Microsoft SQL Server 使用CTE删除重复的行
示例
员工表:
| ID | FirstName | LastName | Gender | Salary | +------+-----------+----------+--------+--------+ | 1 | Mark | Hastings | Male | 60000 | | 1 | Mark | Hastings | Male | 60000 | | 2 | Mary | Lambeth | Female | 30000 | | 2 | Mary | Lambeth | Female | 30000 | | 3 | Ben | Hoskins | Male | 70000 | | 3 | Ben | Hoskins | Male | 70000 | | 3 | Ben | Hoskins | Male | 70000 | +------+-----------+----------+--------+--------+
CTE(公用表表达式):
WITH EmployeesCTE AS ( SELECT *, ROW_NUMBER()OVER(PARTITION BY ID ORDER BY ID) AS RowNumber FROM Employees ) DELETE FROM EmployeesCTE WHERE RowNumber > 1
执行结果:
| ID | FirstName | LastName | Gender | Salary | +------+-----------+----------+--------+--------+ | 1 | Mark | Hastings | Male | 60000 | | 2 | Mary | Lambeth | Female | 30000 | | 3 | Ben | Hoskins | Male | 70000 | +------+-----------+----------+--------+--------+