PostgreSQL Performance

While default values in PostgreSQL can be convenient and provide initial values for columns, certain default values can have a detrimental impact on PostgreSQL performance. Here are some examples of potentially deadly default values and […]

Understanding Query Transformation in PostgreSQL CBO Query transformation plays a crucial role in the PostgreSQL Cost-Based Optimizer (CBO). It enables the optimizer to modify a user’s SQL query to generate a more efficient query plan. […]

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 […]