Question

我的数据结构类似于：

Person | Counter
Mary       1
Mary       2
John       5
John       6

我正在尝试在Person列上分组依据，并为每个人添加计数器的值。意思是，我想回来：

Person - Mary - Has 3 Counters
Person - John - Has 11 Counters

这是我目前的努力，但不起作用：

SELECT ('Person - '+  ISNULL(NULLIF([Person],''),'NOT ASSIGNED') + 'Has') as Name, 
COUNT(*) Match, (SELECT COUNT(*) + 'Counters' FROM [MyTable] )  Total 
FROM [MyTable]

Answer 1

你想要的是像你所说的一个分组条款，所以基于这个：

SELECT Person, SUM(Counter)
FROM MyTable
GROUP BY Person

我没有包含原始查询中的额外文字，以使其更紧凑。

Answer 2

你走了：

DECLARE @DATA TABLE (Person VARCHAR(25), [Counter] INT)

INSERT INTO @DATA
SELECT 'Mary',1 UNION
SELECT 'Mary',2 UNION
SELECT 'John',5 UNION
SELECT 'John',6

SELECT 'Person - ' + ISNULL(Person,'Not Assigned') + ' - has ' + CAST(SUM([Counter]) AS VARCHAR) + ' counters'
from @DATA
GROUP BY Person

Answer 3

你应该使用聚合函数。

SELECT ('Person - '+  ISNULL(NULLIF([Person],''),'NOT ASSIGNED') + 'Has') as Name, 
       COUNT(*) As Match,       
       Sum(Counter) As Count
FROM   [MyTable]   
Group By Person

你在第二行也错过了As。 Sum Aggregate函数将对每个组的所有值求和，在本例中为计数器。

Answer 4

Cheruvian的回答可能就是你想要的，我不能通过你的例子准确地说出来，以下是我想出的以防万一。

SELECT 'Person - ' + ISNULL(NULLIF(Person, ''), 'NOT ASSIGNED') + ' - Has ' + SUM(Counter) + ' Counters' As ReportOutput
FROM MyTable
GROUP BY Person
ORDER BY Person;

Answer 5

我会在子选择中使用GROUP BY来执行此操作，然后使用结果构建字符串。像这样：

SELECT ('Person - '+  myperson + ' Has ' + CAST(mycount  AS VARCHAR) + ' Counters')
FROM (SELECT ISNULL(NULLIF([Person],''),'NOT ASSIGNED') myperson, sum(counter) mycount
      FROM [MyTable]
      GROUP BY ISNULL(NULLIF([Person],''),'NOT ASSIGNED')) a

添加与列数类似的Int列值

5 个答案: