SQL Learning Hub

Learn SQL with structured, practical tutorials.

From fundamentals to advanced topics, explore concise lessons designed for real-world implementation.

DATEDIFF function

In SQL, DATEDIFF function is used to find the difference between two dates.

CAST function

In SQL, CAST function is used to convert a value from one data type to another data type.

TRY_CAST function

In SQL, TRY_CAST function is used to convert a value from one data type to another data type and handle errors by returning NULL if a cast operation fails.

CONVERT function

In SQL, CONVERT function is used to convert a value from one data type to another data type.

TRY_CONVERT function

In SQL, TRY_CONVERT function is used to convert a value from one data type to another data type and handle errors by returning NULL if a cast operation fails.

ISNULL function

In SQL, ISNULL function is used to replace NULL values with a specified alternative value.

NULLIF function

In SQL, the NULLIF function is used to replace an expression with NULL if expression matches a specified value.

COALESCE function

In SQL, the COALESCE function is used to return the first non-null expression/value in a list of expressions/values.

SQL Window functions

In the realm of SQL data analysis, window functions have emerged as powerful tools for manipulating and aggregating data within a dataset. While traditional aggrega…

ROW_NUMBER function

In SQL, the ROW_NUMBER function is used to assign a unique sequential integer to each row in the result set according to the specified criteria in ORDER BY clause.