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
Please check the value of SQLITE_MAX_TRIGGER_DEPTH. Could it be set to 1 instead of default 1000?
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
Related
I have a table in SQL Server that has 3 columns: ID, NAME, VALUE.
This table has 2 rows with ID=1 and ID=2.
(The value of ID doesn't change).
Every moment of time the value of column VALUE changes. Every time the column VALUE changes, I want to insert this updated value into a table (Device1 for ID=1, Device1 for ID=2).
I created a trigger for updating as if update(VALUE) begin...but it doesn't do the work.
Is there a way to add a condition in if update(VALUE) to work in each row
I used this query
Create Trigger insertIntoDevices
On ITEMS
For Update
As
If Update(VALUE)
Begin
Insert Into table device1
Where ID = 1
Insert Into table device2
Where ID = 2
End
With this query each update in column VALUE inserts VALUE into device1 and device1 and that duplicates values in my tables device1 and device2.
Table creation on the below ;
CREATE TABLE TestTable(
ID INT IDENTITY(1,1),
Name VARCHAR(5),
VALUE NVARCHAR(50)
)
GO
CREATE TABLE device1(
VALUE NVARCHAR(50)
)
GO
CREATE TABLE device2(
VALUE NVARCHAR(50)
)
GO
Insertion for ID=1 and ID=2
GO
INSERT INTO TestTable(Name,Value)
VALUES('Test1','test1'),('TEST2','test2')
Firstly,To find new values for each row you can use 'inserted' but it can be include non-changed data. For example: ID =1,Name='test1' and VALUE='test1' and updation of name column will be also included in inserted.
Secondly,To find old values for each row you can use 'deleted'.
After that we find the values that only includes updation for VALUE.
To Sump Up,
Finding Inserted rows and deleted rows will give us the result of each rows new and old values. We used intersection (INNER JOIN ) to find only changed values.
CREATE TRIGGER [dbo].[insertIntoDevices]
ON [dbo].[TestTable]
AFTER UPDATE
AS
BEGIN
DECLARE #InsertedTable table (
InsertedID INT,
InsertedName VARCHAR(5),
InsertedVALUE NVARCHAR(50)
)
DECLARE #DeletedTable table (
DeletedID INT,
DeletedName VARCHAR(5),
DeletedVALUE NVARCHAR(50)
)
INSERT INTO #InsertedTable(InsertedID,InsertedName,InsertedVALUE)
SELECT ID,[Name],[Value] FROM inserted;
INSERT INTO #DeletedTable(DeletedID,DeletedName,DeletedVALUE)
SELECT ID,Name,Value FROM deleted;
INSERT INTO device1(VALUE)
SELECT UpdatedValue = it.InsertedVALUE
FROM #InsertedTable as it
INNER JOIN #DeletedTable as dt ON it.InsertedID = dt.DeletedID AND ISNULL(dt.DeletedVALUE,'') <> ISNULL(it.InsertedVALUE,'')
WHERE it.InsertedID = 1
INSERT INTO device2(VALUE)
SELECT UpdatedValue = it.InsertedVALUE
FROM #InsertedTable as it
INNER JOIN #DeletedTable as dt ON it.InsertedID = dt.DeletedID AND ISNULL(dt.DeletedVALUE,'') <> ISNULL(it.InsertedVALUE,'')
WHERE it.InsertedID = 2
END
To test I used the updation queries on the below;
--Example 1
UPDATE TestTable
SET Value='selam'
WHERE ID = 1
--Example 2
UPDATE TestTable
SET Value='hi'
WHERE ID = 2
I have this row in the database table:
ID requiredQty
1088 30
And another table:
ID orderLineID bookedInQty
3000 1088 10
3001 1088 10
dbfiddle: https://dbfiddle.uk/?rdbms=sqlserver_2019&fiddle=9ecd8c83fcda08453481ec6d0ce45947
Summary
Total booked in quantity is total of 20 and 10 remaining for that particular order-line.
Question
How can I create an if statement to insert a record into the 2nd table, not to exceed table 1 requiredQty: 30?
Example
If insert bookedInQty: 11 this means it exceeds 30 because there is an extra 1. If it exceeds, simply do nothing.
If to insert bookedInQty: 9 this does not exceeds 30 because the total now equals to 29. Then insert this record.
Note
Without creating any extra tables, I am trying to do it using an if statement.
