Microsoft SQL Server: Create Serial Number Per Day

Question

I have been instructed to create an increasing serial number per day for the project. To do this, you need to create several processes (theoretically on several machines). It ends like

[date]_[number]

as

20101215_00000001
20101215_00000002
...
20101216_00000001
20101216_00000002
...

Since I am using SQL Server (2008) in this project, I tried to do this using T-SQL / SQL magic. This is where I am now:

I created a table containing a serial number like this:

CREATE TABLE [dbo].[SequenceTable](
    [SequenceId] [bigint] IDENTITY(1,1) NOT NULL,
    [SequenceDate] [date] NOT NULL,
    [SequenceNumber] [int] NULL
) ON [PRIMARY]

My naive solution is still a trigger after insertion that sets SequenceNumber:

CREATE TRIGGER [dbo].[GenerateMessageId]
ON  [dbo].[SequenceTable] 
AFTER INSERT
AS 
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

-- The ID of the record we just inserted
DECLARE @InsertedId bigint;
SET @InsertedId = (SELECT SequenceId FROM Inserted)

-- The next SequenceNumber that we're adding to the new record
DECLARE @SequenceNumber int;
SET @SequenceNumber = (
    SELECT SequenceNumber FROM
    (
        SELECT SequenceId, ROW_NUMBER() OVER(PARTITION BY SequenceDate ORDER BY SequenceDate ASC) AS SequenceNumber
        FROM SequenceTable
    ) tmp
    WHERE SequenceId = @InsertedId
)

-- Update the record and set the SequenceNumber
UPDATE 
    SequenceTable
SET 
    SequenceTable.SequenceNumber = ''+@SequenceNumber
FROM
    SequenceTable
INNER JOIN
    inserted ON SequenceTable.SequenceId = inserted.SequenceId
END

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, , SQL , , , - . ?

Answer 1

SequenceTable. : . , .

, :

CREATE TABLE [dbo].[SomeTable] (
    [SequenceId] [bigint] IDENTITY(1,1) NOT NULL,
    [SequenceDate] [date] NOT NULL,
    [SequenceNumber] AS (CAST(SequenceDate AS VARCHAR(10)) + '_' + RIGHT('0000000000' + CAST(SequenceID AS VARCHAR(10)), 10)) PERSISTED
) ON [PRIMARY]

- - .

, - . : ...

:

CREATE FUNCTION dbo.GetNextSequence (
    @sequenceDate DATE,
    @sequenceId BIGINT
) RETURNS VARCHAR(17)
AS
BEGIN
    DECLARE @date VARCHAR(8)
    SET @date = CONVERT(VARCHAR, @sequenceDate, 112)

    DECLARE @number BIGINT
    SELECT
        @number = COALESCE(MAX(aux.SequenceId) - MIN(aux.SequenceId) + 2, 1)
    FROM
        SomeTable aux
    WHERE
        aux.SequenceDate = @sequenceDate
        AND aux.SequenceId < @sequenceId

    DECLARE @result VARCHAR(17)
    SET @result = @date + '_' + RIGHT('00000000' + CAST(@number AS VARCHAR(8)), 8)
    RETURN @result
END
GO

CREATE TABLE [dbo].[SomeTable] (
    [SequenceId] [bigint] IDENTITY(1,1) NOT NULL,
    [SequenceDate] [date] NOT NULL,
    [SequenceNumber] AS (dbo.GetNextSequence(SequenceDate, SequenceId))
) ON [PRIMARY]
GO

INSERT INTO SomeTable(SequenceDate) values ('2010-12-14')
INSERT INTO SomeTable(SequenceDate) values ('2010-12-15')
INSERT INTO SomeTable(SequenceDate) values ('2010-12-15')
INSERT INTO SomeTable(SequenceDate) values ('2010-12-15')
GO

SELECT * FROM SomeTable
GO

SequenceId           SequenceDate SequenceNumber
-------------------- ------------ -----------------
1                    2010-12-14   20101214_00000001
2                    2010-12-15   20101215_00000001
3                    2010-12-15   20101215_00000002
4                    2010-12-15   20101215_00000003

(4 row(s) affected)

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Answer 2

, . , ( / /, ):

create table dbo.TFake (
    T1ID int IDENTITY(1,1) not null,
    T1Date datetime not null,
    Val1 varchar(20) not null,
    constraint PK_T1ID PRIMARY KEY (T1ID)
)
go
create view dbo.T
with schemabinding
as
    select
        T1Date,
        CONVERT(char(8),T1Date,112) + '_' + RIGHT('00000000' + CONVERT(varchar(8),ROW_NUMBER() OVER (PARTITION BY CONVERT(char(8),T1Date,112) ORDER BY T1ID)),8) as T_ID,
        Val1
    from
        dbo.TFake
go
insert into T(T1Date,Val1)
select '20101201','ABC' union all
select '20101201','DEF' union all
select '20101202','GHI'
go
select * from T

:

T1Date  T_ID    Val1
2010-12-01 00:00:00.000 20101201_00000001   ABC
2010-12-01 00:00:00.000 20101201_00000002   DEF
2010-12-02 00:00:00.000 20101202_00000001   GHI

---

CURRENT_TIMESTAMP.

Answer 3

-

CREATE TABLE SequenceTableStorage (
    SequenceId bigint identity not null,
    SequenceDate date NOT NULL,
    OtherCol int NOT NULL,
)

CREATE VIEW SequenceTable AS
SELECT x.SequenceDate, (CAST(SequenceDate AS VARCHAR(10)) + '_' + RIGHT('0000000000' + CAST(SequenceID - (SELECT min(SequenceId) + 1 FROM SequenceTableStorage y WHERE y.SequenceDate = x.SequenceDate) AS VARCHAR(10)), 10)) AS SequenceNumber, OtherCol
  FROM SequenceTableStorage x

SequenceDate SequenceId, , .

Edit:

, , ( ).

, .

CREATE VIEW SequenceTable AS
SELECT SequenceDate, (CAST(SequenceDate AS VARCHAR(10)) + '_' + RIGHT('0000000000' + row_number() OVER(PARTITION BY SequenceDate ORDER BY SequenceId)
  FROM SequenceTableStorage

, , .

Answer 4

;

CREATE FUNCTION [dbo].[GetSessionSeqCode]()
RETURNS VARCHAR(15) 
AS
BEGIN
DECLARE @Count INT;
DECLARE @SeqNo VARCHAR(15)

SELECT @Count = ISNULL(COUNT(SessionCode),0)
FROM UserSessionLog
WHERE SUBSTRING(SessionCode,0,9) =  CONVERT(VARCHAR(8), GETDATE(), 112)

SET @SeqNo =  CONVERT(VARCHAR(8), GETDATE(), 112) +'-' + FORMAT(@Count+1,'D3');

RETURN @SeqNo
END

: '20170822-001' "20170822-002" , '20170822-003'

Answer 5

If you are not opposed to a number not starting with one, you can use DATEDIFF(dd, 0, GETDATE())which is the number of days from 1-1-1900. It will increase every day.