Question

因此，如果我使用以下查询，我想知道已匹配了多少行

MERGE (targetTable) AS t 
USING (sourceTable) AS s
ON t.ID = s.ID
WHEN MATCHED THEN
  (some statements)
WHEN NOT MATCHED BY SOURCE THEN
  (some statements)
WHEN NOT MATCHED BY TARGET THEN
  (some statements)

所以我想知道

的计数

匹配
与来源不匹配
与目标不匹配

我知道你可以计算输出，但如果我没记错，输出只会考虑插入，更新和删除。

Answer 1

你可以在合并之前运行这样的东西：

SELECT  SUM(CASE WHEN t.ID = s.ID THEN 1 ELSE 0 END) as [Matched],
        SUM(CASE WHEN s.ID IS NULL THEN 1 ELSE 0 END) as [NotMatchedByTarget],
        SUM(CASE WHEN t.ID IS NULL THEN 1 ELSE 0 END) as [NotMatchedBySource]
FROM targetTable AS t 
FULL OUTER JOIN sourceTable AS s
    ON t.ID = s.ID

SQL - 使用合并并计算匹配和不匹配的结果

1 个答案: