What is the case-switch statement in SQL? How to use a case-when statement in a mysql stored procedure? Question: To automatically set the session_id with the request_time parameter, I chose to use a mysql stored procedure that has a case statement. Here is the implementation. create proc...
[ELSE statement_list] END CASE;案例根据传入的月份,判定月份所属的季节(要求采用case结构)。1-3月份,为第一季度 4-6月份,为第二季度 7-9月份,为第三季度 10-12月份,为第四季度create procedure p(in month int) begin declare result varchar(10); case when month >= 1 and month <= 3 then set...
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 ...
Summary: in this tutorial, you will learn how to use MySQL CASE statements to construct complex conditional statements inside stored programs. Besides the IF statement, MySQL provides an alternative conditional statement called the CASEstatement. The CASE statement makes the code more readable and ...
Summary: in this tutorial, you will learn how to use MySQL CASE statements to construct complex conditionals. Besides the IF statement, MySQL also provides an alternative conditional statement called MySQL CASE. The MySQL CASE statement makes the code more readable and efficient. There are two ...
Mysql中的条件语句if、case Mysql中的条件语句在我们对数据进行转换的时候比较有用,这样就不需要创建中转表。...= "" IF ELSE 流程控制语句在mysql存储过程中的用法: IF search_condition THEN statement_list [ELSEIF search_condition...[ELSE statement_list] END IF IF作为一条语句,在END IF后需要加上分号...
1回答 如何在mySQL中将IF语句放在Case表达式中?我正在做一个家庭作业问题,我必须在case语句中放一个IF语句。我在网上找不到任何解释如何做到这一点的东西。我想我有错误的语法。vendor_state, vendor_city into v_state, v_city /*Start a CASE statement using the sta ...
For the first syntax,case_valueis an expression. This value is compared to thewhen_valueexpression in eachWHENclause until one of them is equal. When an equalwhen_valueis found, the correspondingTHENclausestatement_listexecutes. If nowhen_valueis equal, theELSEclausestatement_listexecutes, if th...
Statement is incomplete, expecting END delimiter is not valid at this position, expecting CREATE 我知道MySQL Workbench脚本编辑器在我单击应用时会自动应用分隔符代码,因此不接受手动提供DELIMITER $$。但由于这个原因,当我尝试使用;分隔符和ENDCASE/IF时,我得到了这个由statement is incomplete语法错误组成的无限循...
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. ...