You will understand the concept of using scalar functions and aggregate functions in string and numeric operations in SQL databases, Understand the concept of using GROUP BY in grouping data, ...

The error “Column is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause” occurs in SQL when a SELECT ...

Learn about the supported aggregate functions in TiDB. /docs/dev/functions-and-operators/aggregate-group-by-functions/ /docs/dev/reference/sql/functions-and-operators ...