INFORMATION_SCHEMA.COLUMNS限制搜索到表

Question

我有一个查询在两个数据库中查看INFORMATION_SCHEMA.COLUMNS视图。它查看数据库中的每一列，并将这些属性与另一个数据库中的同一列（实际上是table.column）进行比较。

该代码工作正常，除了当我通过INFORMATION_SCHEMA.COLUMNS运行时，它会检索存在于表和视图中的列的定义。我需要限制查询只看表格。

有人可以建议我该怎么做？

这里是我的代码：

SELECT 
     CASE 
     WHEN src.TABLE_NAME IS NULL AND src.COLUMN_NAME IS NULL 
     THEN 
      tgt.TABLE_NAME + '.' + tgt.COLUMN_NAME 
     ELSE 
      src.TABLE_NAME + '.' + src.COLUMN_NAME 
     END 
     AS object_name, 
FROM [hq193].INFORMATION_SCHEMA.COLUMNS src 
     FULL JOIN [GDI-193-DEV].INFORMATION_SCHEMA.COLUMNS tgt 
     ON  src.table_name = tgt.table_name 
      AND src.COLUMN_NAME = tgt.COLUMN_NAME 
WHERE src.CHARACTER_MAXIMUM_LENGTH != tgt.CHARACTER_MAXIMUM_LENGTH 
     OR src.DATA_TYPE != tgt.DATA_TYPE 
     OR src.IS_NULLABLE != tgt.IS_NULLABLE 
     OR src.NUMERIC_PRECISION != tgt.NUMERIC_PRECISION 
     OR src.NUMERIC_SCALE != tgt.NUMERIC_SCALE 

由于提前，

Answer 1

而不是使用INFORMATION_SCHEMA我更喜欢使用sys.tables和sys.columns，他们JOIN上object_id：

SELECT * 
FROM sys.columns c 
JOIN sys.tables t 
ON c.object_id = t.object_id 

信息的看法载于sys.views。

喜欢的东西：

;WITH db1 AS ( SELECT c.*,t.name Table_Name 
        FROM sys.columns c 
        JOIN sys.tables t 
        ON c.object_id = t.OBJECT_ID 
      ) 
    ,db2 AS ( SELECT c.*,t.name Table_Name 
        FROM db2.sys.columns c 
        JOIN db2.sys.tables t 
        ON c.object_id = t.OBJECT_ID 
      )   
SELECT CASE WHEN db1.Table_Name IS NULL AND db1.name IS NULL 
       THEN db2.Table_Name + '.' + db2.name 
      ELSE db1.Table_Name + '.' + db1.name 
     END AS object_name 
FROM db1 
FULL JOIN db2       
    ON db1.Table_Name = db2.Table_Name 
    AND db1.name = db2.name 
WHERE db1.max_length  <> db2.max_length 
    OR db1.system_type_id <> db2.system_type_id 
    OR db1.is_nullable <> db2.is_nullable 
    OR db1.precision  <> db2.precision 
    OR db1.scale   <> db2.scale 

或者你可以只是一个JOIN到sys.tables添加到您当前查询淘汰的观点：

SELECT 
     CASE 
     WHEN src.TABLE_NAME IS NULL AND src.COLUMN_NAME IS NULL 
     THEN 
      tgt.TABLE_NAME + '.' + tgt.COLUMN_NAME 
     ELSE 
      src.TABLE_NAME + '.' + src.COLUMN_NAME 
     END 
     AS object_name, 
FROM [hq193].INFORMATION_SCHEMA.COLUMNS src 
JOIN [hq193].sys.tables t 
    ON src.table_name = t.name 
     FULL JOIN [GDI-193-DEV].INFORMATION_SCHEMA.COLUMNS tgt 
     ON  src.table_name = tgt.table_name 
      AND src.COLUMN_NAME = tgt.COLUMN_NAME 
WHERE src.CHARACTER_MAXIMUM_LENGTH != tgt.CHARACTER_MAXIMUM_LENGTH 
     OR src.DATA_TYPE != tgt.DATA_TYPE 
     OR src.IS_NULLABLE != tgt.IS_NULLABLE 
     OR src.NUMERIC_PRECISION != tgt.NUMERIC_PRECISION 
     OR src.NUMERIC_SCALE != tgt.NUMERIC_SCALE 

可能需要切换哪个分贝SYS.TABLES JOIN打开。