分享：sp_get_table_max 获取实例下表行数最大的表

use master
go

if OBJECT_ID('sp_create_table_sql','P') is not null
drop proc sp_create_table_sql
go
create proc sp_create_table_sql ( @tablename varchar(255) )
as
begin
-- exec sp_create_table_sql 'Ad_AdGroup'
-- 0. 弘恩
-- 1. 不支持非主键类的索引
-- 2. 不支持主分键的非默认排序
-- 3. 不支持DEFAULT
-- 4. 不支持计算列
-- 5. 待完整
declare @sql_create varchar(max) = '';
declare @sql_column varchar(max);
declare @sql_primary varchar(max);

with cte as
(
select  QUOTENAME( c.name )+' '+
TYPE_NAME(c.system_type_id)+' '+
case when  TYPE_NAME( c.system_type_id) in  ('char','varchar','decimal')  then ' ( '  else ''  end +
case when  TYPE_NAME( c.system_type_id) in  ('char','varchar','nvarchar'  )  then cast(max_length as varchar)  else ''  end+
case when  TYPE_NAME( c.system_type_id) in  ('decimal'  )  then cast(c.precision as varchar)+','+cast(c.scale AS varchar) else ''  end+
case when  TYPE_NAME( c.system_type_id) in  ('char','varchar','decimal')  then ' ) ' else ''  end +
case when c.is_nullable = 1 then ' null ' else ' not null ' end +
case when c.is_identity = 0 then ' ' else ' identity ' end  sqlstr ,

column_id
from sys.objects as o
join sys.columns as c on o.object_id = c.object_id
where o.name = @tablename and o.type = 'U'
)
select @sql_column = stuff(
(select  ',' + sqlstr  + CHAR(10)
from cte
order by column_id asc
for xml path('') ),1,1,'')
;

select @sql_primary = stuff((
select ',' + c.name
from sys.index_columns as i
join sys.indexes as ix on i.object_id = ix.object_id  and i.index_id = ix.index_id
join sys.columns as c on i.object_id = c.object_id  and i.column_id = c.column_id
where OBJECT_NAME(i.object_id) = @tablename
and ix.is_primary_key = 1
order by i.key_ordinal
for xml path('')
),1,1,'')

set @sql_create = ' create table ' + @tablename + '( '
+   @sql_column
+ case when len(@sql_primary) >= 1 then  (', primary key ( ' + @sql_primary + ')') else '' end
+ ' ) '

print ' -- @sql_create -- '
print @sql_create
end

GO
EXEC sp_MS_marksystemobject 'sp_create_table_sql'
GO