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How can i create a trigger to verify if new data exists on another table?

By : baka sura
Date : September 20 2020, 07:00 PM
will help you When using SQL, we don't check if data exists to be sure we won't add duplicates. We attempt to insert it and we place unique constraints. If the record exists, database tells us "No-no-no, it's already there" and that's it.
Solution to your problem is not a trigger, it's placing a unique index on item_name. Since item_name is probably a textual column (char, varchar, text), usual technique is to create an additional column that will contain the hash of item_name and you apply unique index to that one.
code :

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Creating a MySQL trigger to verify data on another table

By : opensure
Date : March 29 2020, 07:55 AM
this one helps. I am trying to set up a MySQL trigger that does the following: , If you have unique indexes you always can make an INSERT IGNORE
code :
 CREATE TRIGGER ins_bills AFTER INSERT ON databaseA.bills
          INSERT IGNORE INTO databaseB.bills (billNumber) VALUES (NEW.billNumber);
      END //

How can i create a trigger to verify if a record exists on another table?

By : Patrick Lolot de Alb
Date : March 29 2020, 07:55 AM
I hope this helps . I am using version 5.0 of mysql. , You have a couple of errors:
code :
delimiter //
        IF NEW.nameF not in (
            select A.nameF
            From Available A  -- CHANGED THE ALIAS TO A
            where (NEW.nameF = A.nameF and NEW.nameR = A.nameR)
        ) THEN -- MISSING THEN
           CALL `Insert not allowed`;

        END IF;
delimiter ; 

Create a virtual column to verify if data exists on anothers

By : Stepan Logvinov
Date : March 29 2020, 07:55 AM
should help you out mt_user:
code :
SELECT s.sttgs_id, s.sttgs_description, IF(st.uss_id,1,0) as `has it`
FROM mt_user u
JOIN mt_settings s
LEFT JOIN mt_user_settings us ON us.usr_id = u.usr_id AND us.sttgs_id = s.sttgs_id
WHERE u.usr_id = 2
SELECT s.sttgs_id, s.sttgs_description, IF(st.uss_id,1,0) as `has it`
FROM  mt_settings s
LEFT JOIN mt_user_settings us ON us.usr_id = 2 AND us.sttgs_id = s.sttgs_id

How to create a trigger to verify if a record is not exists?

By : Eva
Date : March 29 2020, 07:55 AM
Any of those help You don't need a trigger for this. You can implement this functionality as a unique key constraint:
code :
CREATE UNIQUE INDEX username_email ON MemberProfile (LoginName, Email);
ERROR 1062 (23000): Duplicate entry 'username-test@example.com' for key 'username_email'

Neo4j APOC verify trigger already exists

By : Alexandr Koshevoy
Date : March 29 2020, 07:55 AM
To fix this issue I use Neo4j APOC in order to install the following trigger: , There the apoc.trigger.list procedure for that :
code :
CALL apoc.trigger.list() yield name
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