SELECT statement in FROM clause - syntax help

Hi,
I want to have a SELECT statement in the FROM clause. I get syntax error when doing this and since I am new to ABAP I need som help.
I want to do the following, (and if anyone has any SELECT statement from their own system which you know there is no syntax error in please post it here so I can analyze the syntax):
*I leave the INTO itab clause out, since I only want to demonstrate the functionality
I am trying to get.
SELECT tableOne~someField
FROM tab AS tableOne (SELECT someField
FROM tab
WHERE someFiled > 1) AS tableTwo
WHERE tableOnesomeField > tableTwosomeField
like I said, the problem is that the select statement in the parenthesis in the from clause seems to be incorrect because I get "wrong expression" when trying to compile. Is this because I cannot have a select statement in the from clause or is it because of a minor syntax error, such as I forgot a dot, or some other sign?
thanks and regards
Baran

sorry i am not enough familiar with sub queries but some error i can see which i will state here.
1> you have to use sub queries i.e. select in ( ) after where clause because here you are fulfilling a where clause by another select statement.
like this
SELECT * FROM SFLIGHT
INTO WA
WHERE SEATSOCC = ( SELECT MAX( SEATSOCC ) FROM SFLIGHT ).
2> you cannot specify field name without into clause either you have to use
select * or select f1 into tab-f1 like this...
but if you are using select * without into you have to define
tables : dbtab.
selec * from dbtab. like that.
regards
shiba dutta

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How many entries do you have in internal table "run_doc_xref"?
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I need to coerce column outputs to strings in a SELECT statement. Here is a pseudo example:
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Pls. mark points for helpful answers

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>
sree jith wrote:
> What can be the issue in this case? Why first execution takes longer time?..
> Sreejith A P
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>
sree jith wrote:
> Or is there any way to modify the Select statemnt to get better performance.
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