如何动态在表中获取多个行的总和

Question

我正在尝试从数据库中多个表的特定数据类型（货币）的列中获取总和。目前，我能够从特定表中获取列列表，但我无法从这些列中获得总和。

这就是我现在拥有的结果，

    use database 1 
Select + Column_Name
    From information_schema.columns
    Where TABLE_NAME = 'claimant'
    and data_type = 'money'

结果看起来像

table_name	column_name
table_1	column_a
table_1	column_b
table_1 column_1	column_1

我想要的

table_name	column_name column_name	total_name
table_sum table_a	column_a	66.20
table_1	column_b	300.50
table_1 column_c	column_c	5389.42

for @squirrel for @squirrel for @squirrel在这里保持@squirrel在这里的代码我的截断问题。

{

declare @sql nvarchar(max);

select  @sql = 'with cte as (' + char(13)
            + 'select' + char(13)
            + string_agg(char(9) + quotename(column_name) + ' = sum(' + quotename(COLUMN_NAME) + ')', ',' + char(13)) + char(13)
            + 'from ' + max(quotename(table_name)) + char(13)
            + ')' + char(13)
            + 'select a.table_name, a.column_name, a.total_sum ' + char(13)
            + 'from   cte ' + char(13)
            + 'cross apply (' + char(13)
            + char(9) + 'values' + char(13)
            + string_agg(char(9) + '(''' + table_name + ''',''' + column_name  + ''',' + quotename(COLUMN_NAME) + ')', ',' + char(13)) + char(13)
            + ') a (table_name, column_name, total_sum)'
from   information_schema.columns AS A
INNER JOIN EDL01.STAGING.TABLE_DETAILS B
ON A.TABLE_NAME = B.DEST_TABLE_NAME
where  A.table_name = B.DEST_TABLE_NAME
and    data_type  = 'money'



print @sql
exec sp_executesql @sql 
}

创建表

CREATE TABLE [staging].[TABLE_DETAILS](
    [SOURCE_TABLE_NAME] [varchar](100) NULL,
    [DEST_TABLE_NAME] [varchar](100) NULL,
    [TYPE] [varchar](10) NULL,
    [PRIORITY] [int] NULL,
    [SOURCE_TABLE_DATABASE] [varchar](50) NULL,
    [SOURCE_TABLE_SCHEMA] [varchar](50) NULL,
    [DEST_TABLE_DATABASE] [varchar](50) NULL,
    [DEST_TABLE_SCHEMA] [varchar](50) NULL
) ON [PRIMARY]
GO

下面是下面的

select a.table_name, a.column_name, a.total_sum 
from   cte 
cross apply (
    values
('PAYMENT','BILLEDAMOUNT',[BILLEDAMOUNT]),
    ('PAYMENT','AMOUNT',[AMOUNT]),
    ('SIMS_PAYMENT','CHECKAMOUNT',[CHECKAMOUNT]),
    ('BILLREVIEWHEADER','JURISDICTIONAMOUNT1',[JURISDICTIONAMOUNT1]),
    ('BILLREVIEWHEADER','JURISDICTIONAMOUNT2',[JURISDICTIONAMOUNT2]),
    ('BILLREVIE

Answer 1

您需要动态形成查询，然后使用 sp_executesql 或 exec（）

注意： char（9）是TAB， char（13）是马车返回。这些被添加以格式化查询，以便当您打印以进行验证时可以阅读。

declare @sql nvarchar(max);

select @sql = 'with cte as (' + char(13)
            + 'select' + char(13)
            + string_agg(char(9) + quotename(column_name) + ' = sum(' + quotename(column_name) + ')', ',' + char(13)) + char(13)
            + 'from ' + max(quotename(table_name)) + char(13)
            + ')' + char(13)
            + 'select a.table_name, a.column_name, a.total_sum ' + char(13)
            + 'from   cte ' + char(13)
            + 'cross apply (' + char(13)
            + char(9) + 'values' + char(13)
            + string_agg(char(9) + '(''' + table_name + ''', ''' + column_name + ''',' + quotename(column_name) + ')', ',' + char(13)) + char(13)
            + ') a (table_name, column_name, total_sum)'
from   information_schema.columns
where  table_name = 'table_1'
and    data_type  = 'money'

print @sql
exec sp_executesql @sql

对于您的示例表，生成的动态查询正在

with cte as (
select
    [column_a] = sum([column_a]),
    [column_b] = sum([column_b]),
    [column_c] = sum([column_c])
from [table_1]
)
select a.table_name, a.column_name, a.total_sum 
from   cte 
cross apply (
    values
    ('table_1', 'column_a',[column_a]),
    ('table_1', 'column_b',[column_b]),
    ('table_1', 'column_c',[column_c])
) a (table_name, column_name, total_sum)

编辑
使用循环迭代每个表。基本上，它在表上对每个表执行查询，然后将结果插入临时表中，

请参见

对于没有String_agg（）的早期SQL Server版本

select @sql  = 'with cte as (' + char(13)
             + 'select' + char(13)
             + stuff
               (
                  (
                      select ',' + quotename(COLUMN_NAME) + ' = sum(' + quotename(COLUMN_NAME) + ')'
                      from   INFORMATION_SCHEMA.COLUMNS
                      where  TABLE_NAME = @table
                      and    DATA_TYPE  = 'money'
                      for xml path('')
                  ), 
                  1, 1, ''
               ) + char(13)
            + 'from ' + max(quotename(@table)) + char(13)
            + ')' + char(13)
            + 'select a.table_name, a.column_name, a.total_sum ' + char(13)
            + 'from   cte ' + char(13)
            + 'cross apply (' + char(13)
            + char(9) + 'values' + char(13)
            + stuff
            (
              (
                  select    ',' + '(''' + TABLE_NAME + ''', ''' + COLUMN_NAME + ''',' + quotename(COLUMN_NAME) + ')'
                  from   INFORMATION_SCHEMA.COLUMNS
                  where  TABLE_NAME = @table
                  and    DATA_TYPE  = 'money'
                  for xml path('')
              ),
            1, 1, ''
            )
            + ') a (table_name, column_name, total_sum)' + char(13)