AND 和 OR

你还可以将多个运算符组合在一起以创建更复杂的 WHERE 条件。以下示例使用 Employees 表：

Id   FName     LName    PhoneNumber   ManagerId   DepartmentId    Salary  Hire_date     CreatedDate   ModifiedDate
1    James     Smith    1234567890    NULL        1               1000    01-01-2002    01-01-2002    01-01-2002
2    John      Johnson  2468101214    1           1               400     23-03-2005    23-03-2005    01-01-2002
3    Michael   Williams 1357911131    1           2               600     12-05-2009    12-05-2009    NULL
4    Johnathon Smith    1212121212    2           1               500     24-07-2016    24-07-2016    01-01-2002

和

SELECT * FROM Employees WHERE DepartmentId = 1 AND ManagerId = 1

将返回：

Id   FName     LName    PhoneNumber   ManagerId   DepartmentId    Salary  Hire_date     CreatedDate   ModifiedDate
2    John      Johnson  2468101214    1           1               400     23-03-2005    23-03-2005    01-01-2002

要么

SELECT * FROM Employees WHERE DepartmentId = 2 OR ManagerId = 2

将返回：

Id   FName     LName    PhoneNumber   ManagerId   DepartmentId    Salary  Hire_date     CreatedDate   ModifiedDate
3    Michael   Williams 1357911131    1           2               600     12-05-2009    12-05-2009    NULL
4    Johnathon Smith    1212121212    2           1               500     24-07-2016    24-07-2016    01-01-2002