Course Intermediate 11248
Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.
Course Advanced 17582
Course Introduction："Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.
Course Advanced 11296
Course Introduction："Brothers Band Front-end Example Display Video Tutorial" introduces examples of HTML5 and CSS3 technologies to everyone, so that everyone can become more proficient in using HTML5 and CSS3.
Why does TIMESTAMPDIFF always return null?
2023-09-11 23:45:20 0 1 683
Course Introduction：Use MySQL's TIMESTAMPDIFF function to calculate the difference between two timestamps. When developing web applications or database applications, we often use MySQL to store and process time-related data. Calculating the difference between two timestamps is a requirement that is often encountered. MySQL provides the TIMESTAMPDIFF function to easily calculate the difference between two timestamps. The syntax of the TIMESTAMPDIFF function is as follows: TIMESTAMPDIFF
2023-07-25 comment 0 1936
Course Introduction：The timestampdiff function is used to calculate the difference in days between two date times, calculate the difference in hours between two date times, and use column names for calculations. Just specify the time unit to be calculated and then provide the start and end datetime values. This function is very useful for scenarios where date and time difference calculations need to be performed in SQL queries.
2023-12-01 comment 0 3098
