使用條件語句將總數計數插入到臨時表中？

Question

我有一些看起來像這樣的數據：

P     D
1     0
1     0
.63   1
.72   1
etc...

現在，我有了一個臨時表，該表需要3個值，並且我想使用第一個表來創建該表，該表根據某些條件保存這些值的總數。

這是一個執行此操作的語句，但是它只能運行一次，我對SQL不太滿意，但是有人可以告訴我如何動態地完成這樣的事情嗎？

INSERT INTO #distribution values(
(SELECT count(P)
FROM myTable
WHERE P > 0.90 AND D = 0), 1, 1)

臨時表中的最后2個值將根據要檢查的條件而變化。

例如，這是我的另一個條件：

WHERE (P BETWEEN 0.80 AND 0.90) AND (D BETWEEN .01 AND .25), 1,2

我在想我需要一個案例聲明，但是想不出如何做到這一點。

---

編輯 ：在某些情況下，其他2列也會更改。

例如：

WHERE (P > 0.90) AND (D BETWEEN .01 AND .25),2,1

Answer 1

如果我理解的話，不確定100％，但我認為您想要以下內容：

INSERT INTO #distribution
SELECT COUNT(1), 1, 1
FROM MyTable
WHERE P > 0.90 AND D = 0
UNION ALL
SELECT COUNT(1), 1, 2
FROM MyTable
WHERE (P BETWEEN 0.80 AND 0.90) AND (D BETWEEN .01 AND .25)

或者，您可以執行以下操作：

SELECT b.TypeCount, a.VALUE1, a.VALUE2
FROM 
   (SELECT 1 AS TypeId, 1 AS VALUE1, 1 AS VALUE2
   UNION ALL
   SELECT 2, 1, 2) ValueTable
JOIN  (SELECT CASE WHEN P > 0.90 AND D = 0  THEN 1 
   WHEN (P BETWEEN 0.80 AND 0.90) AND (D BETWEEN .01 AND .25) THEN 2 END AS TypeId,
   COUNT(1) TypeCount
   FROM MyTable
   GROUP BY SELECT CASE WHEN P > 0.90 AND D = 0  THEN 1 
   WHEN (P BETWEEN 0.80 AND 0.90) AND (D BETWEEN .01 AND .25) THEN 2 END) AS Data
ON Data.TypeId = ValueTable.TypeId

Answer 2

考慮到這是結構化編程而不是事務處理的領域，SQL並不是很擅長。 就像您提到的那樣，考慮到我會提出一份案情陳述。 像這樣：

insert into #distribution
select count(*),
       case t.conditions
        when 1 then 1
        when 2 then 1
        [more conditions...]
       end,
       case t.conditions
        when 1 then 1
        when 2 then 2
        [more conditions...]
       end
from (
    select case
        when P > 0.90 and D = 0 then 1
        when P >= 0.80 and P <= 0.90 and D >= .01 and D <= .25 then 2
        [more conditions...]
    end as conditions
    from myTable
    ) as t
group by conditions

Answer 3

我認為這是您想要的：

insert into #distribution(col1, col2, col3)
    select count(*), 1, grp
    from (select (case when P > 0.90 and D = 0 then 1
                       when P >= 0.80 and P <= 0.90 and D >= .01 and D <= .25 then 2
                  end) as grp
          from myTable
        ) as t
    where grp is not null
    group by grp;

注意：您應該列出insert的列。