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In general Oracle's Cost Based Optimizer will merge queries containing views (or in-line views in your case, which is essentially the same thing) as part of the query transformation phase of the optimisation. This is known as "view merging", and will transform your second query into the first query. In some cases full view merging cannot be performed but even then "predicate pushing" might be allowed and performance will improve as a result. <a href="http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/optimops.htm#i37745" rel="nofollow noreferrer">http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/optimops.htm#i37745</a> also see: <a href="http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/optimops.htm#i37745" rel="nofollow noreferrer">http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/optimops.htm#i37745</a> <a href="http://www.oracle.com/pls/db102/to_URL?remark=ranked&urlname=http:%2F%2Fdownload.oracle.com%2Fdocs%2Fcd%2FB19306_01%2Fserver.102%2Fb14200%2Fsql_elements006.htm%23SQLRF50908" rel="nofollow noreferrer">http://www.oracle.com/pls/db102/to_URL?remark=ranked&urlname=http:%2F%2Fdownload.oracle.com%2Fdocs%2Fcd%2FB19306_01%2Fserver.102%2Fb14200%2Fsql_elements006.htm%23SQLRF50908</a> <a href="http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams142.htm#REFRN10141" rel="nofollow noreferrer">http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams142.htm#REFRN10141</a> <a href="http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/sql_elements006.htm#SQLRF50706" rel="nofollow noreferrer">http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/sql_elements006.htm#SQLRF50706</a> Long story short, you should not have a problem here.
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1. POSubselects in Oracle Query
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1. USDavid Aldridge
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1. POSubselects in Oracle Query
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Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.