Using BIT or BOOLEAN flags in MariaDB can lead to performance and maintenance issues in certain scenarios. Here are some reasons why you should be cautious when using these data types: Instead of using BIT […]
Understanding Hints and Costs in PostgreSQL Query Optimization Firstly, hints and costs are two important concepts in PostgreSQL query optimization. They help improve query performance by giving the optimizer additional information about how to execute […]
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 […]
If you’ve ever encountered the PostgreSQL column limit of 1,664 columns per table, you know it can be a real hurdle when designing wide tables. This limit is enforced by the internal MaxTupleAttributeNumber parameter. In […]
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 […]
The SQL parser in PostgreSQL is implemented using a combination of lexical analysis, syntax analysis, semantic analysis, and code generation. The parser first converts the input SQL text into tokens, and then performs syntax and […]
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