CODEWITHSUNDEEP
sqlsql-server
Ibanez1408
Ibanez1408

Reputation: 5058

Loop through sql server table using values derived from temp table

I need to use values derived from a temporary table and use it as where criteria. Please see my code:

declare @laneNum int
declare @startDate date = '2019-02-07'
declare @class int = 1
declare @id int 

if OBJECT_ID('tempdb..#tempLaneNumber') IS NOT NULL
drop table [#tempLaneNumber]

create table #tempLaneNumber
(
    LANE_NUMBER INT NULL
)


INSERT INTO #tempLaneNumber (LANE_NUMBER)
SELECT DISTINCT EXIT_LANE
FROM [dbo].[TOLL] 
ORDER BY EXIT_LANE ASC

select * from #tempLaneNumber

set @laneNum = (select * from #tempLaneNumber)

begin
    select COUNT(*)
    from [dbo].[TOLL]
    where convert(date, TRXN_DTIME) = @startDate and EXIT_LANE = @laneNum
end

If I run up to select * from #tempLaneNumber I get this result:

enter image description here

But if I use this values as a criteria on a where statement, on the begin statement, I don't get my expected result.

Upvotes: 1

Views: 43

Answers (1)

PSK
PSK

Reputation: 17943

You need to change your query like following.

select l.LANE_NUMBER, COUNT(*)
    from [dbo].[TOLL] t
    inner join  #tempLaneNumber l on t.EXIT_LANE = l.LANE_NUMBER
    where convert(date, TRXN_DTIME) = @startDate 
    GROUP BY l.LANE_NUMBER

There are multiple issues in your query, i have commented those and modified where ever required.

--declare @laneNum int [NOT REQUIRED]
declare @startDate date = '2019-02-07'
declare @class int = 1
declare @id int 

if OBJECT_ID('tempdb..#tempLaneNumber') IS NOT NULL
drop table [#tempLaneNumber]

create table #tempLaneNumber
(
    LANE_NUMBER INT NULL
)


INSERT INTO #tempLaneNumber (LANE_NUMBER)
SELECT DISTINCT EXIT_LANE
FROM [dbo].[TOLL] 
--ORDER BY EXIT_LANE ASC [NOT REQUIRED FOR INSERT]

select * from #tempLaneNumber

--set @laneNum = (select * from #tempLaneNumber) [YOU CAN'T ASSING A TABLE OUTPUT TO A INT VARIABLE]

--begin [NOT REQUIRED]
/*
    select COUNT(*)
    from [dbo].[TOLL]
    where convert(date, TRXN_DTIME) = @startDate and EXIT_LANE = @laneNum
*/
--CHANGED
select l.LANE_NUMBER, COUNT(*)
    from [dbo].[TOLL] t
    inner join  #tempLaneNumber l on t.EXIT_LANE = l.LANE_NUMBER
    where convert(date, TRXN_DTIME) = @startDate 
    GROUP BY l.LANE_NUMBER
--end [NOT REQUIRED]

Upvotes: 1

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