This uses if to check if the sum of the bookedQty and the new value are lower then the required quantity. You can put the code in a stored procedure.
create table table1(
id int NOT NULL,
requiredQty int
);
create table table2(
id int NOT NULL,
orderLineId int,
bookedInQty int
);
insert into table1(id, requiredQty) VALUES (1088, 30);
insert into table2(id, orderLineId, bookedInQty)
VALUES
(3000, 1088, 10),
(3001, 1088, 10);
declare #sumQty int, #newQty int, #newOrderLineId int;
select #newOrderLineId = 1088, #newQty = 11; -- change #newQty to 10 or lower
select #sumQty = sum(bookedInQty) from table2 where orderLineId = #newOrderLineId
group by orderLineId;
-- I hardcoded the value of id, it should add 1 to the maximum value or use an identity column
if exists(select * from table1 where id = #newOrderLineId and requiredQty >= #sumQty + #newQty)
insert table2 (id, orderLineId, bookedInQty) values (3002, #newOrderLineId, #newQty);
select * from table1;
select * from table2;
Dbfiddle demo:
https://dbfiddle.uk/?rdbms=sqlserver_2019&fiddle=d800624279381f9bbd71cf51bbc5351a
I'm using databases to connect with PowerApps and PowerBI and I had a question about triggers.
I have a table (Table A) that contains three columns: ID, TotalQty & Date. I would like to create a trigger based on the three main row actions: Insert, Delete & Update.
Example: New row is inserted into Table A from PowerApps (ID = 1000000 & TotalQty = 3 & Date = Today)
This should fire the trigger three times to insert a row into Table B (with rows ID, QrderQty, and Date):
ID = 1000000, OrderQty = 1 of 3, Date = Today
ID = 1000000, OrderQty = 2 of 3, Date = Today
ID = 1000000, OrderQty = 3 of 3, Date = Today
Similarly, if the date column is updated on Table A for this row, I need the three corresponding rows to update their respective date values as well. Or if the row in Table A is deleted, I need the three rows to be removed.
Could anybody give me an example query of this?
You need to create a Trigger first this link contains some tutorial on how to create a trigger.
Then according to your question you need to do some kind of loop for generating values for the OrderQty, I have done a while loop in this answer that exists as part of TSQL
Assuming that you create TableA and TableB with following schemas:
create table [dbo].[TableA]
(
ID integer not null,
TotalQty integer not null,
Date Date not null
)
go
create table [dbo].[TableB]
(
ID integer not null,
OrderQty nvarchar(10) not null,
Date Date not null
)
go
You can create the trigger as follows to do the job for you:
CREATE TRIGGER [dbo].[InsertFromAToB]
ON [dbo].[TableA]
AFTER INSERT
AS
BEGIN
Declare #counter as integer;
set #counter=1;
Declare #qty as integer;
set #qty = (Select TotalQty from inserted);
While(#counter <= #qty)
Begin
Insert into TableB(ID,OrderQty,Date) select ID,(CONVERT(nvarchar(10),#counter) + ' of ' + Convert(nvarchar(10),#qty)) as OrderQty,Date From inserted
set #counter=#counter+1;
END
END
I have a trigger I am working on that will insert rows into a table when another table has inserts or updates applied to it. So far the Update portion works (the column that I'm most concerned with is the Balance column), but when the first row is added for an insert on the Account table, in my AuditTrailCustomerBalance table OldBalance, NewBalance and CustNo are set to NULL. How can I get NewBalance and CustNo to reference to the values that were just inserted into the table from the trigger?
Here is the trigger:
ALTER TRIGGER AuditTrigger
ON Accounts
FOR INSERT, UPDATE
AS
IF UPDATE( Balance )
BEGIN
IF EXISTS
(
SELECT 'True'
FROM Inserted i
JOIN Deleted d
ON i.AccountID = d.AccountID
)
BEGIN
--1. Declare temp variables.
DECLARE #OldBalance NUMERIC( 18, 0 )
DECLARE #NewBalance NUMERIC( 18, 0 )
DECLARE #CustNo INT
--2. Set the variables.
SELECT #OldBalance = Balance FROM deleted
SELECT #NewBalance = Balance FROM inserted
SELECT #CustNo = CustNo FROM inserted
INSERT INTO AuditTrailCustomerBalance( TimeChanged, ChangedBy, OldBalance, NewBalance, CustNo )
VALUES( GETDATE(), SUSER_SNAME(), #OldBalance, #NewBalance, #CustNo )
END
END
GO
And the test statement:
INSERT INTO Custs( CustNo, GivenName, Surname, DOB, SIN )
VALUES( 1, 'Peter', 'Griffen', 'January 15, 1950', '555555555')
INSERT INTO Accounts( CustNo, Type, Balance, AccruedInt, WithdrawalCount )
VALUES( 1, 'Savings', 0, 0, 0 )
UPDATE Accounts SET Balance = 100
WHERE CustNo = 1
I believe that you want something like this:
ALTER TRIGGER AuditTrigger
ON Accounts
FOR INSERT, UPDATE
AS
INSERT INTO AuditTrailCustomerBalance(TimeChanged, ChangedBy,
OldBalance, NewBalance, CustNo )
SELECT GETDATE(), SUSER_SNAME(),
COALESCE(d.Balance,0), i.Balance, i.CustNo
FROM inserted i
left join
deleted d
on
i.AccountNo = d.AccountNo
WHERE
i.Balance <> d.Balance OR
d.Balance IS NULL
As I said in my comments, inserted and deleted can contain multiple rows (or no rows) and so you need to take that into account and write a set-based query that deals with all of those rows - also some rows may have had balance changes and some not - so deciding whether to write any entries based on UPDATE(Balance) was also flawed.
you can if you are sure of your code write something like this :
if (select count(*) from inserted) = 1
and execute your code.
