我再次堆叠。我想让所有监督员工的人员少于1人。
在我的结果中，我想念一位主管，所以我觉得我的查询错了。
SELECT c.EmpID,c.name,c.gender,c.salary,COUNT(*) AS superviseeStaff_Count
FROM staff c INNER JOIN staff u ON c.EmpID = u.supervisorFk
And c.position='Supervisor'
GROUP BY c.EmpID,c.name,c.gender, c.salary
HAVING COUNT(*) = 1
结果：
38 Anna-Isabell Green F 32000.0 1
42 Winston Hughes M 22000.0 1
61 Sally Thatcher F 36000.0 1
我想念主管48的主管。
我尝试使用With子句但对结果没有影响。
员工表看起来像： EmpID，姓名，性别，工资，supervisorFk（主管的外键），BranchFK，职位
--Data:
delete from Staff;
-- data for table Staff
-- ---------------------
-- 67 Employees
insert into Staff values ( 1, 'Robert King' ,'M', 143000.0,NULL, 'B002', 'Director');
insert into Staff values ( 2, 'Rafael McDonalds' ,'M', 72000.0, 1,'B001', 'Manager');
insert into Staff values ( 3, 'John White' ,'M', 60000.0, 1,'B003', 'Manager');
insert into Staff values ( 4, 'Susan Brand' ,'F', 55000.0, 1,'B004', 'Manager');
insert into Staff values ( 5, 'Cathy Brown' ,'F', 32000.0, 2,'B001', 'Supervisor');
insert into Staff values ( 6, 'Claire Dujeune' ,'F', 79000.0, 1,'B010', 'Manager');
insert into Staff values ( 7, 'Patty Summer' ,'F', 23000.0, 2,'B001', 'Supervisor');
insert into Staff values ( 8, 'Mary Fleming' ,'F', 43000.0, 1,'B011', 'Manager');
insert into Staff values (10, 'Anne Beech' ,'F', 26000.0, 5,'B001', 'Assistant');
insert into Staff values (12, 'Paul Coplien' ,'M', 27000.0, 3,'B003', 'Supervisor');
insert into Staff values (13, 'David Ford' ,'M', 41000.0, 1,'B012', 'Manager');
insert into Staff values (14, 'Mary Howe' ,'F', 55000.0, 1,'B005', 'Manager');
insert into Staff values (15, 'Julie Lee' ,'F', 34000.0, 3,'B003', 'Supervisor');
insert into Staff values (16, 'Aaron Young' ,'M', 74000.0, 1,'B013', 'Manager');
insert into Staff values (17, 'Albert Thomson' ,'M', 25000.0,13,'B012', 'Supervisor');
insert into Staff values (21, 'Alexander Reynolds','M', 37000.0, 5,'B001', 'Assistant');
insert into Staff values (18, 'Christine McDonalds','F',38000.0, 4,'B004', 'Supervisor');
insert into Staff values (19, 'Elisa Pinkerton' ,'F', 36000.0,16,'B013', 'Supervisor');
insert into Staff values (20, 'Eric Montgomery' ,'M', 33000.0, 7,'B001', 'Assistant');
insert into Staff values (22, 'Edward Robinson' ,'M', 28000.0, 7,'B001', 'Assistant');
insert into Staff values (23, 'Jesse Owens' ,'M', 34000.0, 4,'B004', 'Supervisor');
insert into Staff values (25, 'Johnatan Hunter' ,'M', 45000.0, 1,'B014', 'Manager');
insert into Staff values (26, 'Lenita Kennedy' ,'F', 56000.0, 1,'B009', 'Manager');
insert into Staff values (27, 'Lisa Miller' ,'F', 34000.0,25,'B014', 'Supervisor');
insert into Staff values (28, 'Lilly Jennings' ,'F', 36000.0,14,'B005', 'Supervisor');
insert into Staff values (29, 'Rafaela Johnson' ,'F', 23000.0,12,'B003', 'Assistant');
insert into Staff values (32, 'Harry Anderson' ,'M', 40000.0,12,'B003', 'Assistant');
insert into Staff values (33, 'George Bailey' ,'M', 73000.0, 1,'B006', 'Manager');
insert into Staff values (34, 'Salomon Beckett' ,'M', 46000.0, 1,'B008', 'Manager');
insert into Staff values (35, 'Susan Armstrong' ,'F', 28000.0,15,'B003', 'Assistant');
insert into Staff values (36, 'Rosa Hemingway' ,'F', 30000.0,15,'B003', 'Assistant');
insert into Staff values (37, 'Martha McDonalds' ,'F', 31000.0,15,'B003', 'Assistant');
insert into Staff values (38, 'Anna-Isabell Green','F', 32000.0,33,'B006', 'Supervisor');
