在Postresql中进行更新时，列不明确

Question

如果bx_temp中的min_failed小于表中当前的min_failed值，我正在尝试更新表。

我一直得到一个＆＃34; min_failed是不明确的＆＃34;在我的case语句中引用min_failed。我不能为它分配一个表别名。

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Answer 1

我无法测试查询，但您可以像这样修改它：

WITH c AS (SELECT * FROM b_temp)
UPDATE table b 
SET min_failed = LEAST(c.min_failed,b.min_failed)
-- Use LEAST() instead of case logic. Also fixes your error because you were using SELECT without a FROM
FROM c
WHERE c.user = b.user;