Is there any difference in how I edit the GROUP BY command?
my code:
SELECT Number, Id
FROM Table
WHERE(....)
GROUP BY Id, Number
is it faster if i edit it like this:
SELECT Number, Id
FROM Table
WHERE(....)
GROUP BY Number , Id
it's better to use DISTINCT if you don't want to aggregate data. Otherwise, there is no difference between the two queries you provided, it'll produce the same query plan
This examples are equal.
DDL:
CREATE TABLE dbo.[WorkOut]
(
[WorkOutID] [bigint] IDENTITY(1,1) NOT NULL PRIMARY KEY,
[TimeSheetDate] [datetime] NOT NULL,
[DateOut] [datetime] NOT NULL,
[EmployeeID] [int] NOT NULL,
[IsMainWorkPlace] [bit] NOT NULL,
[DepartmentUID] [uniqueidentifier] NOT NULL,
[WorkPlaceUID] [uniqueidentifier] NULL,
[TeamUID] [uniqueidentifier] NULL,
[WorkShiftCD] [nvarchar](10) NULL,
[WorkHours] [real] NULL,
[AbsenceCode] [varchar](25) NULL,
[PaymentType] [char](2) NULL,
[CategoryID] [int] NULL
)
Query:
SELECT wo.WorkOutID, wo.TimeSheetDate
FROM dbo.WorkOut wo
GROUP BY wo.WorkOutID, wo.TimeSheetDate
SELECT DISTINCT wo.WorkOutID, wo.TimeSheetDate
FROM dbo.WorkOut wo
SELECT wo.DateOut, wo.EmployeeID
FROM dbo.WorkOut wo
GROUP BY wo.DateOut, wo.EmployeeID
SELECT DISTINCT wo.DateOut, wo.EmployeeID
FROM dbo.WorkOut wo
Execution plan:
Related
I have 2 table called tblSetting and tblPaquets.
I need to update 3 fields of tblPaquets from tblSetting base on a where clause that use a datetime field of tblPaquest and tblSetting.
The sql below is to represent what I am trying to do and I know it make no sense right now.
My Goal is to have One query to achieve this goal.
I need to extract the data from tblSettings like this
SELECT TOP(1) [SupplierID],[MillID],[GradeFamilyID] FROM [tblSettings]
WHERE [DateHeure] <= [tblPaquets].[DateHeure]
ORDER BY [DateHeure] DESC
And Update tblPaquets with this data
UPDATE [tblPaquets]
SET( [SupplierID] = PREVIOUS_SELECT.[SupplierID]
[MillID] = PREVIOUS_SELECT.[MillID]
[GradeFamilly] = PREVIOUS_SELECT.[GradeFamilyID] )
Here the table design
CREATE TABLE [tblSettings](
[ID] [int] NOT NULL,
[SupplierID] [int] NOT NULL,
[MillID] [int] NOT NULL,
[GradeID] [int] NOT NULL,
[TypeID] [int] NOT NULL,
[GradeFamilyID] [int] NOT NULL,
[DateHeure] [datetime] NOT NULL,
[PeakWetEnable] [tinyint] NULL)
CREATE TABLE [tblPaquets](
[ID] [int] IDENTITY(1,1) NOT NULL,
[PaquetID] [int] NOT NULL,
[DateHeure] [datetime] NULL,
[BarreCode] [int] NULL,
[Grade] [tinyint] NULL,
[SupplierID] [int] NULL,
[MillID] [int] NULL,
[AutologSort] [tinyint] NULL,
[GradeFamilly] [int] NULL)
You can do this using CROSS APPLY:
UPDATE p
SET SupplierID = s.SupplierID,
MillID = s.MillID
GradeFamilly = s.GradeFamilyID
FROM tblPaquets p CROSS APPLY
(SELECT TOP (1) s.*
FROM tblSettings s
WHERE s.DateHeure <= p.DateHeure
ORDER BY p.DateHeure DESC
) s;
Notes:
There are no parentheses before SET.
I don't recommend using [ and ] to escape identifiers, unless they need to be escaped.
I presume the query on tblSettings should have an ORDER BY to get the most recent rows.
I have created two database tables named TSALESFACT and DimDate. TSALESFACT table contains the monthly sales target values. And DimTime contains the date values which begins from 01/01/2005.
CREATE TABLE [dbo].[TSalesFact](
[DateID] [smalldatetime] NULL,
[YearID] [int] NOT NULL,
[MonthID] [int] NOT NULL,
[SeasonID] [char](10) NOT NULL,
[DepartmentID] [char](10) NOT NULL,
[SalesAmount] [int] NOT NULL
)
CREATE TABLE [dbo].[dim_Date](
[ID] [int] NOT NULL,
[Date] [datetime] NOT NULL,
[Day] [char](2) NOT NULL,
[DaySuffix] [varchar](4) NOT NULL,
[DayOfWeek] [varchar](9) NOT NULL,
[DOWInMonth] [tinyint] NOT NULL,
[DayOfYear] [int] NOT NULL,
[WeekOfYear] [tinyint] NOT NULL,
[WeekOfMonth] [tinyint] NOT NULL,
[Month] [char](2) NOT NULL,
[MonthName] [varchar](9) NOT NULL,
[Quarter] [tinyint] NOT NULL,
[QuarterName] [varchar](6) NOT NULL,
[Year] [char](4) NOT NULL,
[StandardDate] [varchar](10) NULL,
[HolidayText] [varchar](50) NULL)
I would like to INSERT these sales target values into a new table named DailySalesTargets. But, the main purpose of this operation is writing the target sales to the each of end of month date. All of the date values for the relevant month will be zero. My desired resultset for this operation is like below:
How can I achieve this? Any idea?
I think this is what you are trying to do.
insert into [DailySalesTargets]([DateID],[YearID],[MonthID],
[SeasonID],[DepartmentID],[SalesAmount])
select d.[Date],d.[Year],d.[Month]
,dptSeason.[SeasonID],dptSeason.[DepartmentID]
,case when EOMONTH(d.[Date])=s.[DateID] then s.[SalesAmount] else 0 end as [SalesAmount]
from [dbo].[dim_Date] d
cross join (select distinct [DepartmentID],[SeasonID] from [dbo].[TSalesFact]) dptSeason
left join [dbo].[TSalesFact] s on d.[Date] = s.[DateID]
and s.[DepartmentID]=dptSeason.[DepartmentID]
and s.[SeasonID]=dptSeason.[SeasonID]
I have a requirement to design a table that is going to have around 80 million records. I created a partition for every month using persisted column (if its wrong suggest me the best way). Please find below scripts that I used to create tables and partition and the query that's going to be used often. Only Insertion and deletion will be done on this table.
-- Create the Partition Function
CREATE PARTITION FUNCTION PF_Invoice_item (int)
AS RANGE LEFT FOR VALUES (1,2,3,4,5,6,7,8,9,10,11,12);
-- Create the Partition Scheme
CREATE PARTITION SCHEME PS_Invoice_item
AS PARTITION PF_Invoice_item ALL TO ([Primary]);
CREATE TABLE [Invoice]
(
[invoice_id] [bigint] NOT NULL,
[Invoice_Number] [varchar](255) NULL,
[Invoice_Date] [date] NULL,
[Invoice_Total] [numeric](18, 2) NULL,
[Outstanding_Balance] [decimal](18, 2) NULL,
CONSTRAINT [PK_Invoice_id] PRIMARY KEY CLUSTERED([invoice_id] ASC)
)
CREATE TABLE [InvoiceItem](
[invoice_item_id] [bigint] NOT NULL,
[invoice_id] [bigint] NOT NULL,
[invoice_Date] [date] NULL,
[make] [varchar](255) NULL,
[serial_number] [varchar](255) NULL,
[asset_id] [varchar](100) NULL,
[application] [varchar](255) NULL,
[customer] [varchar](255) NULL,
[ucid] [varchar](255) NULL,
[dcn] [varchar](255) NULL,
[dcn_name] [varchar](255) NULL,
[device_serial_number] [varchar](255) NULL,
[subscription_name] [varchar](255) NULL,
[product_name] [varchar](255) NULL,
[subscription_start_date] [date] NULL,
[subscription_end_date] [date] NULL,
[duration] [varchar](50) NULL,
[promo_name] [varchar](255) NULL,
[promo_end_date] [date] NULL,
[discount] [decimal](18, 2) NULL,
[tax] [decimal](18, 2) NULL,
[line_item_total] [decimal](18, 2) NULL,
[mth] AS (datepart(month,[invoice_date])) PERSISTED NOT NULL,**
[RELATED_PRODUCT_RATEPLAN_NAME] [varchar](250) NULL,
[SUB_TOTAL] [decimal](18, 2) NULL,
[BILLING_START_DATE] [date] NULL,`enter code here`
[BILLING_END_DATE] [date] NULL,
[SUBSCRIPTION_ID] [varchar](200) NULL,
[DEVICE_TYPE] [varchar](200) NULL,
[BASE_OR_PROMO] [varchar](200) NULL,
CONSTRAINT [PK_InvoiceItem_ID] PRIMARY KEY CLUSTERED ([invoice_item_id]
ASC,[mth] ASC))
ON PS_Invoice_item(mth);
GO
ALTER TABLE [InvoiceItem] WITH CHECK ADD CONSTRAINT [FK_Invoice_ID]
FOREIGN KEY([invoice_id])
REFERENCES [Invoice] ([invoice_id])
GO
I will be using below queries
select subscription_name,duration,start_date,end_date,promotion_name,
promotion_end_date,sub_total,discount,tax,line_item_total from InvoiceItem
lt inner join Invoice on lt.invoice_id=invoice.invoice_id where
invoice.invoice_number='' and lt.customer='' and lt.ucid='' lt.make='' and
lt.SERIAL_NUMBER='' and lt.dcn='' and lt.application=''
select customer,make,application from billing.AssetApplicationTotals
lineItem inner join billing.Invoice invoice on
lineItem.invoice_id=invoice.invoice_id where invoice.invoice_number='';
SELECT [invoice_Date],[make],[serial_number],[application],[customer],
[ucid],[dcn],[dcn_name],[device_serial_number]
,[subscription_name],[product_name],[subscription_start_date],
[subscription_end_date],[duration],[promo_name],[promo_end_date]
FROM [InvoiceItem] where [application]=''
SELECT [invoice_Date],[make],[serial_number],[application],[customer],
[ucid],[dcn],[dcn_name],[device_serial_number]
,[subscription_name],[product_name],[subscription_start_date],
[subscription_end_date],[duration],[promo_name],[promo_end_date]
FROM [InvoiceItem] where [customer]=''
What is the best way to create index? Shall I create separate non clustered index for each filter, or shall I have Composite index and shall I have covering index to avoid key lookup?
This is my query which takes about 1.5 seconds. Can I lower this?
SELECT *
FROM
(SELECT
ROW_NUMBER() OVER (ORDER BY NAME asc) peta_rn,
peta_query.*
FROM
(SELECT
BOOK, PAGETRIMMED, NAME, TYPE, PDF
FROM
CCWiseDocumentNames2 cdn
INNER JOIN
CCWiseInstr2 cwi ON cwi.ID = cdn.ID) as peta_query) peta_paged
WHERE
peta_rn > 1331900 AND peta_rn <= 1331950
These are my table structures:
CREATE TABLE [dbo].[CCWiseDocumentNames2](
[ID] [int] NULL,
[BK_PG] [varchar](50) NULL,
[NAME] [varchar](100) NULL,
[OTHERNAM] [varchar](100) NULL,
[TYPE] [varchar](50) NULL,
[INDEXNAME] [varchar](50) NULL
) ON [PRIMARY]
CREATE TABLE [dbo].[CCWiseInstr2](
[ID] [int] NULL,
[BK_PG] [varchar](50) NULL,
[DATE] [datetime] NULL,
[ITYPE] [varchar](50) NULL,
[BOOK] [int] NULL,
[PAGE] [varchar](50) NULL,
[NOBP] [varchar](50) NULL,
[DESC] [varchar](240) NULL,
[TIF] [varchar](50) NULL,
[INDEXNAME] [varchar](50) NULL,
[CONFIRM] [varchar](50) NULL,
[PDF] [varchar](50) NULL,
[PAGETRIMMED] [varchar](10) NULL,
[PageINT] [int] NULL,
[PageCHAR] [varchar](2) NULL,
[IdAuto] [int] NOT NULL
) ON [PRIMARY]
This is my execution plan:
As you can see it is 97% clustered index seek and 3% index scan. Any way to improve this query further?
You can't add rownumber on the fly to more than a million rows and expect a where clause will instantly recognize those rows with the newly generated rownumbers.
Because I don't have that volume of data, can only provide some options for your consideration:
Dedicate the clustered index for Name column (other than ID)
Make the join after you get row_number over name.
Include the three columns from CCWiseInstr2 into a non-clustered index on ID column. This could save some hard disk spindle's movement. Perfomance gain could only be observed with large volume of data.
CREATE NONCLUSTERED INDEX [idx2_ID_include] ON [dbo].[CCWiseInstr2] ([ID] ASC) INCLUDE ( [BOOK], [PDF], [PAGETRIMMED])
GO
With a as (
Select *
from ( SELECT ROW_NUMBER() OVER (ORDER BY NAME asc) as peta_rn, ID,
type
from CCWiseDocumentNames2) as Temp
where peta_rn > 1331900 AND peta_rn <= 1331950
)
select a.peta_rn,
a.type,
b.book,
b.PAGETRIMMED,
b.PDF
from a
join CCWiseInstr2 as b on a.id = b.id
Subject table
CREATE TABLE [dbo].[BS_Subject](
[SubjectID] [bigint] IDENTITY(1,1) NOT NULL,
[DepartmentID] [bigint] NOT NULL,
[SubjectName] [varchar](50) NOT NULL,
[SubjectDescription] [varchar](100) NULL,
[SubjectShortCode] [varchar](10) NOT NULL,
CONSTRAINT [PK_Subject] PRIMARY KEY CLUSTERED
(
[SubjectID] ASC
)
SubjectToClass table
CREATE TABLE [dbo].[BS_SubjectToClass](
[SubjectToClassID] [bigint] IDENTITY(1,1) NOT NULL,
[SubjectID] [bigint] NOT NULL,
[ClassID] [bigint] NOT NULL,
CONSTRAINT [PK_BS_SubjectToClass] PRIMARY KEY CLUSTERED
(
[SubjectToClassID] ASC
)
I need list all the rows in the Subject table where subjectid is not in SubjectToClass table of a specified class.
I have this but unable to go any further
select Distinct(BS_Subject.SubjectID) DepartmentID,
SubjectName, SubjectDescription, SubjectShortCode
from dbo.BS_Subject
where BS_Subject.SubjectID <> (
SELECT Distinct(BS_Subject.SubjectID)
FROM dbo.BS_Subject, dbo.BS_SubjectToClass
Where BS_Subject.SubjectID = BS_SubjectToClass.SubjectID
And BS_SubjectToClass.ClassID = 2)
SELECT SubjectID, DepartmentID, SubjectName, SubjectDescription, SubjectShortCode
FROM BS_Subject
WHERE NOT EXISTS
(SELECT SubjectToClassID FROM BS_SubjectToClass WHERE
BS_Subject.SubjectID = BS_SubjectToClass.SubjectID
AND BS_SubjectToClass.ClassID =2)
You need to use the NOT IN operator - not the <> (that's VB or something....)
SELECT
DISTINCT(BS_Subject.SubjectID) DepartmentID,
SubjectName, SubjectDescription, SubjectShortCode
FROM dbo.BS_Subject
WHERE
BS_Subject.SubjectID NOT IN
(SELECT DISTINCT(BS_Subject.SubjectID)
FROM dbo.BS_Subject, dbo.BS_SubjectToClass
WHERE BS_Subject.SubjectID = BS_SubjectToClass.SubjectID
AND BS_SubjectToClass.ClassID = 2)