简化查询

Question

我有疑问，需要简化。但是不知道如何。我该怎么办？

SELECT city, SUM(weight) FROM Details
WHERE city = 'London' OR city = 'Paris'
GROUP BY city;
GO

SELECT * FROM Employees
WHERE Department = 'sales' OR Department = 'supply'
GO

SELECT * FROM Employees
WHERE (Department = 'sales' OR Department = 'supply') AND Salary >= 6000;
GO

Answer 1

您可以使用IN：

SELECT city, SUM(weight) FROM Details
WHERE city IN ('London', 'Paris')
GROUP BY city;

SELECT * FROM Employees
WHERE Department IN ('sales', 'supply');

SELECT * FROM Employees
WHERE Department IN ('sales', 'supply') AND Salary >= 6000;

Answer 2

您可以使用IN

WHERE city IN ('London','Paris')
GROUP BY city;
GO

WHERE Department IN ('sales','supply')
GO