Question

以下是我的员工表：

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');

以下是我的疑问：

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

如何从结果中排除'blake'？有人告诉我在子查询中使用NOT IN但它不起作用。

Answer 1

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

您也可以在第二次查询中使用not in。

SQLFIDDLE DEMO

如何从嵌套查询的结果中排除名称？

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