在 Postgresql 中进行更新时列不明确

Question

如果 bx_temp 中的 min_failed 小于 table 中的当前 min_failed 值，我正在尝试更新 table。

我不断收到 "min_failed is ambiguous" 指的是我的案例陈述中的 min_failed。不过我也不能给它分配一个 table 别名。

  with c as (select * from b_temp)
    update table b 
    set min_failed = (select case when ct.min_failed < min_failed then ct.min_failed else min_failed end)
    from c
    where c.user = b.user

Answer 1

我无法测试查询，但您可以这样修改它：

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;

在 Postgresql 中进行更新时列不明确

Column is ambiguous when doing an update in Postresql

postgresql

updates

sql-update