PostgreSQL

In PostgreSQL, you can actively use the Median Absolute Deviation (MAD) to identify outliers in a dataset. Since MAD is a robust statistic, it measures variability more effectively than traditional metrics. Moreover, it remains less […]

In PostgreSQL, you can apply the isnumeric function to identify strings that PostgreSQL can treat as numbers. The isnumeric function returns TRUE if all characters in the string are numeric, and FALSE otherwise. Here is an […]

The IF [NOT] EXISTS DDL clause is a useful feature in PostgreSQL that can help prevent errors during object creation and removal. This clause allows database administrators to specify whether or not to create or […]

Index wildcard is a technique used in PostgreSQL to create an index on a partial string in a column, rather than indexing the entire column. This technique can improve query performance when searching for data […]

Clustered and non-clustered indexes are important database indexing techniques used in PostgreSQL to improve the performance of SQL queries. In this answer, we will explain the implementation of clustered and non-clustered indexes in PostgreSQL, provide […]

Parameterized queries and bind parameters are important concepts in PostgreSQL (and other database systems) that can help improve performance, security, and maintainability of SQL queries. Parameterized queries are SQL queries where placeholders are used for […]