I am able to manually execute the following code: However, if I try creating a Trigger with the same code as above, I get this error when creating a new user in my database: Can’t update table ‘members’ in stored function/trigger because it is already used by statement which invoked this sto…
Tag: triggers
How can I insert a value from another table to another on insertion?
I have this table called users. Whenever I sign up a user, I generate an UUID for him. When this UUID is generated I want to insert a row in another table called health, with the same UUID that was inserted on the users table. I was trying to make this way, but I can’t make it work: I’m having
Why my after update trigger is executing on insert although I have separate trigger for insert as well
Answer First of all – for the INSERT – I would use a DATETIME2(3) column with a default constraint – then you do not need a trigger: Now, each time you insert a row and you do not specify the dtEnter column in your list of columns to insert values into – it will automatically be set by…
sql prevent double booking with trigger
I am stumbled on constructing a DB table for hotel reservations. In my reservation db, there is a reservation start_datetime and end_datetime attribute to indicate booked period and I tried to prevent double booking with a trigger statemen, but I am certain that this method would be vulnerable to race conditi…
Is there any way we can emulate the way of using :old and :new of row triggers in statement triggers in PL/SQL
Good Day Buddies! So, here is my Question, it says – Write a update, delete trigger on clientmstr table. The System should keep track of the records that ARE BEING updated or deleted. The old value of updated or deleted records should be added in audit_trade table. (Separate implementation using both ro…
Trigger to create or update records in another table
Edit: This question is mostly solved. What I am still trying to do might require a different approach. I am adding a trigger to a legacy database table, in order to automatically create new records for a related table. This is not homework. Here is my DB Fiddle on SQL Server 2017. https://dbfiddle.uk/?rdbms=s…
Compound trigger to insert into another table after insert or update into the main table
I’m working on a compound trigger and I’m having difficulties figuring out how to make it work. The trigger is on the person table. There is a column woman_act. If a new row is inserted and that column is not null than we need to insert that row into the v_changes table or if that column is update…
Triggers data retention in inserted table and combination of update and insert on one column
I have a table in SQL Server which houses snapshots of all data to track changes in status of the source table tbl_D_project. If this status changes or a new record is added in tbl_D_project, a trigger should start and the line will be copied to the snapshot table. I wrote two triggers based on another questi…
How to solve deadlock when inserting rows in sql many-to-many relationship with minimum cardinality one restriction?
This year I’ve been learning about relational databases and how to design them. In order to strenghten my knowledge, I’m trying to design and implement a database using Python and sqlite3. The database is about a textile company, and, among other thigs, they want to keep information about the foll…
Trigger to detect whether DELETE or UPDATE is called by stored proc
I have a scenario where certain users must have the rights to update or delete certain records in production. What I want to do put in a safeguard to make sure they do not accidentally update or delete a large section (or entirety) of the table, but only a few records as per their need. So I wrote a simple