How to Retrieve the Top 1 Row in Oracle?

Retrieving the Top 1 Row in Oracle

The question seeks to determine how to retrieve the top 1 row based on a specific criterion in Oracle 11g. The following approaches can be employed:

Using ROWNUM:

If you wish to retrieve only the first selected row, you can employ the ROWNUM column:

<code class="sql">select fname from MyTbl where rownum = 1;</code>

This query retrieves the firstName (fname) value from the MyTbl table and limits the result to the first row.

Using Analytic Functions:

Alternatively, you can use analytic functions to rank and retrieve the top row(s). The following query utilizes the RANK() function:

<code class="sql">select max(fname) over (rank() order by some_factor) from MyTbl;</code>

This query ranks the rows based on the some_factor column and retrieves the maximum fname value from the top row.

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