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The MySQL LAST_VALUE window function is used to retrieve the value of an expression from the last row within a specified window frame. The window frame is a group of rows that are considered together for calculations. The LAST_VALUE function is particularly useful for analyzing trends and identifying patterns in data. Syntax The general syntax […]
The MySQL FIRST_VALUE function is a window function that allows you to retrieve the first value in an ordered set of rows within a partition. This function is often used in conjunction with the OVER clause to define the window frame for the operation. Syntax Here is the basic syntax of the FIRST_VALUE function: FIRST_VALUE(expression) […]
The MySQL RANK function is used to assign a rank to each row within the result set of a query based on the values of one or more columns. It is commonly used in scenarios where you want to determine the rank of each row relative to others, such as in competitions, rankings, or leaderboards. […]
The MySQL DENSE_RANK function is used to assign a unique rank to each distinct row within a result set based on the specified column or columns. Unlike the RANK function, DENSE_RANK does not leave gaps in the ranking when there are ties. If two or more rows have the same values for the ordering columns, […]
The MySQL CUME_DIST function is used to calculate the cumulative distribution of a set of values within a group of rows. It represents the relative position of a specified value within the group, considering the sorted order of the values. The result is a value between 0 and 1, indicating the cumulative distribution of the […]
In MySQL, the IS NOT NULL comparison function is used to filter and retrieve records from a database where a specific column does not contain NULL values. NULL is a special marker used in databases to represent the absence of data in a particular field. The IS NOT NULL condition is often used in conjunction […]
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