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 11298
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 do you need to create a separate admins.php entry file?
2018-01-15 15:15:36 0 1 1564
MySQL error using DISTINCT query and ORDER BY
2024-03-31 10:27:16 0 1 513
Course Introduction：The DISTINCT keyword is used to remove duplicate rows from MySQL query results, leaving only unique values. Its usage includes: DISTINCT column_name: Remove duplicate values from the specified column. DISTINCT(column_name1, column_name2, ...): Remove duplicate values from a combination of multiple columns.
2024-04-26 comment 0 1146
Course Introduction：Tables may contain duplicate values. This is not a problem, but sometimes you may want to just list distinct values. The keyword distinct is used to return uniquely distinct values.
2016-12-13 comment 0 2775
Course Introduction：distinct() command: distinct function: deduplication application scenario: when statistical type, status, and distinction are required. Example: mysql>selectcount(distinct(name))/count(*)fromt_base_user;+---------------------------------- -+|count(distinct(name))/count(*)|+--------------------------------+ |0.6667|+--------------------------------
2023-05-27 comment 0 1084
