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Editorial Team
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Asked: 2026-05-25T17:27:58+00:00

I used to write select clause in side select clause to avoid joins in

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I used to write select clause in side select clause to avoid joins in from clause. But I am afraid that is it a good coading practice or it will degrade database performance. Below is the query which contains multiple tables but I have written it using nested select clause without any join statement. Please let me know if I am making any mistake or it is ok. At this moment, I am getting accurate result.

SELECT * ,
       (select POrderNo from PurchaseOrderMST POM 
        where POM.POrderID=CET.POrderID)as POrderNo,
       (select SiteName from SiteTRS ST where ST.SiteID=CET.SiteID)as SiteName,
       (select ParticularName from ParticularMST PM where   
        PM.ParticularID=CET.ParticularID)as ParticulerName  
FROM ClaimExpenseTRS CET
WHERE ClaimID=@ClaimID
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1 Answer

  1. Editorial Team

    I’d use joins for this because it is best practice to do so and will be better for the query optimizer.

    But for the learning just try to execute the script with join and without and see what happens on the query plan and the execution time. Usually this answers your questions right away.

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