What does PARTITION BY 1 mean?

PARTITION BY 1 means that a table or view is being partitioned by the value of the first column in the SELECT statement. This is a common technique used in database management to improve the performance of queries that involve grouping or sorting data based on the values in one column.

For example, if you have a table that stores sales data for different products, you might use PARTITION BY 1 to partition the table by product ID. This would allow you to efficiently query the table to find the total sales for a particular product, without having to scan through the entire table.

The PARTITION BY clause can also be used with other types of queries, such as those that involve grouping or sorting data based on the values in multiple columns. This can be useful in situations where you need to optimize the performance of a query that involves multiple columns, but you only want to consider the values in one column when partitioning the data.

Overall, PARTITION BY 1 is a powerful tool for optimizing the performance of queries in a database, and it can help you to improve the performance of your applications by allowing you to focus on the specific data that you need to query.