I have this small program in C# that is constantly sending data to one of my tables (DataTable). The data format is always the same as well as the length.
There are 4 different IDs I am working with here: 2000,2001,2002, ...which are all in a different table. The ID column is the foreign key in my DataTable column.
Initially I thought I could just retrieve the last inserted row in my DataTable for a specific ID. However, I realized that the insert statement does allocate the values into the database in the order they are sent. Therefore, I decided to simply take an ID and get the last row of data based on the timestamp.
I have tried using DatePart but this limits me to only hours. I would want to display a time based on hours and min. ex: 2002 between '4:30:00' and '5:30:00'.
Also, would I have to do a join statement since I would be calling the ID column from another table?
Ive tried this so far: `
use LogDatabase
select * from dbo.DataTable
join CustomerTable
on(Customer_ID = CustIDFk)
where DATEPART(HH, TimeStamp)between 4 and 5 `
The incoming data string looks alot like this:
3-13-2011 3:30:21 2002: 45 Temp:81 Albany NY etc....
I have made columns for the every field of data in my DataTable. As you can see
2002 is the ID which is called Customer_ID in my CustomerTable. I have set this
as my primary key in the CustomerTable and CustIDFk is the foreign key to be linked
with Customer_ID. As you can see, I'm trying to join my Customer table with my Data
table in order to specify the ID. The DATEPART statement allows to give a time range
by either hour or min among others but does not allow a "between 4:30 and 5:30.
Would something like this work?
DECLARE #today DATETIME = CAST(FLOOR(CAST(GETDATE() AS FLOAT)) AS DATETIME)
SELECT *
FROM dbo.DataTable
WHERE TIMESTAMP BETWEEN DATEADD(mi, 30, DATEADD(hh, 4, #today)) AND DATEADD(hh, 5, #today)
Related
I'm basically very new to SQL Server, so please bare with me. Here is my problem:
I have a table with (let's say) 10 columns and 80k rows. I have 1 column called Date in the format of YYYY-MM-DD type varchar(50) (can't convert it to date or datetime type I tried, the initial source of data is not good).
**Example :
Table [dbo].[TestDates]
Code
SellDate
XS4158
2019-11-26
DE7845
2020-02-06
What I need to do is to turn the YYYY-MM-DD format to DD/MM/YYYY format. After a lot of tries (I tried the functions (DATE_FORMAT, CONVERT, TO_DATE etc) and this is solution :
1- I added a primary key for join purpose later (ID)
2- I split my date column in 3 columns in a whole new table
3- I merged the 3 columns in the order I need with the delimiter of my choice (/) in the same new table
4- I copied the good column to my initial table using the primary key ID I created before
alter table [dbo].[TestDates]
add ID int not null IDENTITY primary key;
SELECT ID,
FORMAT(DATEPART(month, [SellDate]),'00') AS Month,
FORMAT(DATEPART(day, [SellDate]),'00') AS Day,
FORMAT(DATEPART(year, [SellDate]),'0000') AS Year
INTO [dbo].[TestDates_SPLIT]
FROM [dbo].[TestDates]
GO
ALTER TABLE [dbo].[TestDates_SPLIT]
ADD SellDate_OK varchar(50)
UPDATE [dbo].[TestDates_SPLIT]
SET SellDate_OK = [Day] + '/' + [Month] + '/' + [Year]
ALTER TABLE [dbo].[TestDates_SPLIT]
DROP COLUMN Month, Day, Year
ALTER TABLE [dbo].[TestDates]
ADD SellDate_GOOD varchar(50)
UPDATE [dbo].[TestDates]
SET [TestDates].SellDate_GOOD = [TestDates_SPLIT].SellDate_OK
FROM [dbo].[TestDates]
INNER JOIN [dbo].[TestDates_SPLIT]
ON [TestDates].ID = [TestDates_SPLIT].ID
This code works but i find too heavy and long, considering I have 6 more dates columns to work on. Is there a way to make it shorter or more efficient? Maybe with SET SellDate = SELECT (some query of sorts that doesn't require to create and delete table)
Thank you for your help
I tried the usual SQL functions but since my column is a varchar type, the converting was impossible
You should not be storing dates as text. But, that being said, we can try doing a rountrip conversion from text YYYY-MM-DD to date to text DD/MM/YYYY:
WITH cte AS (
SELECT '2022-11-08' AS dt
)
SELECT dt, -- 2022-11-08
CONVERT(varchar(10), CONVERT(datetime, dt, 121), 103) -- 08/11/2022
FROM cte;
Demo
I have spent many hours researching this problem and trying various solutions but I never quite find a suitable solution for my specific problem. I am new to SQL and some of the examples are confusing as well.
