CODEWITHSUNDEEP
sqlsql-serversql-server-2008loopsiteration
Piyush
Piyush

Reputation: 886

Iterate through rows and insert data in temp table - SQL Server 2008

I have some data as follows

Duration        Start Date
==========================
2               11/11/2014
1               11/6/2014
3               11/22/2014

I want to iterate to all the above three rows and produce an output as follows

Date
===========
11/11/2014
11/12/2014
11/6/2014
11/22/2014
11/23/2014
11/24/2014

Take the start date increment the date by duration and create separate rows for each dates

Upvotes: 1

Views: 1957

Answers (1)

Tim Schmelter
Tim Schmelter

Reputation: 460288

Don't iterate but use set based approaches like ...

WITH Nums AS(
    SELECT DISTINCT Value = number 
    FROM master..[spt_values] 
)
SELECT Date = DATEADD(d, n.Value - 1, t.[Start Date])
FROM Nums n CROSS JOIN TableName t
WHERE n.Value BETWEEN 1 AND t.Duration

Demo

Note that this approach works only until 2,164. Another approach is to use a number-table. Read:

http://sqlperformance.com/2013/01/t-sql-queries/generate-a-set-1

If you want to insert it into another table you can use it in this way:

WITH Nums AS(
    SELECT DISTINCT Value = number 
    FROM master..[spt_values] 
)
INSERT INTO #TempTable ([Date]) 
SELECT Date = DATEADD(d, n.Value - 1, t.[Start Date])
FROM Nums n CROSS JOIN TableName t
WHERE n.Value BETWEEN 1 AND t.Duration

Upvotes: 5

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