Troubleshooting to implement SQL Server trigger - sql-server

Question

I have this table called InspectionsReview:
CREATE TABLE InspectionsReview
(
ID int NOT NULL AUTO_INCREMENT,
InspectionItemId int,
SiteId int,
ObjectId int,
DateReview DATETIME,
PRIMARY KEY (ID)
);
Here how the table looks:
+----+------------------+--------+-----------+--------------+
| ID | InspectionItemId | SiteId | ObjectId | DateReview |
+----+------------------+--------+-----------+--------------+
| 1 | 3 | 3 | 3045 | 20-05-2016 |
| 2 | 5 | 45 | 3025 | 01-03-2016 |
| 3 | 4 | 63 | 3098 | 05-05-2016 |
| 4 | 5 | 5 | 3041 | 03-04-2016 |
| 5 | 3 | 97 | 3092 | 22-02-2016 |
| 6 | 1 | 22 | 3086 | 24-11-2016 |
| 7 | 9 | 24 | 3085 | 15-12-2016 |
+----+------------------+--------+-----------+--------------+
I need to write trigger that checks before the new row is inserted to the table if the table already has row with columns values 'ObjectId' and 'DateReview' that equal to the columns values of the row that have to be inserted, if it's equal I need to get the ID of the exited row and to put to trigger variable called duplicate .
For example, if new row that has to be inserted is:
INSERT INTO InspectionsReview (InspectionItemId, SiteId, ObjectId, DateReview)]
VALUES (4, 63, 3098, '05-05-2016');
The duplicate variable in SQL Server trigger must be equal to 3.
Because the row in InspectionsReview table were ID = 3 has ObjectId and DateReview values the same as in new row that have to be inserted. How can I implement this?

Answer 1

With the extra assumption that you want to log all the duplicate to a different table, then my solution would be to create an AFTER trigger that would check for the duplicate and insert it into your logging table.
Of course, whether this is the solution depends on whether my extra assumption is valid.
Here is my logging table.
CREATE TABLE dbo.InspectionsReviewLog (
ID int
, ObjectID int
, DateReview DATETIME
, duplicate int
);
Here is the trigger (pretty straightforward with the extra assumption)
CREATE TRIGGER tr_InspectionsReview
ON dbo.InspectionsReview
AFTER INSERT
AS
BEGIN
DECLARE #tableVar TABLE(
ID int
, ObjectID int
, DateReview DATETIME
);
INSERT INTO #tableVar (ID, ObjectID, DateReview)
SELECT DISTINCT inserted.ID, inserted.ObjectID, inserted.DateReview
FROM inserted
JOIN dbo.InspectionsReview ir ON inserted.ObjectID=ir.ObjectID AND inserted.DateReview=ir.DateReview AND inserted.ID <> ir.ID;
INSERT INTO dbo.InspectionsReviewLog (ID, ObjectID, DateReview, duplicate)
SELECT ID, ObjectID, DateReview, 3
FROM
#tableVar;
END;