So here is my dilemma. I have a equipment table that tracks oil changes for specific units in a database. The table looks like this:
**id UnitID Posted_On Date_Completed Note OverDueBy**
1 BT-109F 2019-02-04 2019-02-14 Hrs Overdue 23
1 BT-108G 2020-01-17 2020-01-22 Days Overdue 12
1 BT-122K 2020-01-02 2020-01-16 Days Overdue 12
1 BT-109F 2019-02-04 Days Overdue 3
The example records above need to be created or updated by the query. The date completed is entered manually by the technician when he has completed the oil change.
What I want the query to do is, Check to see if a specific Unit has a record where the 'Date_Completed' field is empty, and if so update the 'OverDueBy' field to reflect the new value. If all the records for the specified Unit have the 'Date_Completed' fields filled in, then the query should create a new record will all fields filled in except for the 'Date_Completed' field.
Can anyone help me construct such a query?
Thanks
Clan
First create a unique partial index for the column UnitID:
CREATE UNIQUE INDEX idx_unit ON tablename(UnitID)
WHERE Date_Completed IS NULL;
so that only 1 row with Date_Completed=null is allowed for each UnitID.
So a statement like this:
INSERT INTO tablename(id, UnitID, Posted_On, Date_Completed, Note, OverDueBy)
VALUES (?, 'BT-109F', ?, null, ?, ?)
ON CONFLICT(UnitID) WHERE Date_Completed IS NULL DO UPDATE
SET OverDueBy = ?;
will insert the new values only if there is no row already for UnitID='BT-109F' with null in Date_Completed.
But if there is such a row then it will update the column OverDueBy.
I'm not sure what values you want to insert or what will be the updated value so replace the ? with the appropriate values.
Firstly I would use a view rather than a table to store any calculated data - it reduces storage overheads and will update the calculation every time the view is opened.
If you're using SQLite you should be able to get the overdue by subtracting the Posted_On from its function to return today's date something like date('now') or julianday('now') - read up on and test the functions to ensure it does what you want.
So along the lines of:-
create view MyView as select *, julianday('now') - julianday(Posted_On) as OverDueBy from ClansTable where Date_Completed is null;
If you want to store a snapshot you can always create a table from a view in any case:-
create table MyStoredOverduesOn4thFeb as select * from MyView;
You can find your units that have all Date_Completed and create a single new record like so:-
Create table CompletedUnits as select id, UnitID, max(posted_on) as latest_posted_on, '' as Date_Completed from ClansTable group by id, UnitID having count(*) = count(Date_Complete);
Test this SQL and see if you can get it working - note I've created a text field for the date. Apparently there is no date/datetime data type as such:-
https://www.sqlitetutorial.net/sqlite-date/
Hope this helps,
Phil
I think you need something like this:
MERGE INTO EQUIPMENT A
USING (SELECT * FROM EQUIPMENT B WHERE DATE_COMPLETED IS NULL) C
ON (A.UNITID=C.UNITID)
WHEN MATCHED THEN UPDATE SET A.OVERDUEBY="new value"
WHEN NOT MATCHED THEN INSERT (A.id,A.UnitID,A.Posted_On,A.Date_Completed,A.Note,A.OverDueBy)
VALUES (C.id,C.UnitID,C.Posted_On,NULL,C.Note,C.OverDueBy)
Not sure where new values from update will come from. It's not clear in your question. But something like this could work.
i am using sql server in making my project with javafx. Their i have a table of purchase and sale. One of the column of both of them is date having current date and time to store them as a record that this transaction has been saved in this time.
Now i am using the that date column with varchar datatype and have using computed column specification with following function:
(CONVERT([varchar](25),getdate(),(120)))
but when i select records from that table using query
SELECT pr.Date, p.Name, pr.Quantity, s.Name, p.Pur_Price
FROM (([Product] AS p
INNER JOIN [Purchase] AS pr ON pr.Product_id=p.Product_id)
INNER JOIN [Supplier] AS s ON s.Supplier_Id=p.Supplier_Id)
WHERE pr.Date>= dateadd(dd, 0, datediff(dd, 0, getdate()-30))
but it selects all the records keeping all date records to current date and time. Thanks in advance.
Looking forward for your good replies.
The problem is that your Date column is computed on the fly and not actually stored in the table. So each time you SELECT from that table, the expression of the computed column is calculated (CONVERT([varchar](25),getdate(),(120))) thus resulting in the same value for all rows.
A fix would be using a PERSISTED computed column so that values are actually stored with the table when inserting or updating:
CREATE TABLE Product (
OtherColumns INT,
[Date] AS (CONVERT([varchar](25), getdate(), 120)) PERSISTED)
The problem with this is that non-deterministic expressions can't be persisted, as this error message pops up:
Msg 4936, Level 16, State 1, Line 1 Computed column 'Date' in table
'Product' cannot be persisted because the column is non-deterministic.
