Tag Archives: order by and distinct clause

Oracle sql: order by and distinct clause

In this section of Oracle sql,we will discuss about order by and distinct clause Define a null value: If a column in a table has no assigned value , then the column is said to be null for that row. A null is a value that is unavailable,unassigned ,unknown. A null is not same as zero or space. Zero is a number and space is … Continue reading Oracle sql: order by and distinct clause »