我有一个查询，查看两个数据库中的INFORMATION_SCHEMA.COLUMNS视图。它查看数据库中的每一列，并将属性与另一个数据库中的同一列（实际上是table.column）进行比较。
代码工作正常，但是当我运行INFORMATION_SCHEMA.COLUMNS时，它会获取表和视图中存在的列的定义。我需要限制查询只查看表。
有人可以建议我怎么做吗？
这是我的代码：
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
提前致谢，
答案 0 :(得分：1)
而不是INFORMATION_SCHEMA我更喜欢使用sys.tables和sys.columns，JOIN object_id上的SELECT *
FROM sys.columns c
JOIN sys.tables t
ON c.object_id = t.object_id
：
sys.views有关观看的信息包含在;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
。
类似的东西：
JOIN或者您可以向当前查询添加sys.tables到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
以清除视图：
JOIN可能需要切换sys.tables {{1}}所在的db。