You have several other options for this. Please use DATE or DATETIME columns to store and handle dates and avoid using VARCHAR for this as it brings many problems. The following examples use DATETIME:
Use a DEFAULT constraint linked to the column with the expression you want:
CREATE TABLE Product (
OtherColumns INT,
[Date] DATETIME DEFAULT GETDATE())
INSERT INTO Product (
OtherColumns) -- Skip the Date column on the INSERT
VALUES
(1)
SELECT * FROM Product
OtherColumns Date
1 2018-12-14 08:49:08.347
INSERT INTO Product (
OtherColumns,
Date)
VALUES
(2,
DEFAULT) -- Or use the keyword DEFAULT to use the default value
SELECT * FROM Product
OtherColumns Date
1 2018-12-14 08:49:08.347
2 2018-12-14 08:50:10.070
Use a trigger to set the value. This will override any inserted or updated value that the original operation set (as it will execute after the operation, as stated in it's definition).
CREATE TRIGGER utrProductSetDate ON Product
AFTER INSERT, UPDATE
AS
BEGIN
SET NOCOUNT ON
UPDATE P SET
Date = GETDATE()
FROM
inserted AS I
INNER JOIN Product AS P ON I.OtherColumns = P.OtherColumns -- Assuming PK or Unique columns join
END
Thanks all of you. But i solved my problem by putting my date Column of that table into datetime data type and i my query i have entered the date using getdate() method. It worked for me to save current date and time in my purchase and sale table.
I have a task to automatically bill all registered patients in PatientsInfo table an Annual Bill of N2,500 base on the DateCreated column.
Certainly I will use a stored procedure to insert these records into the PatientDebit table and create a SQL Job to perform this procedure.
How will I select * patients in PatientsInfo table where DateCreated is now 1 yr old for me to insert into another table PatientDebit.
I have my algorithm like this:
select date of registration for patients from PatientsInfo table
Add 1 year to their DateCreated
Is date added today? if yes,
Insert record into PatientDebit table with the bill of N2,500
If no, do nothing.
Please how do I write the script?
Use DATEADD, i.e.:
SELECT DATEADD(year, 1, '2006-08-30')
Ref.: http://msdn.microsoft.com/en-us/library/ms186819.aspx
Assuming the columns of the 2 tables are the same:
INSERT INTO PatientDebit
SELECT * from PatientsInfo WHERE DateCreated<DATEADD(year, -1, GETDATE())
Make sure you have an index on DateCreated if PatientsInfo has a lot of records as it could potentially be slow otherwise
there should be .add or addyear() function in sql. You add like .add(year, day, month). Read upon sql datetime add year, month and seconds. It is pretty straightforward. It is just like c#.
Dateadd(info). now time is. getdate().
I need to create a stored procedure that upon exceution checks if any new rows have been added to a table within the past 12 hours. If not, an warning email must be sent to a recipient.
I have the procedures for sending the email, but the problem is the query itself. I imagine I'd have to make an sql command that uses current date and compares that to the dates in the rows. But I'm a complete beginner in SQL so I can't even use the right words to find anything on google.
Short version:
Using MS SQL Server 2005, how can I check against the dates, then return a result based on whether new rows were created within the last 12 hours, and use that result to decide whether or not to send email?
Something like this should do what you wish.
Select ID
from TableName
where CreatedDate >= dateadd(hour,-12,getDate())
Hope this is clear but please feel free to pose further questions.
Cheers, John
Say your date field in the table is 'CreateDate' and it's of type DateTime.
Your time to compare with is: GETDATE()
(which returns date + time)
To get the datetime value of 12 hours before that, is done using DATEADD:
DATEADD(hour, -12, GETDATE())
so if we want the # of rows added in the last 12 hours, we'll do:
SELECT COUNT(*)
FROM Table
WHERE CreateDate >= DATEADD(hour, -12, GETDATE())
in your proc, you've to store the result of this query into a variable and check if it's > 0, so:
DECLARE #amount int
SELECT #amount=COUNT(*)
FROM Table
WHERE CreateDate >= DATEADD(hour, -12, GETDATE())
and then you'll check the #amount variable if it's > 0.
You could use a trigger, this link has several examples: http://msdn.microsoft.com/en-us/library/aa258254(SQL.80).aspx
USE pubs
IF EXISTS (SELECT name FROM sysobjects
WHERE name = 'reminder' AND type = 'TR')
DROP TRIGGER reminder
GO
CREATE TRIGGER reminder
ON titles
FOR INSERT, UPDATE, DELETE
AS
EXEC master..xp_sendmail 'MaryM',
'Don''t forget to print a report for the distributors.'
GO
If you do not want something for each insert/update, you could copy data to a another table then examine that table every 12 hours, report on the rows in it, then delete them...
assuming you have on this table :
- either a unique id autoincrementing
- either a created_timestamp field containing the timestamp of creation of the row
-> have a new table
reported_rows
- report_timestamp
- last_id_seen
(OR)
- last_timestamp_seen
fill the reported row each time you send your email with the actual value
and before sending the email, check with the previous values, so you know what rows have been added
If the table has an identity field, you could also save the max value (as a bookmark) and next time check if there are any rows with an ID greater than your saved bookmark. May be faster if the key is the clustered key.