Table Creation Script for Parent and Child with FOREIGN KEY Constraint and INSTEAD OF Trigger : Create Table « Table « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Table » Create Table 
3. 1. 3. Table Creation Script for Parent and Child with FOREIGN KEY Constraint and INSTEAD OF Trigger
4CREATE TABLE Parent(
5>   ID int NOT NULL PRIMARY KEY
6)
7> GO
1CREATE TABLE Child(
2>   ID int NOT NULL PRIMARY KEY REFERENCES Parent (IDON DELETE CASCADE
3)
4> GO
1CREATE TRIGGER trd_Parent ON Parent INSTEAD OF DELETE
2> AS
3> IF @@ROWCOUNT = 0
4>   RETURN
5> PRINT 'Inside Parent trigger.'
6> GO
1INSERT Parent VALUES (1)
2INSERT Parent VALUES (2)
3INSERT Parent VALUES (3)
4INSERT Parent VALUES (4)
5> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)
1INSERT Child VALUES (1)
2INSERT Child VALUES (2)
3INSERT Child VALUES (3)
4INSERT Child VALUES (4)
5> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)
1> --INSTEAD OF Trigger that Duplicates DELETE Action
2> ALTER TRIGGER trd_Parent ON Parent INSTEAD OF DELETE
3> AS
4> IF @@ROWCOUNT = 0
5>   RETURN
6> PRINT 'Inside Parent trigger.'
7DELETE P
8FROM
9>     Parent P
10>    JOIN
11>      deleted D ON D.ID = P.ID
12>  GO
1> -- AFTER Trigger on Child Table
2CREATE TRIGGER trd_Child ON Child AFTER DELETE
3> AS
4> IF @@ROWCOUNT = 0
5>   RETURN
6> PRINT 'Inside Child trigger.'
7> GO
1>
2> drop table child
3> drop table parent
4> GO
1>
3. 1. Create Table
3. 1. 1. The basic syntax of the CREATE TABLE statement
3. 1. 2. PRIMARY KEY column
3. 1. 3. Table Creation Script for Parent and Child with FOREIGN KEY Constraint and INSTEAD OF Trigger
3. 1. 4. Computational column
3. 1. 5. CLUSTERED column
3. 1. 6. A statement that creates a table with column attributes
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