[ahmedba]

I need to make schedule for Instructor include
day,time,date time,courses,classes(lab or class room),instructor
so that i designed my database as following
my relations as following
Instructor with courses many to many
class with instructor many to many
Relation between class and instructor many to many because instructor can teach in more classroom and class room can have more instructor

CREATE TABLE [dbo].[Courses](
    [CourseID] [int] IDENTITY(1,1) NOT NULL,
    [CourseName] [nvarchar](50) NOT NULL,
 CONSTRAINT [PK_dbo.Courses] PRIMARY KEY CLUSTERED 
(
    [CourseID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

CREATE TABLE [dbo].[Class](
    [ClassID] [int] IDENTITY(1,1) NOT NULL,
    [ClassName] [nvarchar](50) NOT NULL,
 CONSTRAINT [PK_dbo.Class] PRIMARY KEY CLUSTERED 
(
    [ClassID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

CREATE TABLE [dbo].[Instructor](
    [InstructorID] [int] IDENTITY(1,1) NOT NULL,
    [IstructorName] [nvarchar](50) NOT NULL,
 CONSTRAINT [PK_dbo.Instructor] PRIMARY KEY CLUSTERED 
(
    [InstructorID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

CREATE TABLE [dbo].[InstructorCourses](
    [CourseID] [int] NOT NULL,
    [InstructorID] [int] NOT NULL,
    [fromtime] [nvarchar](50) NULL,
    [totime] [nvarchar](50)  NULL,
    [day] [nvarchar](50) NULL,
 CONSTRAINT [PK_dbo.InstructorCourses] PRIMARY KEY CLUSTERED 
(
    [CourseID] ASC,
    [InstructorID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
CREATE TABLE [dbo].[Instructor_Class](
	[ClassID] [int] NOT NULL,
	[InstructorID] [int] NOT NULL,
 CONSTRAINT [PK_dbo.Instructor_Class] PRIMARY KEY CLUSTERED 
(
	[ClassID] ASC,
	[InstructorID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

To make schedule for instructor i make relation between Instructor table and Courses table many to many and generate third table
InstructorCourses table have InstructorID and CourseID
But
How to add ClassID to table InstructorCourses although Class table have relation many to many with table Instructor

[astonecipher]

The only hint I will give, you are thinking in the wrong direction.

Every heard of a joining table?

[ahmedba]

IF Possible can you tell me what is wrong

[astonecipher]

What do you mean, what is wrong? You don't have anything for it to be wrong. Look up what a joining table is.