COMPUTER SCIENCE AND ENGINEERING
SQL
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
ON
|
|
|
FOR
|
|
|
OVER
|
|
|
WINDOW
|
Detailed explanation-1: -PostgreSQL window function syntax The OVER() clause defines the window size. If it’s empty and PARTITION BY and ORDER BY are omitted, it means the window is across the whole table. However, PARTITION BY partitions the window by the column(s) that follow the clause.
Detailed explanation-2: -The OVER clause in MySQL is used with the PARTITION BY clause to break the data into partitions. Following is the syntax of the OVER clause in MySQL. The specified function is going to operate for each partition.
Detailed explanation-3: -A window function computes a value for each row in the window. PARTITION BY expr list PARTITION BY is an optional clause that subdivides the data into partitions. Including the partition clause divides the query result set into partitions, and the window function is applied to each partition separately.
Detailed explanation-4: -Partition By: This divides the rows or query result set into small partitions. Order By: This arranges the rows in ascending or descending order for the partition window. The default order is ascending.