In this tutorial, we aim at understanding how to use theCASE WHENstatement in a MySQL database. Businesses and organizations dealing with large amounts of data need to filter the data based on certain conditions
SELECT CASE WHEN condition THEN column1 WHEN another_condition THEN column2 ELSE column3ENDAS new_column_name FROM table_name; Mysql 其中,选择的列的信息需要通过CASE语句来进行选择和拼接,AS关键字后的名称为新列的名字。 示例 我们来看一个例子,假设我们有一个名为students的表,表中包含以下几列信息:...
2. Multiple Conditions SELECTemployee_name,CASEWHENsalary>50000THEN'High Salary'WHENsalaryBETWEEN30000AND50000THEN'Medium Salary'ELSE'Low Salary'ENDASsalary_categoryFROMemployees; In this query, the `CASE` expression categorizes employees into salary bands, offering more granular control over output label...
It is not clear to me if the same feature is provided with MySQL's 'case' statement. CASE N WHEN 1 THEN SELECT "One" WHEN 2 WHEN 3 THEN SELECT "Two or Three" ELSE SELECT "The number is outside range" CASE END; This gives a SQL syntax error. ...
使用foreachENcase when then 的基本用法 SELECT CASE WHEN b.is_leave = 0 THEN '在职' WHEN ...
I'm assuming the multiple case . . . when statements are the culprit. Honestly, I was surprised that it even worked in the first place. Is there a better way to selectively join the data I need in the left joined table than using case whens? Maybe some more advanced sub_queries?
type_1=np.select(conditions,choices,default='C')score_type_1numpy select方法类似case when语法，...
标签: MySQL 收藏 Summary: in this tutorial, we will give you some hints so that you can choose between IF and CASE statement in stored procedures. MySQL provides both IF and CASE statements to enable you to execute a block of SQL code based on certain conditions, which is known as flow...
分析： 1，变量控制 这个很简单，在线程执行进入的时候，写控制变量running = true。线程将要退出的时候...
No fallthrough. The closest you will get is... SET @n=3; SELECT CASE WHEN @n=1 THEN "One" WHEN @n=2 OR @n=3 THEN "Two or Three" ELSE "N is out of range" END; PB http://www.artfulsoftware.comNavigate: Previous Message• Next Message Options: Reply• Quote ...