请用SQL语句分别写出以下触发器1.被参照表针对删除操作的参照完整性触发器2.被参照表针对修改操作的参照完整性触发器3.参照表针对插入操作的参照完整性触发器4.参照表针对修改操作的参照完整性触发器

触发器是一种数据库对象，它可以在特定的数据库操作（如INSERT、UPDATE或DELETE）发生时自动执行。以下是对应的SQL语句：

1. 被参照表针对删除操作的参照完整性触发器：

CREATE TRIGGER trigger_name
ON referencing_table
AFTER DELETE
AS
BEGIN
    IF EXISTS (SELECT * FROM referenced_table WHERE referenced_column IN (SELECT referencing_column FROM deleted))
    BEGIN
        RAISERROR('Cannot delete row from referencing_table because it is referenced in referenced_table.', 16, 1)
        ROLLBACK TRANSACTION
    END
END

2. 被参照表针对修改操作的参照完整性触发器：

CREATE TRIGGER trigger_name
ON referencing_table
AFTER UPDATE
AS
BEGIN
    IF EXISTS (SELECT * FROM referenced_table WHERE referenced_column IN (SELECT referencing_column FROM inserted))
    BEGIN
        RAISERROR('Cannot update row in referencing_table because it is referenced in referenced_table.', 16, 1)
        ROLLBACK TRANSACTION
    END
END

3. 参照表针对插入操作的参照完整性触发器：

CREATE TRIGGER trigger_name
ON referenced_table
AFTER INSERT
AS
BEGIN
    IF NOT EXISTS (SELECT * FROM referencing_table WHERE referencing_column IN (SELECT referenced_column FROM inserted))
    BEGIN
        RAISERROR('Cannot insert row into referenced_table because it is not referenced in referencing_table.', 16, 1)
        ROLLBACK TRANSACTION
    END
END

4. 参照表针对修改操作的参照完整性触发器：

CREATE TRIGGER trigger_name
ON referenced_table
AFTER UPDATE
AS
BEGIN
    IF NOT EXISTS (SELECT * FROM referencing_table WHERE referencing_column IN (SELECT referenced_column FROM inserted))
    BEGIN
        RAISERROR('Cannot update row in referenced_table because it is not referenced in referencing_table.', 16, 1)
        ROLLBACK TRANSACTION
    END
END