I have a master table , say mast_tbl, where every change on this table goes as a different entry into hst_mast_tbl. There is col in both the tables which talks about status change. Now if I want to track the number of records for which only the status has changed in the past 10 days, how can I achieve it in a simplest way?
To use lag function, sometimes there might be more column getting updated in master table so more than 1 record in my history table. So how can I achieve the same.
Thanks in advance.
Have you tried using triggers? If you are using SQL Server this might help you.
You can utilize the trigger by using FOR UPDATE when certain column is edited on your table you could say
CREATE TRIGGER [dbo].[trg_update] ON [dbo].[tbl_trans]
WITH EXECUTE AS CALLER
FOR UPDATE
AS
BEGIN
DECLARE #transaction VARCHAR(15)
DECLARE #action VARCHAR(10)
DECLARE #ref_id INT
DECLARE #trail_date DATETIME
SELECT
#transaction = '<your table here>',
#action = 'Update',
#ref_id = i.trans_id,
#trail_date = GETDATE()
FROM INSERTED i
INSERT INTO tbl_auditTrail (audit_trans,action,ref_id,trail_date)
VALUES (#transaction,#action,#ref_id,#trail_date)
END
GO
something like this.
Related
I'm going to create a trigger for update. Purpose of this trigger is that If muadurum column is changed , take the old value of mua_tarih in table fkayitlar and insert to another table mua_tarihleri.
My code block like;
ALTER TRIGGER [dbo].[trgr_fkayit_update]
ON [dbo].[fkayitlar]
AFTER UPDATE
AS
DECLARE #mua_durum_once NVARCHAR(10)
DECLARE #mua_durum_sonra NVARCHAR(10)
DECLARE #mua_tarih_once DATE
DECLARE #mua_yapan_once NVARCHAR(25)
DECLARE #kisi_id INT
Take the old value;
SELECT
#kisi_id=kayitid,
#mua_durum_once=muayenedurum,
#mua_tarih_once=muayenetarih,
#mua_yapan_once=mua_yapan
FROM deleted
Take the new value;
SELECT #mua_durum_sonra=muayenedurum FROM inserted
Check if value is changed ; if changed, Insert #mua_tarih to table mua_tarihleri with #kisi_id and #mua_yapan_once
IF #mua_durum_once='OLDU'
AND #mua_durum_sonra='OLMADI'
AND #mua_tarih_once IS NOT NULL
BEGIN
INSERT INTO mua_tarihleri(kayitid,mua_tarihi,mua_yapan)
VALUES(#kisi_id,#mua_tarih_once,#mua_yapan_once)
END
My problem is When I update more than one row in table fkayitlar,Trigger is working, but I see only one inserted row in table mua_tarihleri (only working once). I need to see more than one.(should be working more than once) Are not Triggers working on more than one process? or How can I solve this my problem?
The trigger only occurs once when the table is updated, no matter how many rows are updated. Therefore, you have to write your trigger body to operate on a set of rows, not a single row as you have done.
Should be something like:
ALTER TRIGGER [dbo].[trgr_fkayit_update]
ON [dbo].[fkayitlar]
AFTER UPDATE
AS
INSERT INTO mua_tarihleri(kayitid,mua_tarihi,mua_yapan)
SELECT deleted.kayitid, deleted.muayenedurum, deleted.muayenetarih, deleted.mua_yapan
FROM deleted
JOIN inserted ON deleted.kayitid = inserted.kayitid
WHERE deleted.muayenedurum='OLDU'
AND inserted.muayenedurum='OLMADI'
AND muayenetarih IS NOT NULL
I'm creating a table and setting up a trigger to insert/update field_3 using field_1 and 2. See my example below.
ID | Start_Date | End_Date | Period |
1 3/10/17 3/20/17 10
2 2/05/17 3/10/17 5
Trigger
ALTER TRIGGER [dbo].[tr_insert_Period]
ON [dbo].[MEDICAL_EXCUSE]
for update
AS
BEGIN
SET NOCOUNT ON;
declare #Start_Date Datetime
declare #End_Date Datetime
declare #Period Float
set #Start_Date = ( select me_start_date from inserted)
set #End_Date = ( select ME_End_Date from inserted)
set #Period = ( select Period from inserted)
update MEDICAL_EXCUSE
set #Period = DATEDIFF(day,#Start_Date , #End_Date)
END
it won't trigger just work if you execute Manually.
Any help Much Appreciated.
Don't use a trigger. Just use a computed column. I think this is what you want:
alter table KOPS_MEDICAL_EXCUSE
add period as (DATEDIFF(day, me_start_date, me_end_date));
Note that datediff() returns an integer, so there is no reason to declare anything as a float.
With a computed field, the value is usually calculated when you query the table. You can materialize the value if you want using the PERSISTED keyword.
Several issues I see with your trigger. First you can never assume only one record is going to be updated ever. Enterprise databases (typically the only kind complex enough to need triggers) often are accessed outside the user application and a large insert might appear.
Next, you want to get the records from an insert, so it needs to be an insert trigger. And finally you are updating the value of the variable #period instead of the field Period in your table.
