Question

我有以下表格变量

DECLARE @insertedTable Table (ServiceId INT)

我通过一些SQL查询向其中插入ServiceId

现在我需要通过交叉联接BranchServices将值插入@insertedTable表

我写了以下SQL查询

INSERT INTO BranchServices
    SELECT b.BranchId
    ,its.ServiceId
    ,CASE WHEN(SELECT MIN(SortValue) FROM BranchServices WHERE FkBranchId = b.BranchId) IS NOT NULL THEN 0 END
     FROM @insertedTable its
    CROSS JOIN Branch b where b.IsActive = 1;

当@insertedTable表与ServiceId表不存在BranchServices时，上述查询工作正常。因为BranchServices的表ServiceId是主键。

因此，现在我需要检查，如果BranchServices表已经具有ServiceId，则不需要运行以下查询，否则，需要运行查询。如何使用合并？如果是的话，怎么写

INSERT INTO BranchServices
    SELECT b.BranchId
    ,its.ServiceId
    ,CASE WHEN(SELECT MIN(SortValue) FROM BranchServices WHERE FkBranchId = b.BranchId) IS NOT NULL THEN 0 END
     FROM @insertedTable its
    CROSS JOIN Branch b where b.IsActive = 1;

Answer 1

总的猜测：

INSERT INTO BranchServices (BranchId, ServiceId, OtherColumn) --Don't know what the name of the third column is
SELECT b.BranchId,
       its.ServiceId,
       CASE WHEN (SELECT MIN(SortValue)FROM BranchServices WHERE FkBranchId = b.BranchId) IS NOT NULL THEN 0 END
FROM @insertedTable its
     CROSS JOIN Branch b
     LEFT JOIN BranchServices BS ON its.ServiceId = BS.ServiceId
WHERE b.IsActive = 1
  AND BS.ServiceId IS NULL;

旁注，空格对于编写可读代码确实非常重要，我建议对它进行好的使用。

如何检查表变量是否具有ID

1 个答案: