ELSE -- Statements to execute if none of the above conditions are TRUE END IF; -- Other statements END// DELIMITER ; ``` **示例**: 创建一个简单的存储过程,根据输入的分数返回等级: ```sql DELIMITER // CREATE PROCEDURE getGrade(IN score INT, OUT grade CHAR(1)) BEGIN IF score >= 90...
In these examples, we decide as per the conditions. For example, if I get a bonus then only I will go for an international vacation else I will go for domestic vacations. We need to incorporate these conditions-based decisions in programming logic as well. SQL Server provides the capability...
问使用嵌套的if-else简化本机SQL查询的构造EN我有一个用于构建原生sql查询的方法。我有4个字符串生成器...
m.ForeignLang is not met, no record in Table_B with the same key as in A has the wanted language. You can't then redecide to want another language, that's not possible as a SQL construct. In general your conditions and field names or expressions in the field list always will be ev...
SQL 中 IF 语句的用法在SQL中,IF语句通常用于条件判断和流程控制。不过需要注意的是,标准的SQL(如ANSI SQL)并不直接支持像编程语言中的那种完整的IF...ELSE结构来进行流程控制。然而,许多数据库管理系统(DBMS),比如MySQL、Microsoft SQL Server和PostgreSQL等,都提供了各自的扩展或替代方法来实现类似的功能。以下...
';ELSEPRINT'Failed, Try again '; In this example, student marks 91% satisfy the conditions for both SQL IF statements, and it prints a message for both SQL IF statements. 在此示例中,学生分数91%满足两个SQL IF语句的条件,并且为两个SQL IF语句打印一条消息。
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Impose les conditions d'exécution d'une instruction Transact-SQL. Instruction Transact-SQL qui suit unIFmot clé et sa condition est exécutée si la condition est satisfaite : l’expression booléenne retourneTRUE. Le mot clé facultatifELSEintroduit une autre instruction Transact-SQL exécutée...
'||CURRENT_VALUE;ENDIF;ELSECONDITIONS :=CONDITIONS||' = '||ALIAS||'.'||CURRENT_VALUE||' ';ENDIF;--循环值减1SIGNS :=SIGNS-1;ENDLOOP;--拼接关联SQLTARGET_RESULTS :=TARGET_RESULTS||'LEFT JOIN (SELECT DISTINCT '||QUERY_ITEMS||','||TEMP.QUERY_CONTENT||' AS A'||TEMP.ID||' FROM ...
You can use these conditions to perform different actions for different decisions.C has the following conditional statements:Use if to specify a block of code to be executed, if a specified condition is true Use else to specify a block of code to be executed, if the same condition is false...