You can for the insert do like this :
insert into AuditTrailCustomerBalance (.....)
select .... from inserted
as already posted, the problem with your trigger is in the calling if you update one row or multiple (same for insert)
I am trying to find a way to increment a second primary key column in a table automatically when a new entry is added for the first primary key column. I suppose an example would be best here so here goes.
Suppose I have a table:
CREATE TABLE T
(
SecNum INT NOT NULL,
EntryID INT NOT NULL,
Value FLOAT,
) CONSTRAINT [PK_T] PRIMARY KEY CLUSTERED
(
[SecNum] ASC,
[EntryID] ASC
)
I would run the following statement:
INSERT INTO T (SecNum, Value) VALUES (0, 10)
My table should look like:
SECNUM | ENTRYID | VALUE
-------------------------
0 0 10
I would run the following statement:
INSERT INTO T (SecNum, Value) VALUES (0, 10)
My table should look like:
SECNUM | ENTRYID | VALUE
-------------------------
0 0 10
0 1 10
I would run the following statement:
INSERT INTO T (SecNum, Value) VALUES (1, 20)
My table should look like:
SECNUM | ENTRYID | VALUE
-------------------------
0 0 10
0 1 10
1 0 20
This is possible using an INSTEAD OF trigger:
CREATE TRIGGER TriggerName
ON T
INSTEAD OF INSERT
AS
-- THIS TOP BIT IS OPTIONAL, IT WILL ALLOW ENTRY ID TO BE OVERRIDDEN IF
-- IT IS SUPPLIED TO THE INSERT AND WILL NOT VIOLATE THE PRIMARY KEY
IF NOT EXISTS
( SELECT 1
FROM T
INNER JOIN inserted i
ON i.SecNum = T.secNum
AND i.EntryID = T.EntryID
UNION
SELECT 1
FROM inserted
WHERE EntryID IS NULL
)
BEGIN
INSERT T (SecNum, EntryID, Value)
SELECT SecNum, EntryID, Value
FROM inserted
END
ELSE
-- IF OVERRIDE ABILITY IS NOT REQUIRED JUST USE THE BELOW INSERT
BEGIN
INSERT T (SecNum, EntryID, Value)
SELECT i.SecNum, COALESCE(LastID, 0), i.Value
FROM inserted I
LEFT JOIN
( SELECT SecNum, MAX(T.EntryID) + 1 [LastID]
FROM T
GROUP BY SecNum
) T
ON T.SecNum = i.SecNum
END
Example here
HOWEVER this is not very elegant. It could be worth asking is it really necessary? Could you get away with using a surrogate primary key, and use ROW_NUMBER() to create Entry ID's on the fly?
How about something like this:
INSERT INTO T (SecNum, Value, EntryId)
SELECT 0, 10, count(*)
FROM T WHERE SecNum = 0
It is not the cleanest solution and will perform pretty poorly too. But it should get the job done.
This is how to do it without storing the value in the table (I'm not sure why you want to store it)
TABLE
DECLARE #T TABLE
(
SecNum INT NOT NULL,
EntryID INT,
Value FLOAT
)
DATA
INSERT INTO #T
( SecNum, Value )
VALUES ( 0, 10 )
INSERT INTO #T
( SecNum, Value )
VALUES ( 0, 10 )
INSERT INTO #T
( SecNum, Value )
VALUES ( 1, 20 )
QUERY
SELECT SecNum,
ROW_NUMBER() OVER ( PARTITION BY value ORDER BY Value ) - 1 AS EntryID,
Value
FROM #T
RESULT
SecNum EntryID Value
0 0 10
0 1 10
1 0 20
If the EntryID changes with SecNum AND Value use this query:
SELECT SecNum,
ROW_NUMBER() OVER ( PARTITION BY Value,SecNum ORDER BY Value, SecNum ) - 1 AS EntryID,
Value
FROM #t
RESULT 2
SecNum EntryID Value
0 0 10
0 1 10
1 0 10
1 0 20
Your problem can be solved by using an instead of insert trigger
create trigger Trigger1 on T INSTEAD OF INSERT
as
begin
insert into T(SecNum,EntryID,Value)
select SecNum,
(select count(*) from T where SecNum = i.SecNum) as EntryID,
value
from inserted i
end