sql - 此查询的性能调整？

Question

我有以下查询来支持按员工姓名排序的员工分页

SELECT rowNumAlias
    ,Employee.employeeId
    ,Employee.NAME
FROM (
    SELECT row_number() OVER (
            ORDER BY Employee.NAME ASC
            ) rowNumAlias
        ,employeeId
        ,NAME
    FROM Employee
    ) employeeData
INNER JOIN Employee ON Employee.employeeId = employeeData.employeeId
WHERE rowNumAlias BETWEEN ? AND ?

其中参数 rowNumAlias 可以是 1 到 100 之间的任意整数

这个查询在我有 100 万条记录的 sql server 数据库上花费了大约 7 秒。 有什么方法可以最大限度地减少查询执行时间？

Answer 1

你可以这样尝试:

SELECT * FROM (
SELECT (SELECT row_number() OVER (ORDER BY e2.NAME ASC) FROM Employee e2 WHERE Employee.employeeId = E2.employeeId) rowNumAlias,
    ,Employee.employeeId
    ,Employee.NAME
FROM Employee 
) e3 WHERE e3.rowNumAlias BETWEEN ? AND ?