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Updating with INSERT INTO on Conflict Error

TWO QUESTIONS IN ONE:
Number one: This returns Failing row contains for name column and some more columns when trying to do it in SQL. However I know for a fact that the id allready exsist in the table. So how can I prevent it from giving this error?
Number two: The code returns error: syntax error at or near "$1" when ran in node? Is it beacuse values is a string and how can i prevent this?
This gives error error: syntax error at or near "$1". I have a feeling
let values = ("("+req.body.oldid+","+false+"),("+req.body.newid+","+true+")")
console.log(values) // returns (70,false),(4,true)
const results = await db.query("INSERT INTO practiceSite (id,frontpage) VALUES $1 ON CONFLICT DO UPDATE frontpage = values(frontpage);",[values])

Based on your use case, it looks like you'll only ever be inserting 2 entries at a time, so this should work.
In your example values is seen as a string, so we need to be more granular and pass in each parameter, and create the rows.
const results = await db.query(`
INSERT INTO practiceSite (id, frontpage)
VALUES ($1, FALSE), ($2, TRUE)
ON CONFLICT
DO UPDATE SET frontpage = EXCLUDED.frontpage;
`,
[req.body.oldid, req.body.newid]
)

Return inserted values from 'insert' query

I have simple table and I need to insert in to it values from array, but only values which are not exists in table and return from query inserted values, how I can do this?
I have next query, but it just inserts values:
INSERT INTO my_table(id, card_id, size)
VALUES ${myArray.map(item => `($${addDbValue(item.id, dbValues)},
$${dbValues.push(item.card_id)}::int, '24')`)}
`, dbValues)
unique is card_id

You seem to want on conflict and returning:
insert into my_table(id, card_id, size)
values (?, ?, ?)
on conflict (card_id) do nothing
returning *
The query inserts the new row, and returns the entire row (including columns that were not initially given for insert). If a row already exists with the same card_id, the insert is not performed (for this to work, you need a unique index or constraint on card_id).
Note that you should be using query parameters (as shown above) rather than concatenating variables in the query string. Have a look at the parameterized query feature of your client.

How to prevent the sequelize from creating the output clause

When I do a create using sequelize it returns me the response i.e. the newly created entry row in the response,
Sequelize Create Object Code:
let createdObj= await sequelize.ModelName.create(modelObject,{ transaction :t, //more options can be added here, need some value of option that prevents the output inserted })
Below is the query created:
INSERT INTO [TABLE_NAME] ([COL1],[COL2],[COL3],[COL4]) OUTPUT INSERTED.* VALUES (#0,#1,#2,#3,#4)
Now I don't want the output clause to be part of the query, I want a simple insert like:
INSERT INTO [TABLE_NAME] ([COL1],[COL2],[COL3],[COL4]) VALUES (#0,#1,#2,#3,#4)
I don't want the output clause to be part of the query.
How can I achieve this in at the query level as well as at the model level? In some Create operations, I want the output clause and in some create operations, I don't want.
EDIT 1
On Further research I found an option called { returning: false } this does what is required i.e. create an insert query like this INSERT INTO [TABLE_NAME] ([COL1],[COL2],[COL3],[COL4]) VALUES (#0,#1,#2,#3,#4) but now the Sequelize is breaking because it's expecting those values back in return idk why?
C:\Users\MG265X1\project\node_modules\sequelize\lib\dialects\mssql\query.js:389
id = id || results && results[0][this.getInsertIdField()];
^
TypeError: Cannot read property 'id' of undefined
at Query.handleInsertQuery (C:\Users\MG265X1\project\node_modules\sequelize\lib\dialects\mssql\query.js:389:39)
Turns out if an autoIncrementAttribute is present in the model, it will look for the output clause, removing the attribute {autoIncrement: true } from the model hasn't helped as IDENTITY_INSERT cannot be null. How do I move ahead on this??
Edit 2 I could get it working with a combination of { returning: false } and {hasTriggers: true}. Have hasTriggers Attribute as true in your Model, this will allow you to single creates but for bulk Creates pass option returning: false at the time of bulkCreate.
Note: When using bulkCreate with { returning: false } you'll not be able to get the autogenerated Id, It's a trade-off that we had to live with as we want
bulkCreate to work with triggers, we ended up fetching the Id later from DB
Seems I raised this issue but was closed as it wasn't good SSCCE

Objection.js How to use outer values in inner query?

I'm struggling with a somewhat more complex SQL Query which HAS TO BE in Objection.js.
Below is the code so far
const tagEntry = await Tag_overview.query()
.where('playable') //the playable column is a boolean
.whereExists(
InnerTableName.query().findById([<normal variable>, tag.id]) //<= tag.id is the id of the row in the outer query
)
)
.orderBy(raw('random()'))// this randomly orders the selection
.limit(1)
"tag.id" should be the value of the row in the top/outer query thats currently being checked. In SQL I'd solve it with a simple line like (< normal variable> is a Javascript variable passed into the query and can be trated as a hardcoded value, it and tagid are a compound key)
and EXISTS (SELECT tagid, othercolumn FROM kunstmakler_preselection WHERE tag.id = tagid AND <normal variable> = othercolumn)
But I have absolutely no clue how to do this in Objection.js. Yes, it needs an inner Query, but HOW do I pass this tag.id in there? I'm completely lost and neither the API Reference nor the Recipe Book is any help (found here: https://vincit.github.io/objection.js/recipes/ )
Is a join necessary here? Would it be worth it? [The tagoverview Table is rather small while "InnerTableName" is quite large]. I feel like that can't really be the solution since in ülain SQL it'd be such a smooth one liner

First make sure that you have declared composite key correctly in model InnerTableName https://vincit.github.io/objection.js/recipes/composite-keys.html
Then you should be able to do:
.whereExists(
InnerTableName.query().findById([theJsVariable, ref("Tag_overview.id")])
)

Cannot delete from mysql (file.size)

First I inserted a new record into a database with a field file_size. It all works fine. Then I want to delete the record with a given name and size from the database. It works with name, but when I add AND statement it doesnt work.
$conn->query("DELETE FROM mytable WHERE name LIKE '%{$t}' AND file_size = '$file_size'");
file_size is passed through $file_size= $_POST['size']; and it works correctly. The number in the database and the one passed is the same. I have no idea why the above doesnt work...at first I thought that maybe these are different data types and hence I am comparing string with integer, but in Javascript it shouldnt matter...Any advice would be greately appreciated.

Maybe prepare request
$query=$conn->prepare("DELETE FROM mytable WHERE name LIKE :like_param AND file_size = :filesize");
$query->excute(array(':like_param' => '%'.$t, ':filesize' => $file_size));