mysql - 根据单元格值更新 MySQL 中的列

Question

我想根据值更新 MySQL 表中的多个单元格。

我发现如果我选择一个名为 engagement 的字段，我可以像这样一次更新一个:

UPDATE billing_info_test 
SET Engagement='800000039768' 
WHERE Engagement IS NULL and LinkedAccountId = '12345678910'

但是，如果我尝试一次执行多个操作，它会失败并且出现错误:

UPDATE billing_info_test 
SET Engagement='800000039768' 
WHERE Engagement IS NULL and LinkedAccountId = '12345678910' 
AND SET Engagement='800000039768' 
WHERE Engagement IS NULL and LinkedAccountId = '3542123267612';

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SET Engagement='800000039768' WHERE Engagement IS NULL and LinkedAccountId = '30' at line 1

在这些语句之间使用 AND 是不正确的吗？我究竟做错了什么？

Answer 1

您可以使用 CASE 语句来完成:

UPDATE billing_info_test 
SET 
  Engagement = CASE 
    WHEN LinkedAccountId = '12345678910' THEN 'something'
    WHEN LinkedAccountId = '3542123267612' THEN 'somethingelse'
    WHEN LinkedAccountId IN ('354', '123', '000') THEN 'somethingelsetoo'
    ELSE 'default'
  END
WHERE Engagement IS NULL