隐藏sql查询输出中的列

Question

SELECT 
    MProduct.ProductCode, MProduct.ProductName, COUNT(*) AS Ranges
FROM 
    TProblem 
FULL OUTER JOIN
    MProduct ON TProblem.ProductCode = MProduct.ProductCode 
GROUP BY  
    MProduct.ProductCode, MProduct.ProductName 
ORDER BY 
    Ranges DESC

这是我的查询，但我想隐藏输出中的Ranges列

Answer 1

要维持结果的顺序，只需将计数从您的选择移到订单：

SELECT 
    MProduct.ProductCode, MProduct.ProductName
FROM 
    TProblem 
FULL OUTER JOIN
    MProduct ON TProblem.ProductCode = MProduct.ProductCode 
GROUP BY  
    MProduct.ProductCode, MProduct.ProductName 
ORDER BY 
    count(*) DESC

Answer 2

我知道@marc_s的来源。看起来您正在尝试获取DISTINCT行列表

SELECT DISTINCT 
    MProduct.ProductCode, MProduct.ProductName
FROM 
    TProblem 
FULL OUTER JOIN
    MProduct ON TProblem.ProductCode = MProduct.ProductCode 
    MProduct.ProductCode, MProduct.ProductName 

或者

return Object.assign(state, action.propObj)