Updating a table using a scalar subselect


18-Aug-2016 06:18

The ORDER BY clause requests sorting for the results of a query.

When the ORDER BY clause is missing, the result rows from a query have no defined order (they are unordered).

(See the following Restrictions item.) For example, the following query finds all the employees with salaries that are higher than average for their department.You can divide noncorrelated subqueries into the following three categories, depending on the number of rows and columns returned in their result set: Depending on the category, different sets of operators may be employed by the containing SQL statement to interact with the subquery.



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