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Essential SQL Functions for Data Manipulation Date and Time Functions DATE_FORMAT The DATE_FORMAT function allows you to display date/time values in different formats. -- Function: DATE_FORMAT SELECT DATE_FORMAT(CURRENT_TIMESTAMP(), "%Y-%m-%d %H:%i:%s") AS formatted_time, DATE_FORMAT(creation_date, "%m - %w") AS formatted_date FROM em ...

MySQL provides several functions for implementing conditional logic in queries, including CASE, IF, IFNULL, and ELT functions. Sample table structure: +----+-----------+-----+-------+--------+ | id | name | sex | level | weight | +----+-----------+-----+-------+--------+ | 1 | xiaohong | 1 | 1 | 50 | | 2 | xiaoming | 0 | 0 ...