在列中按行筛选

Question

╔════════╦═══════╗
║ ItemID ║ Value ║
╠════════╬═══════╣
║      1 ║ A     ║
║      1 ║ C     ║
║      2 ║ A     ║
║      2 ║ D     ║
║      3 ║ A     ║
║      3 ║ C     ║
╚════════╩═══════╝

我怎样才能获得物品数量 等于A和C的值

在这种情况下应该是2（第1项和第3项）

Answer 1

Select Count(Item_Id) from TableName where Value='A' or Value='C'
group by Item_Id having Count(Item_Id)>1

Answer 2

假设value对于每个itemId

都是唯一的

SELECT COUNT(*)
FROM
(
   SELECT ItemID
   FROM tableName
   WHERE value IN ('A', 'C') -- the values you are looking
   GROUP BY ItemID
   HAVING COUNT(*) = 2       -- the number of values
) a

• SQLFiddle Demo