Question

假设我有一个值数组：

（A1，a1，A2，a2，A3，a3，A4，a4 .....，An，an）

如何针对（A1，a1 .....，An，an）对自动执行以下TSQL查询

SELECT COUNT (1)
FROM food
WHERE calories = Ai AND ingredient = ai --i = {1..n}

那么（Ai，ai）{i = 1..n}得到的每个计数都会存储在临时表中吗？

由于

Answer 1

您可以使用动态SQL执行此操作，如下所示：

declare @count int, @limit int
select @count = 0, @limit = 5 -- limit is n

declare @sqlcmd varchar(300)

-- table
create table #result (
combination varchar(10),
total int
)

while @count < @limit
begin
  select @sqlcmd = 'insert into #results select distinct "(" + ingredient + "," + calories + ")", count(*) from food where calories = A' + convert(varchar, @count) + ' and ingredient = a' + convert(varchar, @count)

  exec(@sqlcmd)

  select @count = @count + 1
end

Answer 2

将数组中的值插入临时表（稍后我将使用相同的结果）：

create table #pairs (
    calories    varchar(50),
    ingredient  varchar(50),
    count       int
)

然后，我们可以一步完成结果：

UPDATE p
SET count = x.count
FROM #pairs p inner join
    (   SELECT f.calories, f.ingredient, COUNT(*) as count
        FROM food f inner join
            #pairs p ON f.calories = p.calories and f.ingredient = p.ingredient
        GROUP BY f.calories, f.ingredient
    ) x ON p.calories = x.calories and p.ingredient = x.ingredient


select * from #pairs

如何针对一系列值对运行查询并将结果存储在临时表中？

2 个答案: