Constraints And Keys

Feb 5, 2008

Hello:

I have the followig table that has constraints:


CREATE TABLE [dbo].[MD_HIERARCHY](

[MedDRA_Version_No_C] [varchar](10) NULL,

[PT_ID_N] [bigint] NULL,

[HLT_ID_N] [bigint] NULL,

[HLGT_ID_N] [char](18) NULL,

[SOC_ID_N] [bigint] NULL,

[PT_C] [varchar](100) NOT NULL,

[HLT_C] [varchar](100) NOT NULL,

[HLGT_C] [varchar](10) NOT NULL,

[SOC_C] [varchar](100) NOT NULL,

[SOC_Abbr_C] [varchar](5) NOT NULL,

[Null_Field_C] [char](1) NULL,

[PT_SOC_ID_N] [bigint] NULL,

[Primary_SOC_Flag_C] [char](1) NULL

) ON [PRIMARY]

GO

SET ANSI_PADDING OFF

GO

ALTER TABLE [dbo].[MD_HIERARCHY] WITH CHECK ADD CONSTRAINT [R_14] FOREIGN KEY([MedDRA_Version_No_C], [PT_ID_N])

REFERENCES [dbo].[PT] ([MedDRA_Version_No_C], [PT_ID_N])

ON DELETE CASCADE

GO

ALTER TABLE [dbo].[MD_HIERARCHY] CHECK CONSTRAINT [R_14]

GO

ALTER TABLE [dbo].[MD_HIERARCHY] WITH CHECK ADD CONSTRAINT [R_15] FOREIGN KEY([MedDRA_Version_No_C], [HLT_ID_N])

REFERENCES [dbo].[HLT] ([MedDRA_Version_No_C], [HLT_ID_N])

ON DELETE CASCADE

GO

ALTER TABLE [dbo].[MD_HIERARCHY] CHECK CONSTRAINT [R_15]

GO

ALTER TABLE [dbo].[MD_HIERARCHY] WITH CHECK ADD CONSTRAINT [R_16] FOREIGN KEY([MedDRA_Version_No_C], [HLGT_ID_N])

REFERENCES [dbo].[HLGT] ([MedDRA_Version_No_C], [HLGT_ID_N])

ON DELETE CASCADE

GO

ALTER TABLE [dbo].[MD_HIERARCHY] CHECK CONSTRAINT [R_16]

GO

ALTER TABLE [dbo].[MD_HIERARCHY] WITH CHECK ADD CONSTRAINT [R_17] FOREIGN KEY([MedDRA_Version_No_C], [SOC_ID_N])

REFERENCES [dbo].[SOC] ([MedDRA_Version_No_C], [SOC_ID_N])

GO

ALTER TABLE [dbo].[MD_HIERARCHY] CHECK CONSTRAINT [R_17]

GO

ALTER TABLE [dbo].[MD_HIERARCHY] WITH CHECK ADD CONSTRAINT [R_18] FOREIGN KEY([MedDRA_Version_No_C], [PT_SOC_ID_N])

REFERENCES [dbo].[SOC] ([MedDRA_Version_No_C], [SOC_ID_N])

ON DELETE CASCADE

GO

ALTER TABLE [dbo].[MD_HIERARCHY] CHECK CONSTRAINT [R_18]


But when I click on the constarinst folder, it's empty. However, these constrainst show up under Keys.

Can somebody tell me why? Does this tell me that keys and constraints are one and the same?

venki

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Here's the query for my Classes table:

Code:

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class_id
INT
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teacher_id
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class_title
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class_grade
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Code:

CREATE TABLE Classes_have_Grades
(
class_id
INT
PRIMARY KEY
NOT NULL,

teacher_id
INT
NOT NULL,

grade_id
INT
NOT NULL,

CONSTRAINT Grades_for_ClassesFKIndex1 FOREIGN KEY (grade_id)
REFERENCES Grades (grade_id),

CONSTRAINT Classes_have_gradesFKIndex2 FOREIGN KEY (class_id, teacher_id)
REFERENCES Classes (class_id, teacher_id)
)

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hi there,

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StudID char(4) NOT NULL,
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Week1 VARCHAR(10),
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Week3 VARCHAR(10),
Week4 VARCHAR(10),
Week5 VARCHAR(10),
Week6 VARCHAR(10),
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ALTER TABLE ATTENDANCE
FOREIGN KEY (moduleID) REFERENCES module(moduleID));



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insert into ATTENDANCE values
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insert into ATTENDANCE values
('F3','A3','E2','Yes','Yes','Yes','No','Yes','Yes');
insert into ATTENDANCE values
('F4','A4','E2','Yes','Yes','Yes','Yes','No','Yes');
insert into ATTENDANCE values
('F5','A5','E1''Yes','Yes','No','Yes','Yes','Yes');
insert into ATTENDANCE values
('F6','A6','E2','Yes','Yes','Yes','Yes','Yes','No');
insert into ATTENDANCE values
('F7','A7','E1','Yes','Yes','Yes','Yes','No','No');
insert into ATTENDANCE values
('F8','A8','E2','Yes','Yes','Yes','No','Yes','Yes');
insert into ATTENDANCE values
('F9','A9','E3','Yes','Yes','No','Yes','Yes','Yes');





CREATE TABLE MODULE
(ModuleID char(4) NOT NULL,
ATTENDANCEID char(4) NOT NULL,
ModuleName varchar(45),
ModuleCode varchar(6),
PRIMARY KEY (ModuleID));

ALTER TABLE MODULE
ADD FOREIGN KEY (attendanceID) REFERENCES attendance(attendanceID);


insert into MODULE values
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insert into MODULE values
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