Question

我在Oracle 10g上有这个查询：

UPDATE "SCHEMA1"."CELLS_GLIST" 
SET ("GLIST_VALUE_ID", "USER_ID", "SESSION_ID") = (
    SELECT "GLIST_VALUE_ID", 1 AS "USER_ID", 123456 AS "SESSION_ID"
    FROM "SCHEMA1"."GLISTS_VALUES_UOR"
    WHERE ("UOR_ID"=3)
    AND ("GLIST_ID"=67)
    AND ("GLIST_VALUE_DESC" = (
        SELECT "GLIST_VALUE_DESC"
        FROM "BMAN_TP1"."GLISTS_VALUES_UOR"
        WHERE ("UOR_ID"=3)
        AND ("GLIST_VALUE_ID"="CELLS_GLIST"."GLIST_VALUE_ID")
    ))
)
WHERE EXISTS (......)

它一直说 ORA-01407：无法更新（“SCHEMA1”。“CELLS_GLIST”。“SESSION_ID”）为NULL

“SESSION_ID”显然是 Not Nullable ，但我实际上是将值传递给该字段，所以我不明白这个问题。

Answer 1

根据您的评论，我读到您似乎想要在目标表中写入默认记录，以防子查询未返回任何记录。因此，用短语查询的正确方法是使用MERGE语句：

MERGE INTO "SCHEMA1"."CELLS_GLIST" dst
USING (
  -- rephrase your subquery here. This is your "merge data source". The number
  -- of records returned in this subquery will correspond to the number of
  -- affected records in dst
) src
ON (
  -- the missing exists condition here. Everytime this condition matches a record
  -- between dst and src, an UPDATE is performed. Otherwise, an INSERT is
  -- performed
)
WHEN MATCHED THEN UPDATE 
  SET dst."GLIST_VALUE_ID" = src."GLIST_VALUE_ID"
WHEN NOT MATCHED THEN INSERT ("GLIST_VALUE_ID", "USER_ID", "SESSION_ID")
  VALUES (NULL, 1, 123456);

这只是为了给你一个想法。我不太确定你想要详细实现的是什么，所以我省略了子查询和条件

Answer 2

我发现这个查询也可以工作：

UPDATE "BMAN_TP1"."CELLS_GLIST" 
SET "GLIST_VALUE_ID" = (
    SELECT "GLIST_VALUE_ID"
    FROM "BMAN_TP1"."GLISTS_VALUES_UOR"
    WHERE ("UOR_ID"=3)
    AND ("GLIST_ID"=67)
    AND ("GLIST_VALUE_DESC" = (
        SELECT "GLIST_VALUE_DESC"
        FROM "BMAN_TP1"."GLISTS_VALUES_UOR"
        WHERE ("UOR_ID"=3)
        AND ("GLIST_VALUE_ID"="CELLS_GLIST"."GLIST_VALUE_ID")
        ))
    ),
    "SESSION_ID" = 123456,
    "USER_ID" = 1
WHERE EXISTS (......)

但是，它表现得非常快......我怀疑我错过了什么......

Oracle“无法更新为NULL”

2 个答案: