mysql - 多列 SQL 的 Case Then 语句

Question

如何使用 Case-Then 设置两列的值？ 我有下一个脚本:

  UPDATE [dbo].[operation_data]
SET block_status = CASE
WHEN sd.status = 'X' THEN 'F'
WHEN sd.status != 'X' and od.block_status = 'F' THEN NULL
ELSE block_status
END
FROM operation_data od
JOIN sales_data sd on sd.operation_data_id = od.operation_data_id
GO

但我想做这样的事情

  WHEN sd.status = 'X' THEN 'F' AND main_comment = 'Expired'

“main_comment”是操作数据中的列。 据我所知，CASE 只能返回单列。有什么好的解决方案吗？

Answer 1

您还必须对另一列重复此操作:

UPDATE [dbo].[operation_data]
SET block_status = CASE
WHEN sd.status = 'X' THEN 'F'
WHEN sd.status != 'X' and od.block_status = 'F' THEN NULL
ELSE block_status
END
, main_comment = CASE
WHEN sd.status = 'X' THEN 'expired'
ELSE main_comment
END
FROM operation_data od
JOIN sales_data sd on sd.operation_data_id = od.operation_data_id