Question

How can I create a SQLite Trigger to calculate running totals on the “Actual” table? The following SQL code should update the AccountBalances table so that the Balance column counts from 1, 2, 3, … rowcount. However, the trigger only updates the 2nd row, even when I turned on recursive_triggers. The result below is row 1 = 1, row 2 = 2, and rows after that are null.

CREATE TEMP TABLE "AccountBalances" (
  "Id" INTEGER PRIMARY KEY, 
  "DateId" INT,
  "AccountId" INT,
  "AccountCurrAmount" REAL,
  "Balance" REAL);

INSERT INTO "AccountBalances" 
  (DateId, AccountId, AccountCurrAmount)
  SELECT DateId, AccountId, Sum(AccountCurrAmount) 
    FROM Actual 
GROUP BY DateId, AccountId 
ORDER BY AccountId, DateId;

CREATE TRIGGER UpdateAccountBalance AFTER UPDATE ON AccountBalances
BEGIN
 UPDATE AccountBalances 
    SET Balance = 1 + new.Balance 
  WHERE Id = new.Id + 1;
END;

PRAGMA recursive_triggers = 'on';

UPDATE AccountBalances 
   SET Balance = 1 
 WHERE Id = 1

Answer 1

1. Please check the value of SQLITE_MAX_TRIGGER_DEPTH. Could it be set to 1 instead of default 1000?

2. Please check your SQLite version. Before 3.6.18, recursive triggers were not supported.

Please note that the following worked for me 100% OK

drop table “AccountBalances”

CREATE TEMP TABLE "AccountBalances" (
  "Id" INTEGER PRIMARY KEY, 
  "Balance" REAL);

INSERT INTO "AccountBalances" values (1,0)
INSERT INTO "AccountBalances" values (2,0);
INSERT INTO "AccountBalances" values (3,0);
INSERT INTO "AccountBalances" values (4,0);
INSERT INTO "AccountBalances" values (5,0);
INSERT INTO "AccountBalances" values (6,0);

CREATE TRIGGER UpdateAccountBalance AFTER UPDATE ON AccountBalances
BEGIN
 UPDATE AccountBalances 
    SET Balance = 1 + new.Balance 
  WHERE Id = new.Id + 1;
END;

PRAGMA recursive_triggers = 'on';

UPDATE AccountBalances 
   SET Balance = 1 
 WHERE Id = 1

select * from "AccountBalances";

Resulted in:

Id  Balance
1   1
2   2
3   3
4   4
5   5
6   6