Question

我想动态地找到表的外键列中存在的NULLs的数量。

我的情景如下：

我需要编写一个以表名作为参数的存储过程。在给出表名时，如果表有任何外键列，结果应该给我外键列中的NULLs的数量，否则给出一条消息说“没有外键”。我发现还需要其他输出。我只是无法在外键列中获得NULLs的编号。

Answer 1

你可以找到像这样的外键：

SELECT
    f.name AS ForeignKey,
    OBJECT_NAME(f.parent_object_id) AS TableName,
    COL_NAME(fc.parent_object_id,
    fc.parent_column_id) AS ColumnName,
    OBJECT_NAME (f.referenced_object_id) AS ReferenceTableName,
    COL_NAME(fc.referenced_object_id,
    fc.referenced_column_id) AS ReferenceColumnName
FROM
    sys.foreign_keys AS f
INNER JOIN sys.foreign_key_columns AS fc ON f.OBJECT_ID = fc.constraint_object_id

你去吧。你有外键。因此，您可以根据需要更改代码。我希望这会对你有所帮助。

要获取外键约束的名称，请使用：

select distinct name from sys.objects where object_id in
    (select fk.constraint_object_id from sys.foreign_key_columns as fk
        where fk.referenced_object_id =
        (select object_id from sys.tables where name = 'TableOthersForeignKeyInto')
    )

如何在SQL Server的外键列中找到数字NULL记录？

1 个答案: