mysql> show schemas; +--------------------+ | Database | +--------------------+ | information_schema | | innodb | | mysql | | performance_schema | +--------------------+ 4 rows in set (0.00 sec)
mysql> drop schema innodb; ERROR 1010 (HY000): Error dropping database (can't rmdir './innodb/', errno: 17)
This is an additional schema that is included in an AWS RDS installation. You should not put directories in the MySQL data directory.
Skewness measures the asymmetry of a distribution. A perfectly symmetric distribution has a skewness of zero. A positive skew (right-skewed) means the tail extends to the right — a small number of high values pull the mean above the median.
The vsql-ai extension adds AI prompt capabilities and text embeddings directly in SQL queries, with support for Anthropic Claude , Google Gemini , OpenAI ChatGPT , or a local LLM such as Ollama .
The Chi-Squared test is one of the most widely used statistical tests for categorical data. It comes in two flavors: the goodness-of-fit test asks whether an observed frequency distribution matches an expected one, while the test of independence asks whether two categorical variables are associated with each other.
