如何從嵌套查詢的結果中排除名稱？

Question

以下是我的雇員表：

create table EMPLOYEES
(EmpID    char(4)         unique Not null,
 Ename    varchar(10),
 Job      varchar(9),
 MGR      char(4),
 Hiredate date,
 Salary   decimal(7,2),
 Comm     decimal(7,2),
 DeptNo   char(2)         not null,
     Primary key(EmpID),
     Foreign key(DeptNo) REFERENCES DEPARTMENTS(DeptNo));


insert into EMPLOYEES values (7839,'King','President',null,'17-Nov-11',5000,null,10);
insert into EMPLOYEES values (7698,'Blake','Manager',7839,'01-May-11',2850,null,30);
insert into EMPLOYEES values (7782,'Clark','Manager',7839,'02-Jun-11',2450,null,10);
insert into EMPLOYEES values (7566,'Jones','Manager',7839,'02-Apr-11',2975,null,20);
insert into EMPLOYEES values (7654,'Martin','Salesman',7698,'28-Feb-12',1250,1400,30);
insert into EMPLOYEES values (7499,'Allen','Salesman',7698,'20-Feb-11',1600,300,30);
insert into EMPLOYEES values (7844,'Turner','Salesman',7698,'08-Sep-11',1500,0,30);
insert into EMPLOYEES values (7900,'James','Clerk',7698,'22-Feb-12',950,null,30);
insert into EMPLOYEES values (7521,'Ward','Salesman',7698,'22-Feb-12',1250,500,30);
insert into EMPLOYEES values (7902,'Ford','Analyst',7566,'03-Dec-11',3000,null,20);
insert into EMPLOYEES values (7369,'Smith','Clerk',7902,'17-Dec-10',800,null,20);
insert into EMPLOYEES values (7788,'Scott','Analyst',7566,'09-Dec-12',3000,null,20);
insert into EMPLOYEES values (7876,'Adams','Clerk',7788,'12-Jan-10',1100,null,20);
insert into EMPLOYEES values (7934,'Miller','Clerk',7782,'23-Jan-12',1300,null,10);

以下是DEPARTMENTS表：

create table DEPARTMENTS
    (DeptNo   char(2)  unique Not null,
     DName    varchar(14),
     Location varchar(13),
         Primary key(DeptNo));


insert into DEPARTMENTS values (10,'Accounting','New York');
insert into DEPARTMENTS values (20,'Research','Dallas');
insert into DEPARTMENTS Values (30,'Sales','Chicago');
insert into DEPARTMENTS values (40,'Operations','Boston');

以下是我的查詢：

select ename, salary
from EMPLOYEES
where DeptNo in
(select DeptNo
from EMPLOYEES
where Ename ='blake');

如何從結果中排除“布雷克”？ 有人告訴我在子查詢中使用NOT IN ，但是它不起作用。

Answer 1

select ename, salary
from EMPLOYEES
where DeptNo in
(select DeptNo
from EMPLOYEES
where Ename ='blake') and Ename <>'blake';

您還可以在第二個查詢中使用not in 。

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