Question

我有一个带有布尔值的表，我想知道一组id是否同时具有这两个值。

这个sql选择我要测试的产品组：

SELECT 
  cp.ItemID,
  cp.IsUnitsOfMeasure
from grouped_products gp
LEFT JOIN products p ON p.product_id = gp.product_id
LEFT JOIN c_products cp ON cp.ItemID = p.product_id
WHERE gp.group_id=123

我想知道该组的cp.IsUnitsOfMeasure是否包含1和0。

Answer 1

试试这个：

SELECT 
    cp.ItemID,
    SUM(cp.IsUnitsOfMeasure) AS sum,
    COUNT(cp.IsUnitsOfMeasure) AS count,
    from grouped_products gp
LEFT JOIN products p ON p.product_id = gp.product_id
LEFT JOIN c_products cp ON cp.ItemID = p.product_id
WHERE gp.group_id=123

如果sum等于count，则所有行都为1
如果sum等于0，则所有行都为0
在所有其他情况下：组中有1和0

Answer 2

SELECT   gp.group_id,
         SUM(cp.IsUnitsOfMeasure=0) AND SUM(cp.IsUnitsOfMeasure=1) AS ContainsBoth,
FROM     grouped_products AS gp
  LEFT JOIN products      AS  p USING (product_id)
  LEFT JOIN c_products    AS cp ON cp.ItemID = p.product_id
GROUP BY gp.group_id

ContainsBoth将TRUE或FALSE表示每个相应的群组是否包含两者 c_product IsUnitsOfMeasure=0 和另一个=1。

如果...语句满足两个条件，则mysql选择true

2 个答案: