Pagination over join table rows - sql

Question

I have a SQL server request with several tables, for example:
Workorder
WorkorderOccurrence
Schedule
A workorder occurrence is a realisation of a specific schedled workorder
For workorder 1 scheduled every day I have:
Workorder occurrence 1_1 the first day
Workorder occurrence 1_2 the second day
For a workorder 2 scheduled every week I have:
Workorder occurrence 1_7
Workorder occurrence 2_1
Workorder occurence 1_8
And so ...
I have a pagination on the front for an agenda view, but the pagination must be done on workorder and not on the occurrence.
Consequently I would like to return the workorder occurrences (maybe 50, 100, 200,).
but on the 20 workorder request by the pagination. But it seems to eeturn the 20 workorder occurrence with the offset and I don't know how to do this.
Below my attempt:
CREATE FUNCTION [dbo].[FctGetWorkorderAgenda]
(
#SeverityIDsFilter NVARCHAR(MAX) = '',
#Culture NVARCHAR(MAX) = 'FR-fr',
#StartDate DATETIMEOFFSET(7),
#EndDate DATETIMEOFFSET(7),
#PageNumber INT = 0,
#ResultByPage INT = 50
)
RETURNS #resTable TABLE
(
[WorkorderID] INT NOT NULL,
[EndDate] DATETIMEOFFSET(0),
[Name] NVARCHAR(MAX),
[FixedNextDate] DATETIMEOFFSET(0),
[NextDate] DATETIMEOFFSET(0),
[WorkorderStatutType] SMALLINT NOT NULL,
[FrequenceType] SMALLINT NOT NULL,
[DayOfWeek] INT,
[DayOfMonth] INT,
[MonthType] INT,
[DayOfMonthType] INT,
[FrequencyTime] TIME(7) NOT NULL,
[FrequencyOffset] INT,
[VendorName] NVARCHAR(MAX) NOT NULL,
[EquipmentName] NVARCHAR(MAX) NOT NULL,
[OrganizationID] INT NOT NULL,
[WorkorderSeverity] INT NOT NULL,
[FullCount] INT NOT NULL
)
AS
BEGIN
INSERT INTO #resTableBooking (
WO.WorkorderID,
WO.EndDate,
WO.Name,
WOO.FixedNextDate,
WOO.NextDate,
WOO.WorkorderStatutType,
S.FrequenceType,
S.DayOfWeek,
S.DayOfMonth,
S.MonthType,
S.DayOfMonthType,
[FrequencyTime],
S.FrequencyOffset,
[EquipmentName],
[WorkorderSeverity],
[FullCount])
SELECT
WorkorderID,
EndDate,
Name,
FixedNextDate,
NextDate,
WorkorderStatutType,
FrequenceType,
DayOfWeek,
DayOfMonth,
MonthType,
DayOfMonthType,
FrequencyTime,
FrequencyOffset,
EquipmentName,
WorkorderSeverity,
FullCount
FROM (
SELECT
WO.WorkorderID,
WO.EndDate,
WO.Name,
WOO.FixedNextDate,
WOO.NextDate,
WOO.WorkorderStatutType,
S.FrequenceType,
S.DayOfWeek,
S.DayOfMonth,
S.MonthType,
S.DayOfMonthType,
S.Time AS FrequencyTime,
S.FrequencyOffset,
E.Name AS EquipmentName,
(
CASE
WHEN (WO.EndDate IS NOT NULL AND (WO.EndDate <= WO.CreatedDate OR WO.NextDate >= WO.EndDate))
THEN -5 -- WorkorderSeverity.Closed
WHEN (WO.NextDate <= WO.CreatedDate)
THEN -4 -- WorkorderSeverity.DeadlineLate
WHEN (S.FrequenceType = 3) -- FrequencyType.EveryMonth
THEN IIF(
DATEADD(day, -7, WO.NextDate) <= WO.CreatedDate,
-3 /* WorkorderSeverity.DeadlineWarning */,
