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27 sty 2009 · This little query returns all the 'drop foreign key' commands needed to drop all foreign keys into a particular table: SELECT 'ALTER TABLE ['+sch.name+'].['+referencingTable.Name+'] DROP CONSTRAINT ['+foreignKey.name+']' '[DropCommand]' FROM sys.foreign_key_columns fk JOIN sys.tables referencingTable ON fk.parent_object_id = referencingTable ...
6 lip 2013 · Here is the best way to find out Foreign Key Relationship in all Database. exec sp_helpconstraint 'Table Name' and one more way. select * from INFORMATION_SCHEMA.KEY_COLUMN_USAGE where TABLE_NAME='Table Name' --and left(CONSTRAINT_NAME,2)='FK'(If you want single key)
12 lut 2016 · To retrieve data from both table associated with foreign key i.e(common column) you have to join both the tables. if you matching data from both table then use INNER JOIN. > SELECT A.List_Of_columns,B.List_Of_columns FROM Table1 AS A INNER > JOIN Table2 as B ON A.ID=B.ID (Here Id is Common in both table).
19 sie 2024 · For example, let’s use the INFORMATION_SCHEMA views to list the foreign keys for the Registration table: SELECT FK.TABLE_NAME AS foreign_key_table, CU.COLUMN_NAME AS foreign_key_column, PK.TABLE_NAME AS referenced_table, PT.COLUMN_NAME AS referenced_column, C.CONSTRAINT_NAME AS constraint_name FROM INFORMATION_SCHEMA.
The FOREIGN KEY constraint is a key used to link two tables together. A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table. The following SQL creates a FOREIGN KEY on the "PersonID" column when the "Orders" table is created:
The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables. A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table.
This tutorial helps you understand SQL foreign key and show you how to define a foreign key using the FOREIGN KEY constraints.
