question

That syntax looks like a mix of SQL Server and Oracle.

Anyway, that particular restriction is best implemented as a CHECK constraint:

ALTER TABLE HOC_reviews ADD ch_tbl_rating CHECK (rating BETWEEN 1 AND 5)

Key points for triggers in SQL Server:

• There are no BEFORE triggers. There are INSTEAD OF and AFTER triggers. The latter are easier to implement.
  

• A trigger once per statement; there is no per-row trigger.
  

• In a trigger for INSERT, you have access to the virtual table inserted, holds the newly inserted rows. The schema is the same as parent table for the trigger.
  

• Likewise, in trigger for DELETE, you have the virtual table deleted.
  

• And in a trigger for UPDATE, inserted holds the afterimage of the rows, and deleted has the beforeimage.

Hi @KristnaJuchov-7060
As Erland said, there is no 'Before' Trigger in SQL Sever. However, in this issue, you can use FOR/AFTER triggers. Refer to this article for more details: CREATE TRIGGER (Transact-SQL)
Check this example:

 IF OBJECT_ID('RATING_VALUE')IS NOT NULL
 DROP TRIGGER RATING_VALUE
 GO
    
 CREATE TRIGGER RATING_VALUE ON HOC_Reviews
 AFTER INSERT
 AS
 IF EXISTS(select 1 from inserted where RATING_VALUE not between 1 and 5) 
 BEGIN  
    RAISERROR('You can rate only from 1 to 5',10,1)
    ROLLBACK TRANSACTION;
    RETURN
 END; 

In addition,you can also implement this: if rating value > 5, then set it to 5.
Like this:

 IF OBJECT_ID('RATING_VALUE')IS NOT NULL
 DROP TRIGGER RATING_VALUE
 GO
    
 CREATE TRIGGER RATING_VALUE ON HOC_Reviews
 AFTER INSERT
 AS
 BEGIN  
    UPDATE HOC_Reviews SET RATING_VALUE = 5 WHERE RATING_VALUE > 5
 END; 

Best regards,
LiHong

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