Table1
id name country

2 xyz India
————————–
Table2

id aaa bbb ccc
2
2
—————————
Table 3

id xx yy zz
2
2

Table1
id name country
1 xyz US
2 xyz India
————————–
Table2

id aaa bbb ccc
1
2
—————————
Table 3

id xx yy zz
1
2

I am a beginner in SQLServer.i want to update and delete more then two tables
using merge concepts.so kindly let me send query asap….
Note:Tables are relate with foreign key,primary key constrains..

Thanks,

WHERE OBJECT_NAME(f.parent_object_id)= ‘tablename’

Your knowledge and examples are great. I get just the answers I’m looking for.

Thank you, thank you, thank you!

Drop the relationship/contstraint

What I want to do is create table and its relationships, but if I need to drop the parent table, I want to drop the respective relationships before hand.

Thanks.

select ISNULL(c.constraint_name,”) ConstraintName,

ISNULL(cfk.table_name ,”) FK_Table_name,

ISNULL(kcu.column_name ,”) FK_Column_name,

ISNULL(cpk.table_name ,”) PK_Table_name,

ISNULL(pkt.column_name ,”) PK_COlumn_name

from information_schema.REFERENTIAL_CONSTRAINTS c

INNER JOIN information_schema.TABLE_CONSTRAINTS cpk on c.unique_constraint_name = cpk.constraint_name

INNER JOIN information_schema.TABLE_CONSTRAINTS cfk on c.constraint_name = cfk.constraint_name

INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE kcu ON c.constraint_name = kcu.constraint_name

INNER JOIN
(
SELECT tci.table_name, kcui.column_name FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS tci
INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE kcui on tci.constraint_name = kcui.constraint_name
WHERE tci.CONSTRAINT_TYPE = ‘PRIMARY KEY’

) PKT ON PKT.TABLE_NAME = CPK.TABLE_NAME
GROUP BY c.constraint_name,cfk.table_name, kcu.column_name, cpk.table_name, pkt.column_name
HAVING count(pkt.column_name) = 1 and
cfk.table_name = ‘bp_bank’
ORDER BY 1,2,3,4

i am facing a problem while retreiving foreign keys.
i am passing foreign key table in below your query but i returns some extra columns or you can say some of its column’s data is beign duplicate.
how can i handle this?
thnxk

SELECT f.name AS ForeignKey,
SCHEMA_NAME(f.SCHEMA_ID) SchemaName,
OBJECT_NAME(f.parent_object_id) AS TableName,
COL_NAME(fc.parent_object_id,fc.parent_column_id) AS ColumnName,
SCHEMA_NAME(o.SCHEMA_ID) ReferenceSchemaName,
OBJECT_NAME (f.referenced_object_id) AS ReferenceTableName,
COL_NAME(fc.referenced_object_id,fc.referenced_column_id) AS ReferenceColumnName
FROM sys.foreign_keys AS f
INNER JOIN sys.foreign_key_columns AS fc
INNER JOIN sys.objects AS o ON o.OBJECT_ID = fc.referenced_object_id
ON f.OBJECT_ID = fc.constraint_object_id

If I remove the alias then the query would like following:

FROM sys.foreign_keys
INNER JOIN sys.foreign_key_columns
INNER JOIN sys.objects
ON sys.objects.OBJECT_ID = sys.foreign_key_columns.referenced_object_id
ON sys.foreign_keys.OBJECT_ID = sys.foreign_key_columns.constraint_object_id

Notice that both ON clause are on different tables.

Regards,
Pinal Dave

…
INNER JOIN
sys.foreign_key_columns AS fc
INNER JOIN
sys.objects AS o
ON o.OBJECT_ID = fc.referenced_object_id
ON f.OBJECT_ID = fc.constraint_object_id

sp_MSForEachDB ‘
if ”?” NOT IN (”tempdb”,”master”,”model”,”msdb”) USE ?
SELECT
DBName = DB_NAME()
,f.name AS ForeignKey
,SCHEMA_NAME(f.SCHEMA_ID) SchemaName
,OBJECT_NAME(f.parent_object_id) AS TableName
,COL_NAME(fc.parent_object_id, fc.parent_column_id) AS ColumnName
,SCHEMA_NAME(o.SCHEMA_ID) ReferenceSchemaName
,OBJECT_NAME(f.referenced_object_id) AS ReferenceTableName
,COL_NAME(fc.referenced_object_id, fc.referenced_column_id) AS ReferenceColumnName
FROM sys.foreign_keys AS f
INNER JOIN sys.foreign_key_columns AS fc
INNER JOIN sys.objects AS o ON o.OBJECT_ID = fc.referenced_object_id ON f.OBJECT_ID = fc.constraint_object_id
‘