I have a trigger to conditionally GROUP_CONCAT a few columns. I can remove duplicates from within a single column, but Iām struggling to remove duplicates between two or more columns. Current trigger (two column example): Fiddle: https://dbfiddle.uk/?rdbms=mysql_8.0&fiddle=46a6bb915fa7e2e9106b073677eee6cd Answer Change the second Select to ā ā id | selection1 | selection2 | results -: | :——— | :——— | :—— 1
Tag: triggers
SQL Trigger with loop from another table
I’ve got 2 tables : Table A Table B The table A contains the following values : The Table B contains the following values : My goal is to set the column B.chk with the number of occurence from table A when a new row is created on table B. For example : The trigger on table B should set
Trigger to check if the combination of two field exist
I want to create a trigger which will check if my showtime with Cinema Hall Id exist or not. This will prevent me from booking one Cinema hall at two same Showtimes. Secondly in this trigger I am also checking if the showtime I am assigning to movie lies in movie release and last date range or not. But I
How can I make the trigger return a value?
I have a ‘roomstate’ table that represents states that I keep updated. This is what happens when the employee assigns room 2 to customer 1 whose booking_id is 2. As the table above is continuously updated, the existing contents may become NULL again. I’d like to have a record of updating this in another table. example : So, I used
How can I make my sql trigger about inappropiate words work
I have a database with different tables in order to store photos, users, reviews, ratings… I wanna validate that no one uses “bad words” (insults) in their photos’ title or description. So I decided to create a table called ‘inappropiatewords’ where all of these bad words will be stored and then I made the following trigger: But when I try
Creating a trigger that records modifications on table A by inserting values in table B
I’m having problems with the following trigger that records when an insertion with attribute ‘numero’= 4 is made on table A by inserting into table B who made the modification and the number of …
Do I need to set XACT_ABORT to ON in every trigger?
This was an old SQL Server 2008 Express database (five of them actually) that I just migrated to SQL Server 2019 Express. Everything seemed to be working fine until my crew got in and we were getting an error everywhere. Turns out we had RAISEERROR in the triggers, and even though my compatibility appears to be set to 2008 (100),
identifier ‘NEW.CITY_POPULATION’ must be declared
I am trying to declare a oracle trigger that will update the city name when the city population reaches 0 but I am getting this error. Answer If you’re going to reference the :new pseudo-record in a trigger body, it needs to be prefixed with a colon. A trigger on cities generally cannot query the cities table. In this case,
T-SQL Trigger – Audit Column Change
Given a simple table, with an ID what is the correct way to audit a column being changed. I am asking after looking after various answers which seem not to be working. Here is what I have: Create …
ORA-04091 TABLE ODB.EMPLOYEE IS MUTATING, TRIGGER/FUNCTION MAY NOT SEE IT. IS THERE SOMETHING WRONG WITH MY TRIGGER?
Trying to create a trigger when there is an update of Status on Employee Table and capture some values for the record in Employee table and Employee_Header table for that record and send an email. The trigger throws an error. Answer You can’t select from a table which is just being changed; it is mutating. Though, as you can use