Error when trying to create a Trigger

Your SQL code is PL/SQL from/for Oracle database; don't work in T-SQL

Check out the SQL Server syntax of Trigger CREATE TRIGGER (Transact-SQL) - SQL Server | Microsoft Learn

Hello ,

This is not a valid syntax in SQL SERVER, looks like you're attempting more like MySQL or Oracle PL/SQL.

The BEFORE trigger and NEW-OLD pseudo records do not exist in SQL Server.

Here is a code in sql server you can use :

USE CORE_DATA;
GO

CREATE TRIGGER trg_copy_two_fields
ON dbo.OR_OP
AFTER UPDATE
AS
BEGIN
    SET NOCOUNT ON;

    UPDATE t
    SET FIXSTIME = i.STIME
    FROM dbo.OR_OP t
    INNER JOIN inserted i ON t.PrimaryKey = i.PrimaryKey
    INNER JOIN deleted d ON d.PrimaryKey = i.PrimaryKey
    WHERE d.STIME IS NULL AND i.STIME IS NOT NULL;
END
GO

Replace PrimaryKey with your actual primary key column.

To copy ETIME to FIXETIME, add below code

    SET FIXSTIME = i.STIME,
        FIXETIME = i.ETIME

I hope this will answer your query, if not let me know more about tool you are using.

Kind Regards,