If theexprevaluates toTRUEi.e.,expris notNULLandexpris not 0, theIFfunction returns theif_true_expr, otherwise, it returnsif_false_exprTheIFfunction returns a numeric or a string, depending on how it is used. Th
If theexprevaluates toTRUEi.e.,expris notNULLandexpris not 0, theIFfunction returns theif_true_expr, otherwise it returnsif_false_expr. TheIFfunction return a numeric or a string, depending on how it is used. Please be careful not to confuse theIFfunction with theIF statement. MySQL IF...
MySQL条件判断IF,CASE,IFNULL语句详解 1.IF语句的基本用法 IF(condition, true_statement, false_statement); condition: 条件表达式...true_statement: 如果条件为真,则执行的语句。 false_statement: 如果条件为假,则执行的语句。...ELSE result: 如果没有匹配的条件,则返回result。...'订单类型2' WHEN catego...
There is also an IF() function, which differs from the IF statement described here. See Section 12.5, “Flow Control Functions”. The IF statement can have THEN, ELSE, and ELSEIF clauses, and it is terminated with END IF. If a given search_condition evaluates to true, the corresponding...
There is also an IF() function, which differs from the IF statement described here. See Section 14.5, “Flow Control Functions”. The IF statement can have THEN, ELSE, and ELSEIF clauses, and it is terminated with END IF. If a given search_condition evaluates to true, the corresponding...
END IF 1. 2. 3. 4. 5. 6. 当IF中条件search_condition成立时,执行THEN后的statement_list语句,否则判断ELSEIF中的条件,成立则执行其后的statement_list语句,否则继续判断其他分支。当所有分支的条件均不成立时,执行ELSE分支。search_condition是一个条件表达式,可以由“=、<、<=、>、>=、!=”等条件运算符...
Statement_list END LOOP [ end_label ] LEAVE 语句主要用于跳出循环控制。语法形式如下: LEAVE label 如: DELIMITER && CREATE PROCEDURE pro_user7(IN totalNum INT) BEGIN aaa:LOOP SET totalNum=totalNum-1; IF totalNum=0 THEN LEAVE aaa ;
在这个示例中,我们使用了CASE语句来代替IF函数,这通常可以提供更好的性能。 参考链接 MySQL IF Function MySQL CASE Statement 通过以上信息,你应该能够理解MySQL中IF函数的基础概念、优势、类型、应用场景以及如何解决可能遇到的问题。 相关搜索: mysql 里写判断语句 ...
IF(expr1,expr2,expr3)当expr1为1/true时,则返回expr2,否则返回expr3 topics:CREATEDATABASECREATEEVENTDROPDATABASEDROPEVENTDROPSERVERDROPTABLEDROPVIEWIFFUNCTIONIFSTATEMENT IFNULL当expr1为非null时,则返回expr1,否则返回expr2 Syntax: IFNULL(expr1,expr2) ...
MySQLTutorial官网 IF function syntax: IF(expr,if_true_expr,if_false_expr) CASE expression syntax: 1CASEvalue2WHENcompare_value_1THENresult_13WHENcompare_value_2THENresult_24…5ELSEresultEND second form: 1CASE2WHENcondition_1THENresult_13WHENcondition_2THENresult_24…5ELSEresultEND ...