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Editorial Team
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Asked: 2026-06-11T17:24:11+00:00

I have seen one sql query, which is like, SELECT B.SubscriptionID FROM tblA A1

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I have seen one sql query, which is like,

SELECT B.SubscriptionID
FROM 
 tblA A1
inner JOIN  tblA A2 ON A1.AcctServiceID = A2.AcctServiceID  
INNER JOIN  tblB B ON A2.ServiceID = B.ServiceID
INNER JOIN  tblC C ON B.SubscriptionID = C.SubscriptionID 
WHERE
    A1.ServiceID = 1302
AND (C.Type LIKE '%O%' OR C.Type LIKE '%A%')

Can any one explain what is the use of 

 tblA A1
    inner JOIN  tblA A2 ON A1.AcctServiceID = A2.AcctServiceID

and can we optimize above query? Please sugget me how to optimize the above query.

Please help me…
Thanks.

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1 Answer

  1. Editorial Team
     inner JOIN  tblA A2 ON A1.AcctServiceID = A2.AcctServiceID

    This line means you join tblA as A1 with the tblA as A2, and show line when AcctServiceID from tblA as A1 is the same as AcctServiceID from tblA as A2..
    The way to optimize this query is remove this line, becouse don’t do anything. AcctServiceID aways be the same as AcctSerivceID becouse is the same field.

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