-2 /* WorkorderSeverity.InTime */
)
WHEN (S.FrequenceType = 1 OR S.FrequenceType = 6)
THEN IIF(
DATEADD(month, -1, WO.NextDate) <= WO.CreatedDate,
-3 /* WorkorderSeverity.DeadlineWarning */,
-2 /* WorkorderSeverity.InTime */
)
WHEN (S.FrequenceType = 0) -- FrequencyType.None
THEN CASE
WHEN (WO.NextDate <= WO.CreatedDate) THEN -4 /* WorkorderSeverity.DeadlineLate */
WHEN (DATEADD(day, -3, WO.NextDate) <= WO.CreatedDate) THEN -3
ELSE -2
END
ELSE -2
END
) AS WorkorderSeverity,
COUNT(WO.WorkorderID) OVER() FullCount
FROM [dbo].[WorkorderOccurrence] WOO WITH(NOLOCK)
JOIN [dbo].[Workorder] WO WITH(NOLOCK) ON WO.WorkorderID = WOO.WorkorderID
JOIN [dbo].[Schedule] S WITH(NOLOCK) ON S.ScheduleID = WO.WorkorderScheduleID
JOIN [dbo].[Equipment] E WITH(NOLOCK) ON E.EquipmentID = WO.EquipmentID
LEFT JOIN dbo.Localization l WITH(NOLOCK) ON l.CultureKey = E.CultureKey AND l.CultureName = #culture
WHERE (WOO.FixedNextDate IS NOT NULL AND WOO.FixedNextDate BETWEEN #StartDate AND #EndDate
OR WOO.NextDate IS NOT NULL AND WOO.NextDate BETWEEN #StartDate AND #EndDate)
GROUP BY WO.WorkorderID, WO.EndDate, WO.Name, WO.CreatedDate, WO.NextDate,
WOO.NextDate, WOO.FixedNextDate, WOO.WorkorderOccurrenceID, WOO.WorkorderStatutType,
S.FrequenceType, S.DayOfWeek, S.DayOfMonth, S.MonthType, S.DayOfMonthType, S.Time, S.FrequencyOffset,
E.Name
) AS base
LEFT JOIN
(
SELECT [value]
FROM STRING_SPLIT(#SeverityIDsFilter, ';')
) AS DynamicSeverityFilter ON WorkorderSeverity = DynamicSeverityFilter.[value]
WHERE ((DynamicSeverityFilter.[value] IS NULL AND #SeverityIDsFilter = '') OR DynamicSeverityFilter.[value] IS NOT NULL)
ORDER BY base.WorkorderID, base.NextDate
OFFSET (#PageNumber * #ResultByPage) ROWS
FETCH NEXT #ResultByPage ROWS ONLY
RETURN
END

Answer 1

I think the "easiest" is to make this a two-step solution.
Fetch head data first into a table variable and use the offset thingy.
Join the head data with the row data and select "out" it together.
Simplified version of your function (but i also think you should convert it to regular procedure)
CREATE FUNCTION [dbo].[FctGetWorkorderAgenda]
(
#SeverityIDsFilter NVARCHAR(MAX) = '',
#Culture NVARCHAR(MAX) = 'FR-fr',
#StartDate DATETIMEOFFSET(7),
#EndDate DATETIMEOFFSET(7),
#PageNumber INT = 0,
#ResultByPage INT = 50
)
RETURNS #resTable TABLE
(
[WorkorderID] INT NOT NULL,
...
)
AS
BEGIN
-- Get data by filter
declare #head TABLE (workorderID INT)
insert into #head (workOrderID)
select wo.workorderID
from Workorder wo
... needed joins
where <your filters>
ORDER BY ...
OFFSET (#PageNumber * #ResultByPage) ROWS
FETCH NEXT #ResultByPage ROWS ONLY
-- Return joined data to the client
insert into #resTableBooking (
WO.WorkorderID,
...
)
SELECT WorkorderID
, ...
FROM #head h
inner join rest...
...
ORDER BY ...
RETURN
END