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I tried to write the following inner join query using an Oracle database: SELECT Employee.EMPLID as EmpID, Employee.FIRST_NAME AS Name, Team.DEPARTMENT_CODE AS TeamID, Team.Department_Name AS teamname FROM PS_TBL_EMPLOYEE_DETAILS Employee INNER JOIN PS_TBL_DEPARTMENT_DETAILS Team ON Team.DEPARTMENT_CODE = Employee.DEPTID That gives the below error: INNER JOIN PS_TBL_DEPARTMENT_DETAILS Team ON Team.DEPARTMENT_CODE = Employee.DEPTID * ERROR at line 4: ORA-00904: "TEAM"."DEPARTMENT_CODE": invalid identifier The DDL of one table is: CREATE TABLE "HRMS"."PS_TBL_DEPARTMENT_DETAILS" ( "Company Code" VARCHAR2(255), "Company Name" VARCHAR2(255), "Sector_Code" VARCHAR2(255), "Sector_Name" VARCHAR2(255), "Business_Unit_Code" VARCHAR2(255), "Business_Unit_Name" VARCHAR2(255), "Department_Code" VARCHAR2(255), "Department_Name" VARCHAR2(255), "HR_ORG_ID" VARCHAR2(255), "HR_ORG_Name" VARCHAR2(255), "Cost_Center_Number" VARCHAR2(255), " " VARCHAR2(255) ) SEGMENT CREATION IMMEDIATE PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS

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