Try this:
ALTER TRIGGER [dbo].[tr_insert_Period]
ON [dbo].[MEDICAL_EXCUSE]
for insert
AS
BEGIN
UPDATE ME
SET Period = DATEDIFF(day,i.Start_Date , i.End_Date)
FROM MEDICAL_EXCUSE ME
JOIN Inserted i on i.id = me.id
END
You might also want this to work for updates as well, so then make it:
FOR Insert, update
I am creating a stored procedure to create a new customer so for instance,
CREATE PROCEDURE Customer_Create
#customer_arg
#type_arg
AS
BEGIN
INSERT INTO Customer (Customer_id, Type_id)
VALUES (#Customer_arg,#type_arg)
End;
If I have several foreign keys in my statement and they are all ID's is there a way for me to pull the NEXT ID number automatically without having to know what it would be off the top of my head when I run the execute statement? I would like to just have it pull the fact that the ID will be 2 because the previous record was 1
EXECUTE Customer_Create 16,2
Is it something wnith output? If so how does this work code wise
I suspect that what you want to do is return the new id after the record is inserted. For that:
CREATE PROCEDURE Customer_Create (
#customer_arg,
#type_arg,
#NewCustomerId int output
) AS
BEGIN
INSERT INTO Customer(Customer_id, Type_id)
VALUES (#Customer_arg, #type_arg);
#NewCustomerId = scope_identity();
End;
There are several other choices for getting the identity, which are explained here.
To get to the last inserted IDENTITY value you should use the OUTPUT clause like this:
DECLARE #IdentValues TABLE(v INT);
INSERT INTO dbo.IdentityTest
OUTPUT INSERTED.id INTO #IdentValues(v)
DEFAULT VALUES;
SELECT v AS IdentityValues FROM #IdentValues;
There are several other mechanisms like ##IDENTITY but they all have significant problems. See my Identity Crisis article for details.
In your case you can also experiment with #IDENTITY like this
DECLARE #NextID int
--insert statement goes here
SET #NextID = ##Identity`
Here are couple good resources for getting familiar with this
http://blog.sqlauthority.com/2007/03/25/sql-server-identity-vs-scope_identity-vs-ident_current-retrieve-last-inserted-identity-of-record/
http://blog.sqlauthority.com/2013/03/26/sql-server-identity-fields-review-sql-queries-2012-joes-2-pros-volume-2-the-sql-query-techniques-tutorial-for-sql-server-2012/
I created computer audit application. When I ran my application, it shows computer accessories on browser like computerName, osVersion, lastAudit, model, totalMemory, processor, userName.
I have created a database in SQL Server 2008 with one table Computers. When a value is inserted into that table, I need to update the table value in the column. In an attempt to try this, I'm using a trigger. However, I do not fully understand how triggers work.
Can someone please show me how to accomplish this.
My table has these columns:
id, computerName, osVersion, lastAudit, model, totalMemory, processor, userName
I know that in this code something wrong or missing but I am not able to complete this. Please help me in this regard.
CREATE TRIGGER update_trigger
ON computers
AFTER UPDATE
AS
BEGIN
declare #id as int
declare #computerName as varchar(100)
declare #osVersion as varchar(100)
declare #lastAudit as datetime
declare #model as varchar(100)
declare #totalMemory float
declare #processor as varchar(100)
declare #userName as varchar(100)
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
if update(id)
BEGIN
insert into computers values(#id,#computerName,#osVersion,#lastAudit,#model,
#totalMemory,#processor,#userName,'Update')
SET NOCOUNT ON;
END
GO
If you want to simply update one or more columns of your existing table when new rows are being inserted (or when they are updated? Not quite clear...), try a trigger like this:
CREATE TRIGGER trigUpdateTable
ON dbo.Computers
AFTER INSERT -- or AFTER UPATE or AFTER INSERT, UPDATE
AS
BEGIN
-- do whatever you want to do on INSERT and/or UPDATE
UPDATE
dbo.Computers
SET
LastAudit = GETDATE()
FROM
dbo.Computers c
INNER JOIN
Inserted i ON c.id = i.id
One very important point to remember: SQL Server triggers are not called per row that is affected - but per statement, and if your INSERT or UPDATE statement affects multiple rows, you'll have multiple entries in the Inserted pseudo table and you need to be able to deal with that fact in your trigger
I want a SQL trigger to fire when a table is updated. I have a table called SimActivation and a stored procedure called spUpdateMnpDate that takes two parameters, msisdn(varchar) and date(datetime).
When the SimActivation table is updated I want to call the procedure with the new values.
Here is what I got at the moment, after changing it back and forth:
USE StoreSale;
GO
CREATE TRIGGER dbo.tSyncMnpDate
ON [dbo].[SimActivation]
AFTER UPDATE
AS
DECLARE #date datetime
DECLARE #msisdn varchar(10)
SET #date = (select ProcessDate from inserted)
SET #msisdn = (select Msisdn from inserted)
EXEC [spUpdateMnpDate]
#msisdn, #date;
GO
Can anyone point me in the right direction?
Thanks :)
The problem you have is that a trigger will fire when one or more rows have been updated. At the moment you are assuming your trigger will fire for each row, which is not the case in SQL Server.
If the stored procedure you are trying to call is fairly simple I'd pull the code out of there and in to the trigger. But remember you are working with sets of changed rows (even if the change is to only one row) so you have to write your SQL accordingly.
EDIT: I assume your procedure is updating a date where the PK is equal to #msisdn, if so you can do this in your trigger:
UPDATE Your_Table
SET Your_Table.ProcessDate = inserted.ProcessDate
FROM Your_table INNER JOIN inerted ON Your_Table.Msisdn = inserted.Msisdn
Joining the tables ensures it will work for one or many updated rows.