Sql SSMS:如何查找名称相似但数据类型不同的列
如何在预定义的表范围内查找名称相似但数据类型不同的列 背景:验证项目中的列元数据 例如:列deal_id用于3个表中 我想确保交易id元数据在任何地方都是相同的 为避免以下情况:Sql SSMS:如何查找名称相似但数据类型不同的列,sql,validation,sql-server-2008,metadata,information-schema,Sql,Validation,Sql Server 2008,Metadata,Information Schema,如何在预定义的表范围内查找名称相似但数据类型不同的列 背景:验证项目中的列元数据 例如:列deal_id用于3个表中 我想确保交易id元数据在任何地方都是相同的 为避免以下情况: 表1。交易id为nvarchar(50) 表2。交易id为varchar(50) 表3。交易id为nvarchar(60) 请尝试以下方法: ;with t1 as -- get tables with the same column names ( select *
- 表1。交易id为nvarchar(50)
- 表2。交易id为varchar(50)
- 表3。交易id为nvarchar(60)
;with
t1 as -- get tables with the same column names
( select *
, count(*) over(partition by column_name) clm_cnt
from information_schema.columns
where TABLE_NAME like '%' -- specify scope of your tables here, otherwise it will look within entire DB
),
t2 as -- get flags - if amount of distinct types/lengths/etc are >1
( select *
,cast(clm_cnt - count(*) over(partition by column_name,COLUMN_DEFAULT ) as bit) is_diff_COLUMN_DEFAULT
,cast(clm_cnt - count(*) over(partition by column_name,IS_NULLABLE ) as bit) is_diff_IS_NULLABLE
,cast(clm_cnt - count(*) over(partition by column_name,DATA_TYPE ) as bit) is_diff_DATA_TYPE
,cast(clm_cnt - count(*) over(partition by column_name,CHARACTER_MAXIMUM_LENGTH) as bit) is_diff_CHARACTER_MAXIMUM_LENGTH
,cast(clm_cnt - count(*) over(partition by column_name,CHARACTER_OCTET_LENGTH ) as bit) is_diff_CHARACTER_OCTET_LENGTH
,cast(clm_cnt - count(*) over(partition by column_name,NUMERIC_PRECISION ) as bit) is_diff_NUMERIC_PRECISION
,cast(clm_cnt - count(*) over(partition by column_name,NUMERIC_PRECISION_RADIX ) as bit) is_diff_NUMERIC_PRECISION_RADIX
,cast(clm_cnt - count(*) over(partition by column_name,NUMERIC_SCALE ) as bit) is_diff_NUMERIC_SCALE
,cast(clm_cnt - count(*) over(partition by column_name,DATETIME_PRECISION ) as bit) is_diff_DATETIME_PRECISION
,cast(clm_cnt - count(*) over(partition by column_name,COLLATION_NAME ) as bit) is_diff_COLLATION_NAME
from t1
where clm_cnt>1
)
select *
from t2
where 1=1
and
( 0
--| is_diff_COLUMN_DEFAULT
--| is_diff_IS_NULLABLE
| is_diff_DATA_TYPE
| is_diff_CHARACTER_MAXIMUM_LENGTH
| is_diff_CHARACTER_OCTET_LENGTH
| is_diff_NUMERIC_PRECISION
| is_diff_NUMERIC_PRECISION_RADIX
| is_diff_NUMERIC_SCALE
| is_diff_DATETIME_PRECISION
| is_diff_COLLATION_NAME
)>0
您可以通过查询
information\u schema.column
获得有差异的列名。对于已高亮显示的属性:
select column_name
from information_schema.columns c
group by column_name
having min(data_type) <> max(data_type) or
coalesce(min(CHARACTER_MAXIMUM_LENGTH), -1) <> coalesce(max(CHARACTER_MAXIMUM_LENGTH), -1) or
coalesce(min(NUMERIC_PRECISION), -1) <> coalesce(max(NUMERIC_PRECISION), -1) or
coalesce(min(NUMERIC_PRECISION_RADIX), -1) <> coalesce(max(NUMERIC_PRECISION_RADIX), -1) or
coalesce(min(NUMERIC_SCALE), -1) <> coalesce(max(NUMERIC_SCALE), -1) or
coalesce(min(DATETIME_PRECISION), -1) <> coalesce(max(DATETIME_PRECISION), -1) ;
选择列名称
从信息_schema.c列
按列名称分组
最小值(数据类型)最大值(数据类型)或
合并(最小(字符最大长度),-1)合并(最大(字符最大长度),-1)或
合并(最小(数值精度),-1)合并(最大(数值精度),-1)或
合并(最小值(数值精度基数),-1)合并(最大值(数值精度基数),-1)或
合并(最小值(数字刻度),-1)合并(最大值(数字刻度),-1)或
合并(最小(日期时间精度),-1)合并(最大(日期时间精度),-1);
您可能还希望包括:
CHARACTER\u SET\u NAME
COLLATION\u NAME