SQL查詢複雜的聯接

-1

我有幾個表，我想對MAHASISWASQL查詢複雜的聯接

NAMA的輸出WHERE NIM上MAHASISWA = NIM_MHS上MHS_MAKUL凡（N_TUGAS = 'C' AND N_MID = 'B' ）AND ID_MHS_MAKUL ON NILAI_MAKUL = ID ON MHS_MAKUL

這裏表和列

列表MAHASISWA

NIM | NAMA

MHS_MAKUL

ID | NIM_MHS

NILAI_MAKUL

N_TUGAS | N_MID | ID_MHS_MAKUL

我試圖用這個，但給我的輸出「表‘mahasiswa.nim’不存在」

SELECT mahasiswa.NAMA, mahasiswa.NIM, mhs_makul.ID, nilai_makul.NIM_MHS, 
     nilai_makul.ID_mhs_makul 
FROM mahasiswa 
INNER JOIN mahasiswa.NIM ON mhs_makul.NIM_MHS 
INNER JOIN mhs_makul.ID ON nilai_makul.ID_mhs_makul 
WHERE nilai_makul.N_TUGAS = 'C' AND nilai_makul.N_MID = 'B';

來源

2017-09-26 Yudhistira Bayu

的說法INNER JOIN是一個表，但你使用的是一個字段 – fafl

，選擇mysql和sql-server中的任何一個，它指的是不同的。 –

@YogeshSharma編輯！ –

請學習JOIN語法。

SELECT mahasiswa.NAMA, mahasiswa.NIM, mhs_makul.ID, nilai_makul.NIM_MHS, nilai_makul.ID_mhs_makul 
FROM mahasiswa 
INNER JOIN mhs_makul ON mhs_makul.NIM_MHS = mahasiswa.NIM 
INNER JOIN nilai_makul ON nilai_makul.ID_mhs_makul = mhs_makul.ID 
WHERE nilai_makul.N_TUGAS = 'C' AND nilai_makul.N_MID = 'B';

來源

2017-09-26 08:21:55 Gedrox

嘗試以下查詢：

SELECT mahasiswa.NAMA, mahasiswa.NIM, mhs_makul.ID, nilai_makul.NIM_MHS, 
     nilai_makul.ID_mhs_makul 
FROM mahasiswa 
INNER JOIN mhs_makul ON mahasiswa.NIM = mhs_makul.NIM_MHS 
INNER JOIN nilai_makul ON mhs_makul.ID = nilai_makul.ID_mhs_makul 
WHERE nilai_makul.N_TUGAS = 'C' AND nilai_makul.N_MID = 'B';

Here's爲JOIN的文檔，這是它是如何定義的：

table_reference [INNER | CROSS] JOIN table_factor [join_condition]

所以，你需要在JOIN和列指定表名ON子句中的名稱

來源

2017-09-26 08:23:35

您的語法不正確。該join條款需要參照表，然後on條款具備的條件，此表由加入：

SELECT  mahasiswa.NAMA, 
      mahasiswa.NIM, 
      mhs_makul.ID, 
      nilai_makul.NIM_MHS, 
      nilai_makul.ID_mhs_makul 
FROM  mahasiswa 
INNER JOIN mhs_makul ON mahasiswa.NIM = mhs_makul.NIM_MHS 
INNER JOIN nilai_makul ON mhs_makul.ID = nilai_makul.ID_mhs_makul 
WHERE  nilai_makul.N_TUGAS = 'C' AND 
      nilai_makul.N_MID = 'B';

來源

2017-09-26 08:23:51 Mureinik

工程就像一個魅力，謝謝！ –

連接條件不寫吧，試試這個

SELECT mahasiswa.NAMA, mahasiswa.NIM, mhs_makul.ID, nilai_makul.NIM_MHS, nilai_makul.ID_mhs_makul 
FROM mahasiswa 
INNER JOIN mhs_makul 
ON mhs_makul.NIM_MHS = mahasiswa.NIM 
INNER JOIN nilai_makul 
ON nilai_makul.ID_mhs_makul = mhs_makul.ID 
WHERE nilai_makul.N_TUGAS = 'C' 
AND nilai_makul.N_MID = 'B';

來源

2017-09-26 08:25:54

SQL查詢複雜的聯接

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