Question

我有两个表，vessel_details和vessel_history。两个表都具有相同的字段。我必须比较所有字段的值，并选择具有不同值的列而不是null。例如，ship_name字段，我必须检查vessel_details表中字段ship_name的值是否与vessel_history表中的ship_name不同。如果值不同且不为null，则必须选择并显示vessel_history中的值。

正确查询的任何想法？感谢。

Answer 1

SELECT vessel_details.<your_id>, 'Difference in Column ship_name for ship_name = ' + vessel_history.ship_name 
FROM vessel_details
JOIN vessel_history ON vessel_details.<your_id> ON vessel_history.<id_from_vessel_details>
WHERE vessel_details.ship_name <> vessel_history.ship_name

UNION

SELECT vessel_details.<your_id>, 'Difference in Column ship_model for ship_model = ' + vessel_history.ship_model 
FROM vessel_details
JOIN vessel_history ON vessel_details.<your_id> ON vessel_history.<id_from_vessel_details>
WHERE vessel_details.ship_model <> vessel_history.ship_model

.
.
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对于您要检查的所有列，等等。

我想找你的是什么？

每个项目编辑一行：

SELECT vessel_details.<your_id>,
CASE WHEN vessel_details.ship_name <> vessel_history.ship_name THEN Convert(bit, 1) ELSE Convert(bit, 0) END AS ship_name_different,
CASE WHEN vessel_details.ship_model <> vessel_history.ship_model THEN Convert(bit, 1) ELSE Convert(bit, 0) END AS ship_model_different
FROM vessel_details
JOIN vessel_history ON vessel_details.<your_id> ON vessel_history.<id_from_vessel_details>
WHERE vessel_details.ship_name <> vessel_history.ship_name 
OR vessel_details.ship_model <> vessel_history.ship_model

如何比较具有相同结构的两个表中的列值，然后选择具有不同值的列

1 个答案: