如何根據條件從另一個表中更新表中的列？

學生表（student_id數據，school_code，名稱，年份，...）
校表（學校ID，School_code，School_name，一年等.. ..）

我想更新與基於學校代碼和今年學校代碼表中的學校ID列學生表中的列school_code。我有五年的數據。所以school_id每年都有所不同。

我的查詢語句

UPDATE Master.Student 
    SET school_code=(select school_id from Master.school as sc 
    JOIN master.student as st 
    ON st.school_code=sc.school_code 
WHERE sc.year=x) 
WHERE st.year=x;

但它沒有更新。我遇到了subquery returns more than one value的錯誤。

來源

2012-09-11 Pavi

這是因爲你越來越schoo_id'的'多個值。並顯示你的完整錯誤。 – hims056

沒有任何給定的答案可以幫助你嗎？ – hims056

對不起......我的問題解決了......謝謝你的所有 – Pavi

爲什麼要使用子查詢時，您可以直接做到這一點？

UPDATE st 
    SET st.school_code = sc.school_id 
FROM master.student AS st 
    JOIN Master.school AS sc 
ON st.school_code = sc.school_code 
WHERE sc.year=x 
    AND st.year=x;

欲瞭解更多信息，請參見UPDATE (Transact-SQL)

來源

2012-09-11 05:13:41 hims056

UPDATE Master.Student 
SET school_code = sc.school_id 
from Master.school as sc 
where school_code=sc.school_code 
and year=x 
and st.year=x;

來源

2012-09-11 05:10:14

嘗試此查詢

UPDATE student SET school_code = c.school_id 
FROM student t 
    INNER JOIN school c 
    ON t.school_code = c.school_code AND t.year = c.year 
WHERE c.year=x

來源

2012-09-11 05:26:11 Nitesh

如何根據條件從另一個表中更新表中的列？

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