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I have a table lets say calendar

Table Calendar --> idCal (int) , numberOfFields (int)

And each Calendar has asigned a number of fields

Table Field --> idField(int), textField(text), idCal (int) *fk

Point is right now, each time an user register, he is assigned a calendar, once the numberOfFields is populated, I select that value and generate an insert query similar to:

INSERT INTO Field (textField, idCal) Values ("","idOfTheGeneratedCalendar") , ("","idOfTheGeneratedCalendar") ...... 

Until I have a number of rows equivalent to numberOfFields from the table Calendar. Where each idField(int) begins at 0, and its an autoincrement up to whatever the numberOfFields is

I do that for each user. Point is... is there a better way to do this without building huge insert queries with aprox 3000 values each using a for iteration? Should I be concerned?

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you can use generate_series() for that:

insert into field (textfield, idcal)
select '', c.idcal
from calendar c
where idcal = 42
  cross join generate_series(1, c.numberoffields) as g(f)
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