查找多个表之间的公共列

Question

我有数百个表格，每个表格包含 400 多列。我想找到这些表之间的公共列的名称。我该怎么做。我在网上找到了一个有效的代码，但只适用于较少数量的表格。当我运行在我的案例中查询时，我收到以下错误--> 'The query processor ran out of internal resources and could not produce a query plan. This is a rare event and only expected for extremely complex queries or queries that reference a very large number of tables or partitions. Please simplify the query. If you believe you have received this message in error, contact Customer Support Services for more information.'

这里是查询：

insert into temp_table 
  select column_name from information_schema.columns where table_name = 'test_datajuly17' 
  intersect select column_name from information_schema.columns where table_name = 'test_datajuly20' 
  intersect select column_name from information_schema.columns where table_name = 'test_datajuly21'

如有任何帮助，我们将不胜感激。谢谢

Answer 1

您可以执行如下操作。

如果您知道要与之比较的 table，请将 table 名称放入临时 table (@TEMPTABLE)，然后执行以下操作

DECLARE @TEMPTABLE AS TABLE
(
    TableName VARCHAR(32)
)

INSERT INTo @TEMPTABLE
VALUES
('spt_fallback_dev'), --test names
('spt_values')



SELECT fulllist.*
FROM INFORMATION_SCHEMA.COLUMNS fulllist
INNER JOIN @TEMPTABLE baseCmp on baseCmp.TableName = fulllist.TABLE_NAME
INNER JOIN
    ( SELECT COLUMN_NAME
      FROM INFORMATION_SCHEMA.COLUMNS isc
      INNER JOIN @TEMPTABLE tt on tt.TableName = isc.TABLE_NAME
      GROUP BY COLUMN_NAME
      HAVING COUNT(*) > 1) temp on temp.COLUMN_NAME = fulllist.COLUMN_NAME
ORDER BY COLUMN_NAME

然后你可以对结果做各种事情（比如旋转它等）

Answer 2

下面的查询做的事情完全一样。所以你不需要内部和外部查询。

SELECT COLUMN_NAME
  FROM INFORMATION_SCHEMA.COLUMNS isc
  INNER JOIN @TEMPTABLE tt on tt.TableName = isc.TABLE_NAME
  GROUP BY COLUMN_NAME
  HAVING COUNT(*) > 1
  ORDER BY COLUMN_NAME

查找多个表之间的公共列

Finding common columns between multiple tables

sql

sql-server

multiple-columns