在另一个表列的基础上更新表列

Question

我有2张桌子。"报告"和"panel_calculation"是表格。

report contains:
r_zone   r_address    r_status
=======+==========+============
1          8             0
2          9             0
2          6             0
7          9             0
3          2             0

panel_calculation contains:
p_cal_zone  p_cal_address  p_status
===========+==============+============
7                9             1
3                2             1

我需要在"panel_calculation"表的基础上更新"报告"表中的r_status列。

这样最终的结果将是这样的：

Final 'report' should be like this:
r_zone   r_address    r_status
=======+==========+============
1          8             0
2          9             0
2          6             0
7          9             1
3          2             1

我需要你的建议。

Answer 1

即使在更新表时，您仍然可以连接两个表。

UPDATE  report s
        INNER JOIN panel_calculation b
            ON s.r_zone = b.p_cal_zone
SET     s.r_status = b.p_status

• SQLFiddle 演示

Answer 2

试试这个：

UPDATE report r
INNER JOIN panel_calculation p ON r.r_zone = p.p_cal_zone 
SET r.r_status = p.p_status;

SQL 小提琴演示

Answer 3

作为问题的解决方案，请尝试执行以下sql查询

  update report r set r_status=(select p_status from panel_calculation where p_cal_zone=r.r_zone limit 1 )

Answer 4

你可以像这样使用 LEFT JOIN：

UPDATE report t1
LEFT JOIN panel_calculation t2
    ON t1.r_zone=t2.p_cal_zone
    AND t1.r_address=t2.p_cal_address
SET t1.r_status=t2.p_status