WHEN search_condition THEN statement_list [WHEN search_condition THEN statement_list] ... [ELSE statement_list] END CASE 注意: 这两种语法是有区别的,区别如下: 1:第一种语法:case_value必须是一个表达式,例如 userid%2=1或者username is null等。该种语法不能用于测试NULL。 2:第二种语法CASE后面不...
IN条件用于检查一个值是否在一组值中。在CASE WHEN语句中,可以将IN条件作为评估条件之一。例如: sql CASE WHEN some_column IN (value1, value2, ...) THEN result ... END 3. 包含一个CASE WHEN和IN条件的MySQL查询示例 假设有一个名为employees的表,包含以下列:id、name、department和salary。现在,我们...
附mybatis: SELECT * FROM dfs_work_order main_table RIGHT JOIN ( SELECT * from ( SELECT work_order_id, state_change_time, start_date, actual_end_date, case when (line_id is not null ) and state = 3 then 1 when (line_id is not null ) and state = 4 then 2 when (line_id ...
if if(value,value2,value3),如果value结果为true(一般为表达式),返回value2,否则value3 case when 方式1(相当Java的if..else if.. else) case when 条件1 then 结果1 when 条件2 then 结果2
UPDATE person SET `status` = CASE id WHEN 1 THEN 1 WHEN 2 THEN 0 WHEN 3 THEN 0 WHEN 4 THEN 1 END WHERE id IN (1, 2, 3, 4) 注意事项:一定要有WHERE id IN的限制,否则不在WHEN中的记录就会被置为NULL Case搜索函数 代码语言:javascript 复制 UPDATE person SET `status` = CASE WHEN id...
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when col_1 in ('a') then '第二类' else'其他' end 1. 2. 3. 4. 下面我们来看一下,使用Case函数都能做些什么事情。 一. 已知数据按照另外一种方式进行分组 分析,有如下数据:(为了看得更清楚,我并没有使用国家代码,而是直接用国家名作为主键:Primary Key) ...
Case When help Posted by:Tim O'Neill Date: July 24, 2021 03:49PM Hi all, I have the below code using case when. I'd like to modify this though so that instead of the code using 1 for true it counts the distinct number of records that match the criteria in each case when ...
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Bug #111301The query results in the CASE WHEN statement are inconsistent. Submitted:6 Jun 2023 14:44Modified:7 Jun 2023 12:55 Reporter:Chi ZhangEmail Updates: Status:Not a BugImpact on me: None Category:MySQL ServerSeverity:S3 (Non-critical) ...