/*Displays employees’ last names and the Job Title and GROUP Job Title*/
USE [EXAMPLEDB]
SELECT empLName
FROM tblEmployee
这里是我困惑的地方,我如何使用两个不同的表来包含员工姓氏和其他员工职位名称?SQL - 如何GROUP BY
SELECT jobTitle
FROM tblJobTitle
GROUP BY jobTitle
这些都是我的表:
--This Code Creates the Job Title Table--
CREATE TABLE [SHATTKudlerFineFoods].dbo.tblJobTitle
(
jobJobID varchar (4) CONSTRAINT PK_jobJobID PRIMARY KEY Not Null,
jobJobClass varchar (60) Not Null,
jobTitle varchar (60) Not Null,
jobDescription varchar (300) Not Null,
jobStatus varchar (11) Not Null
)
--This Code Creates the Employee Table--
CREATE TABLE [SHATTKudlerFineFoods].dbo.tblEmployee
(
empEmpID varchar (3) CONSTRAINT PK_empEmployeeID PRIMARY KEY Not Null,
empLName varchar (20) Not Null,
empFName varchar (15) Not Null,
empAddress varchar (30) Not Null,
empCity varchar (20) Not Null,
empState varchar (2) Not Null,
empZIPCode varchar (5) Not Null,
empAreaCode varchar (3) Not Null,
empPhoneNo varchar (8) Not Null,
empGender varchar (1) Not Null,
empDOB smalldatetime Not Null,
empAge Tinyint Not Null,
empHireDate smalldatetime Not Null,
empNoOfExempt Tinyint Not Null,
empMaritalStatus varchar (3) Not Null,
empSalary money Not Null,
empStoreID varchar (4) CONSTRAINT FK_strStoreID FOREIGN KEY REFERENCES
tblStores(strStoreID) Not Null,
empJobID varchar (4) CONSTRAINT FK_jobJobID FOREIGN KEY REFERENCES
tblJobTitle(jobJobID) Not Null
)
您将需要使用连接从多个表中获取数据。如果你需要每个职位的所有员工的姓名,你将不得不使用GROUP_CONCAT(在mysql中,但不是标准sql的一部分) – bmorgan21
与答案没有关系,但是..而不是'GROUP BY',你可以使用'DISTINCT' ...'GROUP BY'更适合聚合 –