正确的语法,以在'DECLARE cur_mp_un CURSOR FOR select semester,sum(nilai)as jml_nilai_'附近使用


我不知道那条线是什么问题。我认为这已经是正确的,但是为什么我要返回该错误信息。

PS:对不起,变量名,我用我的母语,所以不要被那个困扰

最佳答案

有一个没有GROUP BY子句的聚合函数sum(nilai)
聚合函数只能与GROUP BY一起使用。


  DECLARE cur_mp_un CURSOR FOR
    选择一个学期,sum(nilai)作为jml_nilai_mp
    来自mengambil_mp放大器
    加入mata_pelajaran mp于(amp.kd_mp = mp.kd_mp)
        nis = v_nis
        按学期分组;

10-08 12:38