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How Mysql trigger for new values?


How Mysql trigger for new values?

By : user2950461
Date : November 17 2020, 11:55 AM
should help you out You won't be be able to do that with a trigger in MySQL but most importantly you don't have to.
Assuming that language codes are coming from another table, let's say language_codes you can prepopulate the rows for all language codes at once with one SQL statement
code :
INSERT INTO table1 (const, text, i18n_language_codes_id)
SELECT 'NEW_CONST', 'New Text', i18n_language_codes_id
  FROM language_codes


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Mysql Trigger - when specific column values change then run trigger

Mysql Trigger - when specific column values change then run trigger


By : S. Fei
Date : March 29 2020, 07:55 AM
it fixes the issue You can set a trigger on UPDATE and then inside the trigger check to see if the specified column was changed
code :
CREATE TRIGGER sample_trigger AFTER UPDATE ON product_deals
FOR EACH ROW
BEGIN
  IF NEW.final_price <> OLD.final_price THEN
    // put your code here
  END IF
END;
MYSQL Change Values based on Table values (Constraint or Trigger?)

MYSQL Change Values based on Table values (Constraint or Trigger?)


By : timohaire
Date : March 29 2020, 07:55 AM
I hope this helps you . You could use these two triggers, one for the UPDATE, one for the INSERT:
code :
CREATE TRIGGER upd_yourtable BEFORE UPDATE ON yourtable 
FOR EACH ROW
  SET new.licenseStatus=
      CASE WHEN new.hourLog>0 THEN 'Valid' ELSE 'INVALID' END
;

CREATE TRIGGER ins_yourtable BEFORE INSERT ON yourtable 
FOR EACH ROW
  SET new.licenseStatus=
      CASE WHEN new.hourLog>0 THEN 'Valid' ELSE 'INVALID' END
;
Get column name and values for MySQL trigger

Get column name and values for MySQL trigger


By : JOE
Date : March 29 2020, 07:55 AM
will be helpful for those in need I'm beginner with MySQL and I'm trying to create a log trigger that fills a log table like this: , You have to do this the painful way, one at a time:
code :
if not (old.col1 = new.col1 or old.col1 is null and new.col1 is null)
    INSERT INTO user_log(action, id, timestamp, column_name, old_value, new_value)
        VALUES('update', NEW.id, NOW(), 'col1', OLD.col1, NEW.col1);
end if;
if not (old.col2 = new.col2 or old.col2 is null and new.col2 is null)
    INSERT INTO user_log(action, id, timestamp, column_name, old_value, new_value)
        VALUES('update', NEW.id, NOW(), 'col2', OLD.col2, NEW.col2);
end if;
. . . 
Conditional values in MySQL Trigger

Conditional values in MySQL Trigger


By : user3420680
Date : March 29 2020, 07:55 AM
Any of those help I have a question about MySQL triggers—say I have the following table: , Then trigger it is:
code :
DELIMITER $$
CREATE TRIGGER value_check BEFORE INSERT ON test
FOR EACH ROW
BEGIN
  IF NEW.value_1 IS NOT NULL AND NEW.value_2 IS NOT NULL THEN
    SET NEW.values_were_set = 1;
  ELSE
    SET NEW.values_were_set = 0;
  END IF;
END;
$$
Mysql trigger that multiplies two values from different tables, totalizes by groups and adds values to another column

Mysql trigger that multiplies two values from different tables, totalizes by groups and adds values to another column


By : רועי סופר
Date : March 29 2020, 07:55 AM
hop of those help? I've been going around this for a while and there isno way I can figure it out. Let's say I have these three tables: , One approach is to join the relevant tables:
code :
SELECT u.name, SUM(i.amount*m.price)
FROM users u 
JOIN items i ON u.name = i.user
JOIN market_prices m ON i.item = m.item
GROUP BY u.name;
UPDATE users 
SET basket_value = (SELECT basket FROM
   (SELECT name, SUM(i.amount*m.price) AS basket
   FROM users u JOIN items i ON u.name = i.username 
   JOIN market_prices m ON i.item = m.item
   GROUP BY u.name) q1 WHERE q1.name = users.name);
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