insert into Staff values (39, 'Tina Hall-Becker' ,'F', 34000.0,18,'B004', 'Assistant');
insert into Staff values (40, 'Thomas Harrison' ,'M', 42000.0, 1,'B007', 'Manager');
insert into Staff values (42, 'Winston Hughes' ,'M', 22000.0,40,'B007', 'Supervisor');
insert into Staff values (44, 'Walter Jefferson' ,'M', 23000.0,18,'B004', 'Assistant');
insert into Staff values (45, 'Zara Newton' ,'F', 24000.0,23,'B004', 'Assistant');
insert into Staff values (46, 'Nina McDonalds' ,'F', 25000.0,23,'B004', 'Assistant');
insert into Staff values (48, 'Carol Moore' ,'M', 27000.0,40,'B007', 'Supervisor');
insert into Staff values (51, 'Alexander Porter' ,'M', 29000.0,17,'B012', 'Assistant');
insert into Staff values (52, 'Maria Quasimodo' ,'M', 30000.0,17,'B012', 'Assistant');
insert into Staff values (53, 'Bertrand Russel' ,'M', 31000.0,34,'B008', 'Supervisor');
insert into Staff values (54, 'Ashley Parker' ,'M', 25500.0,28,'B005', 'Assistant');
insert into Staff values (55, 'John Stuart' ,'M', 23500.0,28,'B005', 'Assistant');
insert into Staff values (56, 'Ruth Sanderss' ,'F', 27700.0,19,'B013', 'Assistant');
insert into Staff values (57, 'Rafael Smith' ,'M', 32000.0,19,'B013', 'Assistant');
insert into Staff values (58, 'Viola Rutherford' ,'F', 21000.0,27,'B014', 'Assistant');
insert into Staff values (59, 'Sammy Churchill' ,'M', 22000.0,27,'B014', 'Assistant');
insert into Staff values (60, 'Miriam Thorne' ,'F', 26000.0,27,'B014', 'Assistant');
insert into Staff values (61, 'Sally Thatcher' ,'F', 36000.0,34,'B008', 'Supervisor');
insert into Staff values (62, 'Larry Escott' ,'M', 33000.0,26,'B009', 'Supervisor');
insert into Staff values (63, 'William Spencer' ,'M', 32000.0, 6,'B010', 'Supervisor');
insert into Staff values (64, 'Diana Ashley-Bell','F', 38000.0, 8,'B011', 'Supervisor');
insert into Staff values (65, 'Audrey Thorne' ,'F', 25000.0,62,'B009', 'Assistant');
insert into Staff values (66, 'Paula Burns' ,'F', 24000.0,62,'B002', 'Assistant');
insert into Staff values (67, 'Amanda Wallis' ,'F', 23000.0,38,'B006', 'Assistant');
insert into Staff values (68, 'Patty Stokes' ,'F', 22000.0,53,'B008', 'Assistant');
insert into Staff values (69, 'Holly Fields' ,'F', 21500.0,53,'B008', 'Assistant');
insert into Staff values (70, 'Martha McCulloch' ,'F', 26000.0,61,'B008', 'Assistant');
insert into Staff values (71, 'Maurin Best' ,'F', 22500.0,42,'B007', 'Assistant');
insert into Staff values (72, 'Martha McDonalds' ,'F', 23500.0,27,'B014', 'Assistant');
insert into Staff values (73, 'Barrigan' ,NULL, 23500.0,27,'B013', 'Assistant');
insert into Staff values (47, 'Naomi Campell' ,'F', 26000.0,63,'B010', 'Assistant');
insert into Staff values (49, 'Tony McDonalds' ,'M', 28000.0,63,'B010', 'Assistant');
insert into Staff values (50, 'Margret McElroy' ,'F', 29000.0,64,'B011', 'Assistant');
insert into Staff values ( 9, 'Carl Maier' ,'M', 31000.0,64,'B011', 'Assistant');
我正在尝试这个但没有工作：
WITH Tree
AS (
SELECT
EmpID,
name,
gender,
salary,SupervisorFK,
1 AS Level
FROM staff
WHERE position='Supervisor'
UNION ALL
SELECT
st.EmpID,
st.name,
st.gender,
st.salary,st.SupervisorFK,
level + 1
FROM Staff AS st
JOIN Tree uh ON uh.EmpID = st.SupervisorFK
)
SELECT * FROM Tree
答案 0 :(得分：0)
实际上这很简单。在您的源数据中，没有supervisorFk值为48的员工，因此主管＃48（Carol Moore）没有员工。由于您正在基于该外键执行INNER JOIN，因此该记录永远不会出现在初始集中。你甚至没有进入HAVING的{{1}}条款 - 用户不计算在内。
将其更改为COUNT(*)=1并制作LEFT JOIN，或添加COUNT(*)<=1 supervisorFk的记录，然后您就会看到该用户。