重命名 sql 表中的字段的問題

Question

所以我有這張桌子：

mysql> SELECT * FROM artists LIMIT 5; 

    +----+----------------+------------+----------+----------------+--------+--------+
    | id | name           | start_year | end_year | origin         | type   | gender |
    +----+----------------+------------+----------+----------------+--------+--------+
    |  4 | Massive Attack |       1987 |     NULL | United Kingdom | Group  | NULL   |
    | 17 | Bob Dylan      |       1941 |     NULL | United States  | Person | Male   |
    | 20 | Art of Noise   |       1983 |     2000 | United Kingdom | Group  | NULL   |
    | 25 | Pavement       |       1989 |     2000 | United States  | Group  | NULL   |
    | 29 | Stevie Wonder  |       1950 |     NULL | United States  | Person | Male   |
    +----+----------------+------------+----------+----------------+--------+--------+


mysql> SELECT name, end_year FROM artists WHERE name IN ("Black Box Recorder");

    +--------------------+----------+
    | name               | end_year |
    +--------------------+----------+
    | Black Box Recorder |     2010 |
    +--------------------+----------+

然后我將表格變小以顯示我想要重命名的年份，我想將其更改為 NULL。 我試過這個命令：

UPDATE artists SET end_year='NULL' WHERE name='Black Box Recorder';

我認為這個命令應該是正確的，但它給出了這個錯誤：

錯誤 1366 (HY000)：第 155 行的列“end_year”的 integer 值“NULL”不正確

Answer 1

請在更新語句中刪除“NULL”中的引號。

UPDATE artists SET end_year=NULL WHERE name='Black Box Recorder'; 

Answer 2

NULL 不等於 varchar2，所以你應該嘗試 end_year=NULL