I vaguely remember using a case clause in a select statement in a former occupation, but now that I am using mysql (with php) I am encountering my first need for it and don't know if I can do what I want. I need to add a sequencing field to my query results based upon whether...
SELECT @level AS 'Customer Level'; In this tutorial, we have shown you how to use two forms of the MySQL CASE statements including simple CASE statement and searched CASE statement. Related Tutorials# MySQL IF Statement 分类: A5. MySQL SQL篇 0 0 « 上一篇: A2-03-04.DDL-MySQL Primar...
...student m where m.id = 1; [Err] 1064 - You have an error in your SQL syntax; 描述: delete from table 这样的句子中 3.9K30 MySQL中CASE的使用 使用演示样例: mysql> select id,name, (gender) as ‘性别’ from t_user; +—-+———+——+ | id | name | 性别 |...| 1 | |...
问MySQL Case语句，在‘Statement List’(语句列表)中返回多个行( Then...)EN需求： 同时：中文名重...
The CASE statement cannot have an ELSE NULL clause, and it is terminated with END CASE instead of END. For the first syntax, case_value is an expression. This value is compared to the when_value expression in each WHEN clause until one of them is equal. When an equal when_value is ...
1topics: #CASE的两种基本用法2CASE OPERATOR3CASE STATEMENT45MariaDB [mysql]> helpcasestatement; #case的第一种用法6Name: 'CASE STATEMENT'7Description:8Syntax:9CASE case_value10WHEN when_value THEN statement_list11[WHEN when_value THEN statement_list] ...12[ELSE statement_list]13END CASE1415Or...
For instance, let’s say we want to calculate a bonus for each student based on their GPA. We can use a CASE statement to determine the bonus percentage and then multiply it by a base amount: SELECTname,CASEWHENgpa>=3.5THEN0.1*1000WHENgpa>=3.0THEN0.05*1000ELSE0ENDASbonusFROMStudent;+-...
This example shows how `CASE` can be used in an `UPDATE` statement to set the `salary_category` field based on different salary ranges. Tips and Best Practices Ensure completeness.Always include an `ELSE` clause to handle unexpected or null cases, enhancing query robustness. ...
Description: When using a subquery with a case when in the update statement, the updated data does not match the expected results returned by the subquery. How to repeat: 1、prepare data: drop database if exists select_test; create database if not exists select_test; create table if not ...
1 row in set (0.00 sec) I'd hardly call mysql a newbie to MySQL, but I just don't get this. If anyone can shed a light on this, please do. With kind regards, D. P.S.: I checked all queries on both cli and MySQL Workbench. ...