sql update trigger check if value has changed

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Rebeca
17 Jan 2021
1-- SQL Server (update my_table after update on my_table)
2CREATE TRIGGER trigger_name ON my_table AFTER UPDATE AS
3IF UPDATE (col_name)	-- Optional, for particular column
4BEGIN
5    UPDATE my_table SET my_col_date = getdate() FROM my_table 
6END;
7-- Oracle (insert into log table after update on my_table)
8CREATE OR REPLACE TRIGGER trigger_name AFTER UPDATE ON my_table
9FOR EACH ROW
10BEGIN
11    INSERT INTO my_log_table (LOG_DATE, ACTION) VALUES (SYSDATE, 'Changed');
12END;
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