mysql如果...語句符合兩個條件，則選擇true

Question

我有一個帶有布爾值的表，我想知道是否有一組id具有兩個值。

這個SQL選擇組產品我想測試：

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 

我想找出是否cp.IsUnitsOfMeasure爲組同時包含1和0

Answer 1

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將TRUE或FALSE以指示無論每個組別是否包含都 a c_product與IsUnitsOfMeasure=0和另一個與=1。

Answer 2

試試這個：

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等於count然後所有的線都爲1
• 如果sum是等於0，那麼所有的線都爲0
在所有其他情況下
• ：你有兩個1和0的組中