CREATE TABLE ORDERS
(Order_ID integer primary key,
Order_Date datetime,
Customer_SID integer references CUSTOMER(SID),
Amount double);

CREATE TABLE ORDERS
(Order_ID integer primary key,
Order_Date datetime,
Customer_SID integer references CUSTOMER(SID),
Amount double);

The codes only display the column names but the foreign keys ar not displayed.

is there something i need to turn on?

How can i get unique key constains of table1.

thanks

I’ve a script that does the same but is a little less complicated I think:

SELECT TABLE_NAME, TABLE_SCHEMA, COLUMN_NAME, CONSTRAINT_NAME FROM INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE CCU
INNER JOIN sys.foreign_keys f
ON CCU.TABLE_NAME = object_name(parent_object_id) and CONSTRAINT_NAME = f.name
WHERE f.type = ‘F’
AND NOT EXISTS (
SELECT OBJECT_NAME(i.object_id) AS tablename,
i.name AS indexname,
a.name AS columnname
FROM sys.indexes i
INNER JOIN sys.index_columns c
ON i.object_id = c.object_id AND i.index_id = c.index_id
INNER JOIN sys.all_columns a
ON a.object_id = c.object_id AND a.column_id = c.column_id
WHERE CCU.TABLE_NAME = OBJECT_NAME(i.object_id)
AND CCU.COLUMN_NAME = a.name
)

ORDER BY CCU.TABLE_SCHEMA, CCU.TABLE_NAME, CCU.COLUMN_NAME

Very interesting article and of great help.
I made a little addition to your code. As I wanted also to know what the FKs are doing in the Table (referential integrity on update and on delete) I added two columns to your superb query. And a little bit of ordering :)
Maybe it helps other readers.

SELECT f.name AS ForeignKey,
OBJECT_NAME(f.parent_object_id) AS TableName,
COL_NAME(fc.parent_object_id,
fc.parent_column_id) AS ColumnName,
OBJECT_NAME (f.referenced_object_id) AS ReferenceTableName,
COL_NAME(fc.referenced_object_id,
fc.referenced_column_id) AS ReferenceColumnName,
f.update_referential_action_desc AS UpdateAction,
f.delete_referential_action_desc AS DeleteAction
FROM sys.foreign_keys AS f
INNER JOIN sys.foreign_key_columns AS fc
ON f.OBJECT_ID = fc.constraint_object_id
ORDER BY TableName ASC, ColumnName ASC

Your articles are always great source of information. Can u provide code i mean query to add FK on new table

Thanks
Tom

Your articles are always great source of information.

Kind Regards,

Azim

Thanks in advance for any and all criticisim.

George

select C.Table_Name,
C.Constraint_Name,
C.Constraint_Columns
from
(select object_name(i.object_id) table_name,
i.name index_name,
max(case index_column_id when 1 then col_name(ic.object_id,ic.column_id) else ” end)+
max(case index_column_id when 2 then col_name(ic.object_id,ic.column_id) else ” end)+
max(case index_column_id when 3 then col_name(ic.object_id,ic.column_id) else ” end)+
max(case index_column_id when 4 then col_name(ic.object_id,ic.column_id) else ” end)+
max(case index_column_id when 5 then col_name(ic.object_id,ic.column_id) else ” end)+
max(case index_column_id when 6 then col_name(ic.object_id,ic.column_id) else ” end)+
max(case index_column_id when 7 then col_name(ic.object_id,ic.column_id) else ” end)+
max(case index_column_id when 8 then col_name(ic.object_id,ic.column_id) else ” end)+
max(case index_column_id when 9 then col_name(ic.object_id,ic.column_id) else ” end)+
max(case index_column_id when 10 then col_name(ic.object_id,ic.column_id) else ” end) index_columns
from sys.index_columns ic,
sys.indexes i
WHERE ic.index_id = i.index_id
AND ic.object_id = i.object_id
AND OBJECTPROPERTY(i.OBJECT_ID,’IsUserTable’) = 1
AND i.index_id != 1
GROUP BY i.object_id, i.name) as I RIGHT OUTER JOIN
(select kcu.table_name,
kcu.constraint_name,
max(case kcu.ordinal_position when 1 then kcu.column_name else ” end)+
max(case kcu.ordinal_position when 2 then kcu.column_name else ” end)+
max(case kcu.ordinal_position when 3 then kcu.column_name else ” end)+
max(case kcu.ordinal_position when 4 then kcu.column_name else ” end)+
max(case kcu.ordinal_position when 5 then kcu.column_name else ” end)+
max(case kcu.ordinal_position when 6 then kcu.column_name else ” end)+
max(case kcu.ordinal_position when 7 then kcu.column_name else ” end)+
max(case kcu.ordinal_position when 8 then kcu.column_name else ” end)+
max(case kcu.ordinal_position when 9 then kcu.column_name else ” end)+
max(case kcu.ordinal_position when 10 then kcu.column_name else ” end) constraint_columns
from information_schema.key_column_usage kcu,
information_schema.referential_constraints rc
where rc.constraint_name = kcu.constraint_name
group by kcu.table_name, kcu.constraint_name) as C
on C.Table_Name = I.Table_Name
and I.Index_Columns like C.Constraint_Columns + ‘%’
where I.Table_Name is null